@inproceedings{nelson_2023, title={Addressing Strategic Priorities for Advancing Underrepresented Groups in Fisheries and Natural Resources}, author={Nelson, Stacy A.C.}, year={2023}, month={Aug} }
 @article{jouzi_leung_nelson_2023, title={Characterizing the association between child malnutrition and protected areas in sub-Saharan Africa using unsupervised clustering}, volume={14}, ISSN={2190-6483 2190-6491}, url={http://dx.doi.org/10.1007/s13412-023-00880-3}, DOI={10.1007/s13412-023-00880-3}, number={2}, journal={Journal of Environmental Studies and Sciences}, publisher={Springer Science and Business Media LLC}, author={Jouzi, Zeynab and Leung, Yu-Fai and Nelson, Stacy}, year={2023}, month={Dec}, pages={300–312} }
 @article{vivek nanda_baran_tateosian_nelson_hu_2023, title={Classification of tree forms in aerial LiDAR point clouds using CNN for 3D tree modelling}, volume={44}, ISSN={0143-1161 1366-5901}, url={http://dx.doi.org/10.1080/01431161.2023.2282405}, DOI={10.1080/01431161.2023.2282405}, abstractNote={ABSTRACT Three-dimensional models of trees that correspond to the real-world forms of the trees on the ground are used in urban planning, solar power estimation, and other disciplines. Previous studies have focused on generating 3D tree models from high-density point cloud data such as Terrestrial Laser Scanning (TLS) data, which is expensive and limited to small spatial extents. However, there has been limited exploration of inexpensive solutions to model trees over large spatial extents. The goal of this study is to use widely available discrete return Airborne Laser Scanning (ALS) data along with field-captured tree photographs and Google Street View (GSV) images to develop 3D equivalents of trees over larger spatial extents. To this end, we designed a process to assign representative 3D models for individual trees in discrete return ALS point clouds. This study demonstrates the use of a Convolutional Neural Network (CNN) model and 3D models generated with Structure from Motion (SfM) for the realistic modelling of deciduous non-overlapping trees from discrete return ALS data. We classified and labelled the crown shapes of deciduous trees in a study area into four classes based on GSV images of trees. We delineated and segmented non-overlapping deciduous trees from ALS data and reduced them to 2D images using voxel point counts. Next, we trained a CNN architecture to match the 2D images to the corresponding classes observed from GSV images. For each class, we created a representative 3D tree model using field-captured circumnavigational photos of trees and SfM. To demonstrate 3D visualization using the 3D tree models, we created a 3D visualization of the trees surrounding a parking lot. The trained CNN model from this study can be used to classify non-overlapping deciduous trees from discrete return ALS data and subsequently visualize near-realistic 3D tree models of trees.}, number={22}, journal={International Journal of Remote Sensing}, publisher={Informa UK Limited}, author={Vivek Nanda, Vishnu Mahesh and Baran, Perver and Tateosian, Laura and Nelson, Stacy A. C. and Hu, Jianxin}, year={2023}, month={Nov}, pages={7156–7186} }
 @article{schrum_jameson_tateosian_blank_wegmann_nelson_2023, title={Curvature Weighted Decimation: A Novel, Curvature-Based Approach to Improved Lidar Point Decimation of Terrain Surfaces}, volume={3}, ISSN={2673-7418}, url={http://dx.doi.org/10.3390/geomatics3010015}, DOI={10.3390/geomatics3010015}, abstractNote={Increased availability of QL1/QL2 Lidar terrain data has resulted in large datasets, often including large quantities of redundant points. Because of these large memory requirements, practitioners often use decimation to reduce the number of points used to create models. This paper introduces a novel approach to improve decimation, thereby reducing the total count of ground points in a Lidar dataset while retaining more accuracy than Random Decimation. This reduction improves efficiency of downstream processes while maintaining output quality nearer to the undecimated dataset. Points are selected for retention based on their discrete curvature values computed from the mesh geometry of the TIN model of the points. Points with higher curvature values are preferred for retention in the resulting point cloud. We call this technique Curvature Weighted Decimation (CWD). We implement CWD in a new free, open-source software tool, CogoDN, which is also introduced in this paper. We evaluate the effectiveness of CWD against Random Decimation by comparing the resulting introduced error values for the two kinds of decimation over multiple decimation percentages, multiple statistical types, and multiple terrain types. The results show that CWD reduces introduced error values over Random Decimation when 15 to 50% of the points are retained.}, number={1}, journal={Geomatics}, publisher={MDPI AG}, author={Schrum, Paul T., Jr. and Jameson, Carter D. and Tateosian, Laura G. and Blank, Gary B. and Wegmann, Karl W. and Nelson, Stacy A. C.}, year={2023}, month={Mar}, pages={266–289} }
 @inproceedings{jepleting_schrum_nelson_carr_2023, title={Enhancing Blender as a 3D Data Visualization Tool: Add-On Development and Integration}, author={Jepleting, Joyce and Schrum, Paul and Nelson, Stacy and Carr, Tyrell}, year={2023}, month={Jul} }
 @article{howell_leon_everman_mitasova_nelson_richardson_2023, title={Performance of unoccupied aerial application systems for aquatic weed management: Two novel case studies}, volume={37}, ISSN={0890-037X 1550-2740}, url={http://dx.doi.org/10.1017/wet.2023.32}, DOI={10.1017/wet.2023.32}, abstractNote={AbstractUnoccupied aerial application systems (UAAS) are gaining popularity for weed management to increase applicator safety and to deliver herbicide treatments where treatment sites limit ground-based spray equipment. Several studies have documented UAAS application strategies and procedures for weed control in terrestrial settings, yet literature describing remote spray technology for use in aquatics remains limited. Currently, applicators seek guidance for UAAS deployment for aquatic weed management to overcome site access restrictions, deal with environmental limitations, and improve ground-based applicator safety in hazardous treatment scenarios. In the present case studies, we evaluate a consumer-available UAAS to deliver the herbicide, florpyrauxifen-benzyl, as both foliar and directed in-water spray applications. The first case study showed that the invasive floating-leaved plant, yellow floating heart, was controlled 80% to 99% by 6 wk after treatment (WAT) following UAAS foliar herbicide treatments. The second case study demonstrated that UAAS directed in-water herbicide application reduced variable-leaf watermilfoil visible plant material by 94% at 5 WAT. Likewise, directed in-water applications from UAAS eliminated the need to deploy watercraft, which improved overall operational efficiency. Data from both case studies indicate that UAAS can provide an effective and efficient treatment strategy for floating-leaved and submersed plant control among common herbicide treatment scenarios. Future integration of UAAS in aquatic weed control programs is encouraged, especially among smaller treatment sites (≤4 ha) or where access limits traditional spray operations.}, number={3}, journal={Weed Technology}, publisher={Cambridge University Press (CUP)}, author={Howell, Andrew W. and Leon, Ramon G. and Everman, Wesley J. and Mitasova, Helena and Nelson, Stacy A.C. and Richardson, Robert J.}, year={2023}, month={May}, pages={277–286} }
 @article{reckling_levine_nelson_mitasova_2023, title={Predicting residential septic system malfunctions for targeted drone inspections}, volume={30}, ISSN={2352-9385}, url={http://dx.doi.org/10.1016/j.rsase.2023.100936}, DOI={10.1016/j.rsase.2023.100936}, abstractNote={Septic system malfunctions can cause untreated sewage to pond in yards or contaminate drinking water wells leading to environmental and health problems. While most malfunction detections rely on reports by individuals, machine learning and remote sensing can be used to identify potentially failing systems. We propose a methodology that combines a machine learning technique implemented in Maxent with unmanned aerial system (UAS) mapping to create a priority queue for inspection and detecting malfunctions apparent in the collected imagery. We demonstrate the approach in Wake County, North Carolina, a County with 73,347 septic systems located within drinking water supply watersheds. The predictive modeling identified 102 systems with a 99.9% probability of failure. Four properties from the queue were mapped by UAS and the acquired imagery was visually analyzed in the visible spectrum for signs of malfunction. Our results suggest that the proposed approach can assist in the early identification of failing systems minimizing the environmental impacts and saving resource time and funds.}, journal={Remote Sensing Applications: Society and Environment}, publisher={Elsevier BV}, author={Reckling, William and Levine, Jay and Nelson, Stacy A.C. and Mitasova, Helena}, year={2023}, month={Apr}, pages={100936} }
 @inproceedings{jepkogei_schrum_nelson_carr_hipp_floyd_2023, title={Scrub Typhus Emergence in America}, author={Jepkogei, Ruth and Schrum, Paul and Nelson, Stacy and Carr, Tyrell and Hipp, Aaron and Floyd, Myron}, year={2023}, month={Jul} }
 @article{jouzi_nelson_leung_2023, title={Spatial heterogeneity of child malnutrition, proximity to protected areas and environmental variabilities in Zimbabwe}, volume={88}, ISSN={1572-9893}, url={http://dx.doi.org/10.1007/s10708-023-10842-5}, DOI={10.1007/s10708-023-10842-5}, number={4}, journal={GeoJournal}, publisher={Springer Science and Business Media LLC}, author={Jouzi, Zeynab and Nelson, Stacy A. C. and Leung, Yu-Fai}, year={2023}, month={Feb}, pages={3773–3789} }
 @article{jouzi_leung_nelson_2022, title={Addressing the food security and conservation challenges: Can be aligned instead of apposed?}, volume={3}, ISSN={2673-611X}, url={http://dx.doi.org/10.3389/fcosc.2022.921895}, DOI={10.3389/fcosc.2022.921895}, abstractNote={This perspective article provides an overview of the interaction between food security and conservation as two of the most important challenges of our time. To provide a better understanding of the topic, a conceptual framework for the possible pathways of positive and negative impacts of protected areas (PAs) on four dimensions of food security is proposed. Considering the importance of hunting and shifting agriculture in food security and the challenges caused by them in conservation, the cases of hunting and shifting agriculture were explored. Finally, the rights-based approaches in conservation and food security, as a new approach with the potential to protect people and the planet as a synergistic approach is discussed.}, journal={Frontiers in Conservation Science}, publisher={Frontiers Media SA}, author={Jouzi, Zeynab and Leung, Yu-Fai and Nelson, Stacy}, year={2022}, month={Jul} }
 @inproceedings{macy_nelson_2022, title={Celebration of NC State Sustainability}, author={Macy, Sam and Nelson, Stacy A.C.}, year={2022}, month={Apr} }
 @inproceedings{nelson_leggett_richmond-bryant_2022, title={Connecting Representation Equity and Capacity-building into how we do Research: Creating the WIN-WIN-WIN}, author={Nelson, Stacy A.C. and Leggett, Zakiya H. and Richmond-Bryant, Jennifer}, year={2022}, month={Feb} }
 @misc{belica_castro garrido_petrasova_nelson_2022, title={Exploring a method to estimate real-sky global solar radiation in mountainous areas at high resolutions with an open-source geospatial solar radiation model and GOES-13 geostationary meteorological satellite data.}, url={http://dx.doi.org/10.5194/egusphere-egu22-12493}, DOI={10.5194/egusphere-egu22-12493}, abstractNote={<p>With their complex topography and orographic effects, the amount of solar radiation reaching a surface (insolation) can vary over short distances and time frames in mountainous areas, affecting the spatio-temporal variability of hydrological and ecological processes and contributing to the biodiversity of mountain ecosystems.&#160; The combined effects of variable topography and meteorological conditions on insolation can complicate assessments of how land cover changes affect insolation in mountainous regions as measurement data is often limited to few locations. To incorporate the spatio-temporal variability of sky conditions as well as the spatial variability of terrain in estimates of solar radiation across a montane headwater basin over two summers, we extended an open-source geospatial model of surface solar radiation, r.sun.hourly, to permit the spatially and temporally explicit parameterization of atmospheric conditions at user-specified spatial and temporal resolutions with temporal raster datasets.&#160; Sensitivity analyses indicated that of the three atmospheric parameters in the model, the coefficient of real-sky direct beam solar radiation (coeff_bh) (an index of cloudiness to clear sky conditions) had the greatest influence on insolation estimates for our study area, located in the southern Appalachian Mountains of the southeastern USA, and we developed a workflow for estimating coeff_bh from publicly available geostationary meteorological satellite images (GOES-13, 1 km spatial and 15-minute temporal resolutions). &#160;The extended r.sun.hourly model was parameterized with a bare-earth digital elevation model (1/9 arc-second DEM obtained from the USGS National Map 3-D Elevation Program), the estimated coeff_bh temporal raster datasets (downscaled from 1 km to the DEM resolution), and monthly mean Linke Turbidity values to estimate global solar radiation across the basin at a 15-minute resolution over two summers. &#160;Estimates of instantaneous (15-minute interval) and cumulative total (for 12-hour period bracketing solar noon) global solar radiation were evaluated with pyranometer (Eppley 8-48) measurements of global solar radiation collected by the U.S. Department of Agriculture Forest Service Coweeta Hydrological Laboratory for a total of 144 days (dates with recorded precipitation during daylight hours or incomplete imagery datasets were excluded from analyses). &#160; Despite the low spatial resolution of the satellite images from which the real-sky direct beam radiation coefficient was estimated and the proximity of the ground measurement location to the edges of a GOES-13 cell (< 90 m north and < 230 m east), both instantaneous and daily total estimates of global solar radiation corresponded well with measurements (R<sup>2</sup> = 0.81, p-value < 0.001, n = 7056 and R<sup>2</sup> = 0.89, p-value < 0.001, n = 144). Estimate errors tended to be lower on cloudier days (MAPE = 6.8%, n = 61) than less cloudy days (MAPE = 13.6%, n = 83).&#160; Offsets in the timing and magnitude of peaks and troughs in insolation over time (with passing clouds) between measurements and estimates were also greater during partly cloudy conditions.&#160; Although these findings are for one location, they suggest the potential of the extended r.sun.hourly model to provide high-resolution estimates of solar radiation, over extensive areas and timeframes, in mountainous regions with remotely sensed elevation and meteorological data.</p>}, publisher={Copernicus GmbH}, author={Belica, Laura and Castro Garrido, Manuel and Petrasova, Anna and Nelson, Stacy}, year={2022}, month={Mar} }
 @article{liu_dobbs_caldwell_miniat_sun_duan_nelson_bolstad_carlson_2022, title={Inter‐Basin Transfers Extend the Benefits of Water From Forests to Population Centers Across the Conterminous U.S.}, volume={58}, ISSN={0043-1397 1944-7973}, url={http://dx.doi.org/10.1029/2021WR031537}, DOI={10.1029/2021WR031537}, abstractNote={AbstractClean water from forests is commonly used to supply drinking water to communities both within and outside basin boundaries through inter‐basin transfers (IBTs). Here, we modified the Water Supply Stress Index (WaSSI) model to provide estimates of mean water yield and the proportion of mean flow originating on forested lands at the 12‐Digit Hydrologic Unit Code scale across the conterminous United States (CONUS). We accounted for the benefits of forests for drinking water supply and receiving populations through IBTs by incorporating a new IBT database, surface intake location information for public drinking water systems, and modeled water yield from forests. We compiled the new database of 594 IBTs ranging from 0.01 million m3 yr−1 to 8,900 million m3 yr−1, for a total transferred volume of 116,894 million m3 yr−1. According to our results, forested lands comprised 28.7% of the total land area across CONUS, but contributed 46% of the total surface water yield. Approximately 125.5 million people derived more than 10% of their surface drinking water supply from forested lands, and 83.1 million people received more than 50% of their surface drinking water supply from forested lands. Of those 83.1 million people receiving more than 50% of their surface drinking water supply from forested lands, 19.4 million people obtained some (≥0.01%) of that water through IBTs. We conclude that accounting for IBTs is critical to accurately assess the contribution of forested watersheds for surface drinking water supply. Hydrologic models for assessment and decision making must include IBTs to fully account for the effects of climate change and human population dynamics on water resource availability at watershed to regional scales. Results from this study can aid water resource and forest managers in developing integrated watershed management plans at a time when climate change, population growth, and land use change threaten water supplies.}, number={5}, journal={Water Resources Research}, publisher={American Geophysical Union (AGU)}, author={Liu, Ning and Dobbs, G. Rebecca and Caldwell, Peter V. and Miniat, Chelcy Ford and Sun, Ge and Duan, Kai and Nelson, Stacy A. C. and Bolstad, Paul V. and Carlson, Christopher P.}, year={2022}, month={May} }
 @article{liu_caldwell_dobbs_miniat_bolstad_nelson_sun_2021, title={Forested lands dominate drinking water supply in the conterminous United States}, volume={16}, ISSN={1748-9326}, url={http://dx.doi.org/10.1088/1748-9326/ac09b0}, DOI={10.1088/1748-9326/ac09b0}, abstractNote={Abstract
               Forests provide the most stable and highest quality water supplies among all land uses. Quantitatively evaluating the benefits of forest water supply functions is important to effectively mitigate the impacts of land development, climate change, and population growth. Here, by integrating a water balance model and national drinking water data, we determined the amount of surface water yield originating on different forest ownership types at a fine resolution (88,000 watersheds) and tracked that water through the river network to drinking water intakes and the populations they serve. We found that forested lands comprised 36% of the total land area but contributed 50% of the total surface water yield. Of the 23,983 public surface drinking water intakes depending on surface water sources, 89% (serving around 150 million people) received some (>0.01%) surface water from forested lands, and 38% (serving about 60 million people) received more than 50% of their surface drinking water supply from forested lands. Privately-owned forests were the most important water source in the eastern U.S., benefiting 16 million people, followed by federal forests (14.4% of the total water supply). In contrast, federally-owned forested lands were the dominant water source (52% of the total water supply) in the West. Privately-owned forests are the most vulnerable to future land use change and associated water supply impacts. Continuing programs that support private forest landowners with financial and technical assistance through federal and state forest management agencies and potentially developing payment for ecosystem service schemes could maximize benefits for landowners so they may retain their land assets while minimizing forest loss and associated impacts on critical ecosystem services including the provisioning a clean and reliable water supply for the American public.}, number={8}, journal={Environmental Research Letters}, publisher={IOP Publishing}, author={Liu, Ning and Caldwell, Peter V and Dobbs, G Rebecca and Miniat, Chelcy Ford and Bolstad, Paul V and Nelson, Stacy A C and Sun, Ge}, year={2021}, month={Jul}, pages={084008} }
 @inproceedings{jouzi_leung_nelson_2021, title={Mapping the Associations between Protected Areas and Child Malnutrition}, author={Jouzi, Zeynab and Leung, Yu-Fai and Nelson, Stacy}, year={2021}, month={Apr} }
 @article{takeuchi_koch_nelson_2021, title={Recent Immigrant Insect Fauna—Another Look at a Classic Analysis}, volume={12}, ISSN={2155-7470}, url={http://dx.doi.org/10.1093/jipm/pmab034}, DOI={10.1093/jipm/pmab034}, abstractNote={Abstract
               In 1978, Reece Sailer published a seminal retrospective entitled ‘Our Immigrant Insect Fauna.’ His goals were to better understand the origins and historical patterns of alien insect species introductions into the United States and establish a baseline for future work to improve our ability to respond to environmental and agricultural well-being threats. We updated Sailer’s study to include information on species introduced recently into the United States and that are now targeted by regulatory agencies. The recent trends (recorded through 2016) are different from those reported by Sailer. Asian-origin species are much more important than in 1978 and predominate today. Nevertheless, introductions from all parts of the world have continued. Although the diversity of alien species’ origins has increased through time, there has not been a corresponding change in the rate of introductions of species of phytosanitary importance. This finding is inconsistent with our original assumption of a positive nonlinear relationship with international trade imports. Our findings will assist in identifying and prioritizing potential high-risk plant pests as well as enhancing biosecurity capacities.}, number={1}, journal={Journal of Integrated Pest Management}, publisher={Oxford University Press (OUP)}, author={Takeuchi, Yu and Koch, Frank H and Nelson, Stacy A C}, editor={Green, JodyEditor}, year={2021}, month={Jan} }
 @inbook{nelson_2020, place={Bethesda, Maryland}, title={A lesson from the stream: A personal reflection on understanding the them versus me identity associated with backgrounds, race, training, and talent}, ISBN={978-1-934874-60-8}, booktitle={Lessons in Leadership: Integrating Courage, Vision, and Innovation for the Future of Sustainable Fisheries}, publisher={American Fisheries Society}, author={Nelson, S.A.C.}, editor={Taylor, W.W. and Carlson, A.K. and Bennett, A. and Ferreri, C.P.Editors}, year={2020}, month={Aug}, pages={289–296} }
 @inproceedings{nelson_2020, title={A lesson from the stream: A personal reflection on understanding the them vs. me group identity associated with backgrounds, race, training, and talent}, booktitle={American Fisheries Society Virtual Annual Meeting}, author={Nelson, S.A.C.}, year={2020}, month={Sep} }
 @inproceedings{jouzi_leung_nelson_2020, title={Examining the association of child malnutrition with socio-economic and biophysical factors across scales in Sub-Saharan Africa}, booktitle={2020 American Association of Geographers Annual Meeting}, author={Jouzi, Zeynab and Leung, Yu-Fai and Nelson, Stacy}, year={2020}, month={Apr} }
 @inproceedings{leggett_nichols_megalos_cook_nelson_parajuli_rivers_arenas_2020, title={Forestry of the Future: Improving workforce participation of underrepresented minority populations in forest resources}, booktitle={Virtual Society of American Foresters National Conference}, author={Leggett, Z.H. and Nichols, E.G. and Megalos, M.A. and Cook, S. and Nelson, S.A. and Parajuli, R. and Rivers, L. and Arenas, A.}, year={2020}, month={Oct} }
 @book{caldwell_kennen_hain_nelson_sun_mcnulty_2020, title={Hydrologic modeling for flow-ecology science in the Southeastern United States and Puerto Rico}, url={http://dx.doi.org/10.2737/srs-gtr-246}, DOI={10.2737/srs-gtr-246}, abstractNote={An understanding of the applicability and utility of hydrologic models is critical to support the effective management of water resources throughout the Southeastern United States (SEUS) and Puerto Rico (PR).Hydrologic models have the capacity to provide an estimate of the quantity of available water at ungauged locations (i.e., areas of the country where a U.S. Geological Survey [USGS] continuous record gauge is not installed) and provide the baseline flow information necessary to develop the linkages between water availability and characteristics of streamflow that support ecological communities (i.e., support the development of flow-ecology response models).This report inventories and then directly examines and compares a subset of hydrologic models used to estimate streamflow at a number of gauged basins across the SEUS and PR.This effort was designed to evaluate, quantify, and compare the magnitude of error and to investigate the potential causes of error associated with predicted streamflows from seven hydrologic models of varying complexity and calibration strategy.This was accomplished by computing and then comparing classical hydrologic model fit statistics (e.g., mean bias, coefficient of determination [R 2 ], root mean squared error [RMSE], Nash-Sutcliffe Efficiency [NSE]) and understanding the bias in the prediction in these and a subset of ecologically relevant flow metrics (ERFMs).Additionally, streamflow predictions from a larger regional-scale hydrologic model were compared to those of several fine-scale hydrologic models under a range of hypothetical climate change scenarios to determine the range of predicted streamflow responses to fixed climate perturbations.A pilot study was conducted using predicted streamflow and boosted regression trees to develop a set of predictive flow-ecology response models to assess the potential change in fish species richness in the North Carolina Piedmont under several scenarios of water availability change.This report is intended to provide a general assessment of all the tools and techniques available to support hydrologic modeling for flow-ecology science in the SEUS and PR.It is our hope that the approach used herein to understand differences in streamflow predictions among a subset of hydrologic models that have been applied in the SEUS for developing flow-ecology response models will provide water resource managers and stakeholders with an informed pathway for developing the capacity to link streamflow and ecological response and an understanding of some of the limitations associated with these type of modeling efforts.}, institution={U.S. Department of Agriculture, Forest Service, Southern Research Station}, author={Caldwell, Peter V and Kennen, Jonathan G. and Hain, Ernie F. and Nelson, Stacy A.C. and Sun, Ge and McNulty, Steve G.}, year={2020} }
 @inproceedings{liu_dobbs_caldwell_miniat_bolstad_nelson_sun_2020, title={Interbasin transfers extend the benefits of National Forest System Lands for water supply beyond downstream users}, booktitle={AGU Fall Meeting}, author={Liu, N. and Dobbs, R. and Caldwell, P.V. and Miniat, C.F. and Bolstad, P.V. and Nelson, S.A.C. and Sun, G.}, year={2020}, month={Dec} }
 @book{liu_dobbs_caldwell_miniat_bolstad_nelson_sun_2020, title={Quantifying the role of State and private forest lands in providing surface drinking water supply for the Southern United States}, url={http://dx.doi.org/10.2737/srs-gtr-248}, DOI={10.2737/srs-gtr-248}, institution={U.S. Department of Agriculture, Forest Service, Southern Research Station}, author={Liu, Ning and Dobbs, G. Rebecca and Caldwell, Peter V. and Miniat, Chelcy Ford and Bolstad, Paul V. and Nelson, Stacy and Sun, Ge}, year={2020} }
 @article{jouzi_leung_nelson_2020, title={Terrestrial Protected Areas and Food Security: A Systematic Review of Research Approaches}, volume={7}, url={http://dx.doi.org/10.3390/environments7100083}, DOI={10.3390/environments7100083}, abstractNote={Achieving food security is one of the most important sustainable development goals and is a major global concern, specifically in remote and rural areas of the developing world where high biodiversity can be found and many protected areas are located. The goals of food security and biodiversity conservation are two of the most critical challenges of our time. This study aims to better understand the state of research on protected areas and food security through a methodological lens. The literature search was conducted in the Web of Science core collection and the Centre for Agriculture and Biosciences International (CAB) abstracts database. The search results indicate that this is an understudied topic with only nineteen articles published in various research domains. The findings reveal that studies were explanatory research rather than confirmatory and most studies had a snapshot design with no control or baseline. National parks were the main category of protected areas reported in studies. Data collection commonly employed a combination of qualitative and quantitative methods at a household level. We also found that spatial data and methods are important yet underutilized.}, number={10}, journal={Environments}, publisher={MDPI AG}, author={Jouzi, Zeynab and Leung, Yu-Fai and Nelson, Stacy}, year={2020}, month={Oct}, pages={83} }
 @article{niemuth_ransom_finn_godfrey_nelson_stoskopf_2020, title={Using Random Forest Algorithm to Model Cold-Stunning Events in Sea Turtles in North Carolina}, volume={11}, ISSN={["1944-687X"]}, DOI={10.3996/052019-JFWM-043}, abstractNote={AbstractSea turtle strandings due to cold-stunning are seen when turtles are exposed to ocean temperatures that acutely and persistently drop below approximately 12°C. In North Carolina, this syndrome affects imperiled loggerhead Caretta caretta, green Chelonia mydas, and Kemp's ridley Lepidochelys kempii sea turtle species. Based on oceanic and meteorological patterns of cold-stunning in sea turtles, we hypothesized that we could predict the daily size of cold-stunning events in North Carolina using random forest models. We used cold-stunning data from the North Carolina Sea Turtle Stranding and Salvage Network from 2010 to 2015 and oceanic and meteorological data from the National Data Buoy Center from 2009 to 2015 to create a random forest model that explained 99% of the variance. We explored additional models using the 10 and 20 most important variables or only oceanic and meteorological variables. These models explained similar percentages of variance. The variables most frequently found to be important were related to air temperature, atmospheric pressure, wind direction, and wind speed. Surprisingly, variables associated with water temperature, which is critical from a biological perspective, were not among the most important variables identified. We also included variables for the mean change in these metrics daily from 4 d before the day of stranding. These variables were among the most important in several of our models, especially the change in mean air temperature from 4 d before stranding to the day of stranding. The importance of specific variables from our random forest models can be used to guide the selection of future model predictors to estimate daily size of cold-stunning events. We plan to apply the results of this study to a predictive model that can serve as a warning system and to a downscaled climate projection to determine the potential impact of climate change on cold-stunning event size in the future.}, number={2}, journal={JOURNAL OF FISH AND WILDLIFE MANAGEMENT}, publisher={U.S. Fish and Wildlife Service}, author={Niemuth, Jennifer N. and Ransom, Casey C. and Finn, Sarah A. and Godfrey, Matthew H. and Nelson, Stacy A. C. and Stoskopf, Michael K.}, year={2020}, month={Dec}, pages={531–541} }
 @inproceedings{dobbs_caldwell_miniat_sun_nelson_2019, title={A new national spatial database of inter-basin surface water transfers}, booktitle={North Carolina GIS 2019 Annual Meeting}, author={Dobbs, G.R. and Caldwell, P.V. and Miniat, C.F. and Sun, G. and Nelson, S.A.C.}, year={2019}, month={Feb} }
 @inproceedings{jouzi_leung_nelson_2019, title={A proposed remote-sensing approach to analyzing the association between environmental changes and human health in Sub-Saharan Africa}, booktitle={American Association of Geographers}, author={Jouzi, Z.S. and Leung, Y. and Nelson, S.A.C.}, year={2019}, month={Apr} }
 @inproceedings{liu_dobbs_caldwell_miniat_bolstad_nelson_sun_2019, title={Benefits of State and Private Forest Lands for Water Supply in the Southern United State}, booktitle={American Geophysical Union (AGU) Fall Meeting}, author={Liu, N. and Dobbs, G.R. and Caldwell, P.V. and Miniat, C.F. and Bolstad, P.V. and Nelson, S.A.C. and Sun, G.}, year={2019}, month={Dec} }
 @book{liu_dobbs_caldwell_miniat_bolstad_nelson_sun_2019, place={Asheville, NC}, title={Benefits of State and Private Forest Lands for Water Supply in the Southern United States}, institution={U.S. Department of Agriculture Forest Service, Southern Research Station}, author={Liu, N. and Dobbs, G.R. and Caldwell, P.V. and Miniat, C.F. and Bolstad, P.V. and Nelson, S.A.C. and Sun, G.}, year={2019} }
 @inproceedings{belica_nelson_caldwell_mitasova_2019, title={Evaluating the Influence of Solar Radiation on Stream Thermal Regimes with Alternative Metrics and Geospatial Modeling Methods}, booktitle={American Fisheries Society & The Wildlife Society 2019 Joint Annual Conference}, author={Belica, L. and Nelson, S.A.C. and Caldwell, P.V. and Mitasova, H.}, year={2019}, month={Oct} }
 @inproceedings{dobbs_caldwell_miniat_nelson_sun_duan_2019, title={Hydrologic modeling and inter-basin surface water transfers: building a comprehensive IBT geodatabase for the conterminous United States}, booktitle={2019 American Association of Geographers Annual Meeting}, author={Dobbs, G.R. and Caldwell, P.V. and Miniat, C.F. and Nelson, S.A.C. and Sun, G. and Duan, K.}, year={2019}, month={Apr} }
 @inproceedings{belica_caldwell_petras_mitasova_mccarter_nelson_2019, title={Influence of topography on stream insolation and thermal regimes in a mid-latitude, montane, forested headwater}, booktitle={American Geophysical Union (AGU) Fall Meeting}, author={Belica, L. and Caldwell, P.V. and Petras, V. and Mitasova, H. and McCarter, J.B. and Nelson, S.A.C.}, year={2019}, month={Dec} }
 @article{hain_moody_lamphere_nelson_mcintyre_gilliam_blum_2019, title={Migratory gauntlets on oceanic islands: Watershed disturbance increases the cost of amphidromy}, volume={28}, ISSN={0906-6691 1600-0633}, url={http://dx.doi.org/10.1111/eff.12467}, DOI={10.1111/eff.12467}, abstractNote={AbstractMigratory fishes can be threatened by conditions encountered along dispersal pathways that impede access to feeding or breeding grounds. In this study, we tested the hypothesis that amphidromous fishes are equally or more sensitive to conditions along dispersal pathways than conditions in primary residential habitats. We did so by conducting distribution‐wide population surveys of all five amphidromous gobies native to the Hawaiian Islands to assess responses to in‐stream habitat, invasive species and watershed land use. We used Redundancy Analyses to assess whether goby densities varied according to local, downstream or upstream conditions. We found that population densities of the two non‐climbing species (Eleotris sandwicensis, Stenogobius hawaiiensis) varied according to local land use and local habitat conditions. Greater densities of E. sandwicensis also were found in watersheds with greater forest cover upstream of survey sites. Lower densities of two species that migrate farther inland (Awaous stamineus, Sicyopterus stimpsoni) were observed in watersheds with greater anthropogenic land use downstream or at the stream mouth. Population densities of E. sandwicensis and both Sicydiine species (Lentipes concolor, S. stimpsoni) also were lower when non‐native Poeciliids were locally present or present downstream in the watershed. These findings suggest that densities of native Hawaiian amphidromous fishes are equally or more sensitive to conditions along migratory pathways relative to conditions in primary residential habitats. Thus, alleviating pressures by removing invasive species and restoring habitat along dispersal pathways could be effective approaches to increasing densities of amphidromous species, especially those that migrate farther inland to higher elevations.}, number={3}, journal={Ecology of Freshwater Fish}, publisher={Wiley}, author={Hain, Ernie F. and Moody, Kristine N. and Lamphere, Bradley A. and Nelson, Stacy A. C. and McIntyre, Peter B. and Gilliam, James F. and Blum, Michael J.}, year={2019}, month={Feb}, pages={446–458} }
 @inproceedings{nelson_2019, title={Remote Sensing Applications}, booktitle={Center for Geospatial Analytics Faculty Fellows Symposium}, author={Nelson, S.A.C.}, year={2019}, month={Feb} }
 @book{nelson_khorram_2018, title={Image Processing and Data Analysis with ERDAS IMAGINE®}, ISBN={9781315269948}, url={http://dx.doi.org/10.1201/b21969}, DOI={10.1201/b21969}, abstractNote={Remotely sensed data, in the form of digital images captured from spaceborne and airborne platforms, provide a rich analytical and observational source of information about the current status, as well as changes occurring in, on, and around the Earth's surface. The data products, or simply images processed from these platforms, provide an additional advantage in that geographic areas or regions of interest can be revisited on a regular cycle. This revisit cycle allows geospatial analysts and natural resource managers to explore changing conditions over time. Image Processing and Data Analysis with ERDAS IMAGINE® explains the principles behind the processing of remotely sensed data in a simple, easy to understand, and "how-to" format. Organized as a step-by-step guide with exercises adapted from original research and using publicly available imagery, such as NASA Landsat, ESA Sentinel-2, Orthophotos, and others, this book gives readers the ability to quickly gain the practical experience needed to navigate the ERDAS IMAGINE® software as well as learn certain applications in Esri's ArcMap ArcGIS for Desktop software and Quantum the GIS (QGIS) open source applications package. It also helps readers to easily move beyond the information presented in this book and tackle more advanced skills. Written by two professors with long experience in remote sensing and image processing, this book is a useful guide and reference for both undergraduate and graduate students, researchers, instructors, managers, and agency professionals who are involved in the study of Earth systems and the environment.}, publisher={CRC Press}, author={Nelson, Stacy A. C. and Khorram, Siamak}, year={2018}, month={Oct} }
 @inproceedings{belica_petrasova_caldwell_nelson_2018, title={Minimal data collection for maxima results, combining geospatial modeling and a heat flux approach to the thermal regimes of headwater streams in a humid, hardwood forest}, booktitle={2018 American Geophysical Union Meeting}, author={Belica, L. and Petrasova, A. and Caldwell, P.V. and Nelson, S.A.C.}, year={2018}, month={Dec} }
 @article{khorram_nelson_wiele_cakir_2017, title={Fundamentals of Remote Sensing Imaging and Preliminary Analysis}, ISBN={["978-3-319-23385-7"]}, DOI={10.1007/978-3-319-23386-4_46}, journal={HANDBOOK OF SATELLITE APPLICATIONS,2ND EDITION}, author={Khorram, Siamak and Nelson, Stacy A. C. and Wiele, Cynthia F. and Cakir, Halil}, year={2017}, pages={981–1016} }
 @article{khorram_nelson_wiele_cakir_2017, title={Processing and Applications of Remotely Sensed Data}, ISBN={["978-3-319-23385-7"]}, DOI={10.1007/978-3-319-23386-4_92}, journal={HANDBOOK OF SATELLITE APPLICATIONS,2ND EDITION}, author={Khorram, Siamak and Nelson, Stacy A. C. and Wiele, Cynthia F. and Cakir, Halil}, year={2017}, pages={1017–1046} }
 @article{jaime_van bloem_koch_nelson_2017, title={Spread of common native and invasive grasses and ruderal trees following anthropogenic disturbances in a tropical dry forest}, volume={6}, ISSN={2192-1709}, url={http://dx.doi.org/10.1186/s13717-017-0103-7}, DOI={10.1186/s13717-017-0103-7}, abstractNote={A fundamental challenge to the integrity of tropical dry forest ecosystems is the invasion of non-native grass species. These grasses compete for resources and fuel anthropogenic wildfires. In 2012, a bulldozer from the Puerto Rico Electric Power Authority cleared a 570-m trail from a state road into a mature dry forest section of Guánica Forest to control a wildfire. We monitored colonization by a non-native invasive grass (Megathyrsus maximus), a highly invasive tree (Leucaena leucocephala), and a native grass (Uniola virgata), as well as natural regeneration, along the bulldozer trail. We determined whether bulldozing facilitated colonization by these species into the forest and the extent of spread. Distance from propagule source and temporal variations strongly influenced colonization by our three focal species. Megathyrsus maximus invaded along the trail from source populations by the state road. The establishment of new colonies of M. maximus seedlings went as far as 570 m inside the forest (i.e., at the end of the bulldozer trail), but we found most new colonies within 270 m of the road. Leucaena leucocephala exhibited a similar spreading pattern. Before disturbance, Uniola virgata was distributed widely across the forest, but the highest densities were found in areas near the latter portion (> 401 m) of the bulldozer trail. Subsequently, the species formed new clumps along more than half of the trail (250 to 570 m), apparently colonizing from undisturbed patches nearby. Bulldozing facilitated the invasion of non-native vegetation. The projected community assemblage will be more fire-prone than before since M. maximus carries fire across the landscape better than U. virgata, emphasizing the capacity of invasive plant colonization to alter local ecological processes after only a single wildfire and bulldoze event. Our results provide a valuable baseline for short-term vegetation response to anthropogenic disturbances in tropical semi-deciduous dry forests.}, number={1}, journal={Ecological Processes}, publisher={Springer Science and Business Media LLC}, author={Jaime, Xavier A. and Van Bloem, Skip J. and Koch, Frank H. and Nelson, Stacy A. C.}, year={2017}, month={Oct} }
 @article{hain_kennen_caldwell_nelson_sun_mcnulty_2017, title={Using regional scale flow-ecology modeling to identify catchments where fish assemblages are most vulnerable to changes in water availability}, volume={63}, ISSN={0046-5070}, url={http://dx.doi.org/10.1111/fwb.13048}, DOI={10.1111/fwb.13048}, abstractNote={Abstract


Streamflow is essential for maintaining healthy aquatic ecosystems and for supporting human water supply needs. Changes in climate, land use and water use practices may alter water availability. Understanding the potential effect of these changes on aquatic ecosystems is critical for long‐term water management to maintain a balance between water for human consumption and ecosystem needs.

Fish species data and streamflow estimates from a rainfall‐runoff and flow routing model were used to develop boosted regression tree models to predict the relationship between streamflow and fish species richness (FSR) under plausible scenarios of (1) water withdrawal, (2) climate change and (3) increases in impervious surfaces in the Piedmont ecoregion of North Carolina, U.S.A. Maximum monthly flow, the fraction of total flow originating from impervious surface runoff, coefficient of monthly streamflow variability, and the specific river basin accounted for 50% of the variability in FSR. This model was used to predict FSR values for all twelve‐digit Hydrological Unit Code catchments (HUC‐12s) in the North Carolina Piedmont under current flow conditions and under water withdrawal, climate change and impervious surface scenarios.

Flow–ecology modeling results indicate that predicted FSR declined significantly with increased water withdrawals. However, the magnitude of decline varied geographically. A “hot‐spot” analysis was conducted based on predicted changes in FSR under each scenario to understand which HUC‐12s were most likely to be affected by changes in water withdrawals, climate and impervious surfaces. Under the 20% withdrawal increase scenario, 413 of 886 (47%) HUC‐12s in the study area were predicted to lose one or more species. HUC‐12s in the Broad, Catawba, Yadkin and Cape Fear river basins were most susceptible to species loss.

These findings may help decision making efforts by identifying catchments most vulnerable to changing water availability. Additionally, FSR‐discharge modeling results can assist resource agencies, water managers and stakeholders in assessing the effect of water withdrawals in catchments to better support the protection and long‐term conservation of species.

}, number={8}, journal={Freshwater Biology}, publisher={Wiley}, author={Hain, Ernie F. and Kennen, Jonathan G. and Caldwell, Peter V. and Nelson, Stacy A.C. and Sun, Ge and McNulty, Steven G.}, year={2017}, month={Nov}, pages={928–945} }
 @article{hain_lamphere_blum_mcintyre_nelson_gilliam_2016, title={Comparison of Visual Survey and Mark-Recapture Population Estimates of a Benthic Fish in Hawaii}, volume={145}, ISSN={["1548-8659"]}, DOI={10.1080/00028487.2016.1159610}, abstractNote={AbstractVisual surveys are conducted to rapidly estimate population densities of stream fishes, often without calibration against more established or more widely used methods to determine precision and accuracy or to correct for potential biases. We compared population density estimates from a visual survey (VS) point quadrat method widely used in Hawaii with estimates from “in hand” individual and batch mark–recapture (BMR) methods. Visual survey sampling and individual mark–recapture (IMR) sampling were conducted in three watersheds that represent gradients of land use and prevalence of nonnative poeciliid fishes on the Island of Hawaii. Focusing on adult O‘opu Nākea Awaous stamineus, VSs were conducted prior to IMR events to allow direct comparisons of results independent of location and time. Density estimates of O‘opu Nākea from VS and IMR samplings were strongly correlated, although VS estimates were generally higher and underrepresented exceptionally large fish. Batch mark–recapture estimates of O‘opu Nākea densities were conducted for comparison with VSs at 13 sites across the archipelago. Estimates of VSs were not significantly different from BMR estimates. Estimates of VSs also exhibited less variance than did BMR estimates across sites. General linear models showed that the relationship between VS and IMR estimates varied significantly among watersheds but not seasons and that land use was associated with a greater mismatch between VS and BMR estimates of population density. These findings indicate that visual surveys using a point quadrat method are an efficient and accurate approach for estimating the abundance of small benthic fishes, such as O‘opu Nākea, in wadeable streams and that obtaining absolute densities or size distributions from VS methods would benefit from a calibration with IMR not BMR estimates.Received July 15, 2015; accepted February 23, 2016 Published online June 29, 2016}, number={4}, journal={TRANSACTIONS OF THE AMERICAN FISHERIES SOCIETY}, author={Hain, Ernie F. and Lamphere, Bradley A. and Blum, Michael J. and McIntyre, Peter B. and Nelson, Stacy A. C. and Gilliam, James F.}, year={2016}, pages={878–887} }
 @inbook{khorram_nelson_van der wiele_cakir_2016, title={Fundamentals of Remote Sensing Imaging and Preliminary Analysis}, ISBN={9781461464235}, url={http://dx.doi.org/10.1007/978-1-4614-6423-5_46-3}, DOI={10.1007/978-1-4614-6423-5_46-3}, abstractNote={Airborne and satellite digital image acquisition, preprocessing, and data reduction techniques as applied to remotely sensed data for the purpose of extracting useful Earth resources information are discussed in this chapter. The image processing and postprocessing tools are described in the next chapter. The concepts discussed in this chapter include:}, booktitle={Handbook of Satellite Applications}, publisher={Springer New York}, author={Khorram, Siamak and Nelson, Stacy A. C. and van der Wiele, Cynthia F. and Cakir, Halil}, year={2016}, pages={1–36} }
 @inproceedings{belica_caldwell_mitasova_mccarter_smith_nelson_2016, title={Investigation of the Relative Effects of Insolation, Groundwater, and Spatial Variability in the Temperature Dynamics of Two Headwater Streams}, booktitle={2015 American Geophysical Union Annual Meeting}, author={Belica, L. and Caldwell, P.V. and Mitasova, H. and McCarter, J. and Smith, J. and Nelson, S.A.C.}, year={2016}, month={Dec} }
 @book{khorram_van der wiele_koch_nelson_potts_2016, title={Principles of Applied Remote Sensing}, ISBN={9783319225593 9783319225609}, url={http://dx.doi.org/10.1007/978-3-319-22560-9}, DOI={10.1007/978-3-319-22560-9}, publisher={Springer International Publishing}, author={Khorram, Siamak and van der Wiele, Cynthia F. and Koch, Frank H. and Nelson, Stacy A. C. and Potts, Matthew D.}, year={2016} }
 @inbook{khorram_nelson_van der wiele_cakir_2016, title={Processing and Applications of Remotely Sensed Data}, ISBN={9781461464235}, url={http://dx.doi.org/10.1007/978-1-4614-6423-5_92-3}, DOI={10.1007/978-1-4614-6423-5_92-3}, booktitle={Handbook of Satellite Applications}, publisher={Springer New York}, author={Khorram, Siamak and Nelson, Stacy A. C. and van der Wiele, Cynthia F. and Cakir, Halil}, year={2016}, pages={1–30} }
 @article{ozen_nelson_khorra_moorman_cakir_2016, title={Use of Limited Data to Model Lake Water Clarity from Remote Sensed Data in Lake Mattamuskeet, North Carolina}, volume={12}, ISSN={2330-1740 2330-1759}, url={http://dx.doi.org/10.18005/jesr0401005}, DOI={10.18005/jesr0401005}, journal={Journal of Earth Science Research}, publisher={Bowen Publishing Company}, author={Ozen, Sibel and Nelson, Stacy A. C. and Khorra, Siamak and Moorman, Michelle and Cakir, Halil}, year={2016}, month={Dec}, pages={43–54} }
 @inproceedings{hain_kennen_caldwell_nelson_sun_mcnulty_2016, title={Water Abstraction Could Trump Climate and Land Cover Change in Altering Future Fish Species Richness in North Carolina Piedmont Streams}, booktitle={2016 Society for Freshwater Science}, author={Hain, E.F. and Kennen, J.G. and Caldwell, P.V. and Nelson, S.A.C. and Sun, G. and McNulty, S.}, year={2016}, month={May} }
 @article{caldwell_kennen_sun_kiang_butcher_eddy_hay_lafontaine_hain_nelson_et al._2015, title={A comparison of hydrologic models for ecological flows and water availability}, volume={8}, ISSN={1936-0584}, url={http://dx.doi.org/10.1002/ECO.1602}, DOI={10.1002/ECO.1602}, abstractNote={AbstractRobust hydrologic models are needed to help manage water resources for healthy aquatic ecosystems and reliable water supplies for people, but there is a lack of comprehensive model comparison studies that quantify differences in streamflow predictions among model applications developed to answer management questions. We assessed differences in daily streamflow predictions by four fine‐scale models and two regional‐scale monthly time step models by comparing model fit statistics and bias in ecologically relevant flow statistics (ERFSs) at five sites in the Southeastern USA. Models were calibrated to different extents, including uncalibrated (level A), calibrated to a downstream site (level B), calibrated specifically for the site (level C) and calibrated for the site with adjusted precipitation and temperature inputs (level D). All models generally captured the magnitude and variability of observed streamflows at the five study sites, and increasing level of model calibration generally improved performance. All models had at least 1 of 14 ERFSs falling outside a +/−30% range of hydrologic uncertainty at every site, and ERFSs related to low flows were frequently over‐predicted. Our results do not indicate that any specific hydrologic model is superior to the others evaluated at all sites and for all measures of model performance. Instead, we provide evidence that (1) model performance is as likely to be related to calibration strategy as it is to model structure and (2) simple, regional‐scale models have comparable performance to the more complex, fine‐scale models at a monthly time step. Copyright © 2015 John Wiley & Sons, Ltd.}, number={8}, journal={Ecohydrology}, publisher={Wiley}, author={Caldwell, Peter V. and Kennen, Jonathan G. and Sun, Ge and Kiang, Julie E. and Butcher, Jon B. and Eddy, Michele C. and Hay, Lauren E. and LaFontaine, Jacob H. and Hain, Ernie F. and Nelson, Stacy A. C. and et al.}, year={2015}, month={Feb}, pages={1525–1546} }
 @article{rice_emanuel_vose_nelson_2015, title={Continental U.S. streamflow trends from 1940 to 2009 and their relationships with watershed spatial characteristics}, volume={51}, ISSN={0043-1397}, url={http://dx.doi.org/10.1002/2014WR016367}, DOI={10.1002/2014WR016367}, abstractNote={AbstractChanges in streamflow are an important area of ongoing research in the hydrologic sciences. To better understand spatial patterns in past changes in streamflow, we examined relationships between watershed‐scale spatial characteristics and trends in streamflow. Trends in streamflow were identified by analyzing mean daily flow observations between 1940 and 2009 from 967 U.S. Geological Survey stream gages. Results indicated that streamflow across the continental U.S., as a whole, increased while becoming less extreme between 1940 and 2009. However, substantial departures from the continental U.S. (CONUS) scale pattern occurred at the regional scale, including increased annual maxima, decreased annual minima, overall drying trends, and changes in streamflow variability. A subset of watersheds belonging to a reference data set exhibited significantly smaller trend magnitudes than those observed in nonreference watersheds. Boosted regression tree models were applied to examine the influence of watershed characteristics on streamflow trend magnitudes at both the CONUS and regional scale. Geographic location was found to be of particular importance at the CONUS scale while local variability in hydroclimate and topography tended to have a strong influence on regional‐scale patterns in streamflow trends. This methodology facilitates detailed, data‐driven analyses of how the characteristics of individual watersheds interact with large‐scale hydroclimate forces to influence how changes in streamflow manifest.}, number={8}, journal={Water Resources Research}, publisher={American Geophysical Union (AGU)}, author={Rice, Joshua S. and Emanuel, Ryan E. and Vose, James M. and Nelson, Stacy A. C.}, year={2015}, month={Aug}, pages={6262–6275} }
 @article{hurley-sanders_levine_nelson_law_showers_stoskopf_2015, title={Key metabolites in tissue extracts ofElliptio complanataidentified using1H nuclear magnetic resonance spectroscopy}, volume={3}, ISSN={2051-1434}, url={http://dx.doi.org/10.1093/conphys/cov023}, DOI={10.1093/conphys/cov023}, abstractNote={We used 1H-NMR to describe the freshwater mussel metabolome. Muscle, digestive gland, mantle and gill tissues yielded profiles with possible biomarkers of physiologic function. These preliminary studies provide evidence for potential use of digestive gland and mantle tissue for studying physiological impacts of location, sex and reproductive condition on Elliptio complanata.}, number={1}, journal={Conservation Physiology}, publisher={Oxford University Press (OUP)}, author={Hurley-Sanders, Jennifer L. and Levine, Jay F. and Nelson, Stacy A. C. and Law, J. M. and Showers, William J. and Stoskopf, Michael K.}, year={2015}, pages={cov023} }
 @inproceedings{kennen_hain_caldwell_nelson_sun_mcnulty_2015, title={Modeling Fish Species Response to changes in Water Availability and Climate in the North Carolina Piedmont, USA}, booktitle={Society for Freshwater Science Annual Meeting}, author={Kennen, J.G. and Hain, E.F. and Caldwell, P. and Nelson, S.A.C. and Sun, G. and McNulty, S.}, year={2015}, month={May} }
 @article{hurley-sanders_stoskopf_nelson_showers_law_gracz_levine_2015, title={Tissue extraction methods for metabolic profiling of a freshwater bivalve, Elliptio complanata}, volume={33}, ISSN={0740-2783 2162-2698}, url={http://dx.doi.org/10.4003/006.033.0209}, DOI={10.4003/006.033.0209}, abstractNote={Abstract: 
 Much is still unknown about why freshwater mussels (Unionidae) are particularly sensitive to environmental change. A better understanding of freshwater mussel metabolism is needed, and the field of environmental metabolomics holds the promise to inform these questions. A number of protocols exist for the extraction of metabolites for identification from animal tissues. As a first step in the application of environmental metabolomics to the study of freshwater mussels, we compared extraction protocols using an inorganic oxidizing acid (perchloric acid), an organic nitrile (acetonitrile), and a salt/water solution (Ringer's solution) to establish an uncomplicated, robust, repeatable and inexpensive tissue extraction protocol for freshwater mussel tissue. Perchloric acid resulted in notable extraction of energy-related nucleotides (AMP/ADP/ATP), yet had the lowest peak count of the three extraction methods and showed poor repeatability. Acetonitrile and Ringer's solution yielded metabolite extraction results similar to each other with Ringer's solution having the greatest number of peaks particularly in the 3.0–4.5 ppm sugar/amino acid range. Ringer's solution is simple to use, safe and consistent and bears consideration when selecting an extraction protocol for 1H nuclear magnetic resonance experiments.}, number={2}, journal={American Malacological Bulletin}, publisher={American Malacological Society}, author={Hurley-Sanders, J.L. and Stoskopf, M. and Nelson, S.A.C. and Showers, W. and Law, J.M. and Gracz, H.S. and Levine, J.F.}, year={2015}, pages={185–194} }
 @inproceedings{nelson_hain_johnson_louie_2015, title={Use of GIS and statistical analysis to evaluate potential climate change impacts on the spatial distribution of brook trout populations within the eastern United States}, booktitle={2015 International Symposium on the Advances in the Population Ecology of Stream Salmonids}, author={Nelson, S.A.C. and Hain, E.F. and Johnson, A. and Louie, J.}, year={2015}, month={May} }
 @inbook{nelson_johnson_2014, place={Albuquerque, New Mexico}, title={Application of Multidimensional Recruitment and Mentoring of Underrepresented Students}, booktitle={Developmental Networks: Mentoring and Coaching at Work}, publisher={University of New Mexico Mentoring Institute}, author={Nelson, S.A.C. and Johnson, A.}, editor={Dominguez, N. and Gandert, Y.Editors}, year={2014}, pages={739–741} }
 @inproceedings{nelson_hain_hartis_johnson_2014, title={Changing the Game: Multidimensional Mentoring and Partnerships in the Recruitment of Underrepresented Students in Fisheries}, booktitle={Fourth World Fisheries Congress of the 144th Annual American Fisheries Society Meeting}, author={Nelson, S.A.C. and Hain, E.F. and Hartis, B.M. and Johnson, A.}, year={2014}, month={Aug} }
 @inbook{nelson_hain_hartis_johnson_2014, title={Changing the game: Multidimensional mentoring and partnerships in the recruitment of underrepresented students in fisheries}, booktitle={Future of Fisheries: Perspectives for Emerging Professionals}, author={Nelson, S. A. C. and Hain, E. F. and Hartis, B. M. and Johnson, A.}, year={2014}, pages={193–200} }
 @inproceedings{xavier_nelson_koch_van bloem_2014, title={Forest resilience and soil dynamics response to anthropogenic disturbances in dry semi-deciduous forests in Puerto Rico}, booktitle={99th Ecological Society of America Annual Meeting}, author={Xavier, A.J. and Nelson, S.A.C. and Koch, F. and Van Bloem, S.}, year={2014}, month={Aug} }
 @book{kennen_hain_caldwell_nelson_sun_mcnulty_shortley_2014, place={Raleigh, North Carolina}, title={Hydrological modeling for flow-ecology science in the Southeastern U.S.}, institution={Department of the Interior Southeast Climate Science Center}, author={Kennen, J.G. and Hain, E.F. and Caldwell, P. and Nelson, S.A.C. and Sun, G. and McNulty, S. and Shortley, T.}, year={2014} }
 @article{derolph_nelson_kwak_hain_2015, title={Predicting fine-scale distributions of peripheral aquatic species in headwater streams}, volume={5}, ISSN={["2045-7758"]}, DOI={10.1002/ece3.1331}, abstractNote={AbstractHeadwater species and peripheral populations that occupy habitat at the edge of a species range may hold an increased conservation value to managers due to their potential to maximize intraspecies diversity and species' adaptive capabilities in the context of rapid environmental change. The southern Appalachian Mountains are the southern extent of the geographic range of native Salvelinus fontinalis and naturalized Oncorhynchus mykiss and Salmo trutta in eastern North America. We predicted distributions of these peripheral, headwater wild trout populations at a fine scale to serve as a planning and management tool for resource managers to maximize resistance and resilience of these populations in the face of anthropogenic stressors. We developed correlative logistic regression models to predict occurrence of brook trout, rainbow trout, and brown trout for every interconfluence stream reach in the study area. A stream network was generated to capture a more consistent representation of headwater streams. Each of the final models had four significant metrics in common: stream order, fragmentation, precipitation, and land cover. Strahler stream order was found to be the most influential variable in two of the three final models and the second most influential variable in the other model. Greater than 70% presence accuracy was achieved for all three models. The underrepresentation of headwater streams in commonly used hydrography datasets is an important consideration that warrants close examination when forecasting headwater species distributions and range estimates. Additionally, it appears that a relative watershed position metric (e.g., stream order) is an important surrogate variable (even when elevation is included) for biotic interactions across the landscape in areas where headwater species distributions are influenced by topographical gradients.}, number={1}, journal={ECOLOGY AND EVOLUTION}, author={DeRolph, Christopher R. and Nelson, Stacy A. C. and Kwak, Thomas J. and Hain, Ernie F.}, year={2015}, month={Jan}, pages={152–163} }
 @inbook{khorram_nelson_cakir_van der wiele_2013, title={Digital Image Acquisition: Preprocessing and Data Reduction}, ISBN={9781441976703 9781441976710}, url={http://dx.doi.org/10.1007/978-1-4419-7671-0_46}, DOI={10.1007/978-1-4419-7671-0_46}, booktitle={Handbook of Satellite Applications}, publisher={Springer New York}, author={Khorram, Siamak and Nelson, Stacy A. C. and Cakir, Halil and van der Wiele, Cynthia F.}, year={2013}, pages={809–837} }
 @inbook{khorram_nelson_cakir_van der wiele_2013, title={Digital Image Processing: Post-processing and Data Integration}, ISBN={9781441976703 9781441976710}, url={http://dx.doi.org/10.1007/978-1-4419-7671-0_92}, DOI={10.1007/978-1-4419-7671-0_92}, booktitle={Handbook of Satellite Applications}, publisher={Springer New York}, author={Khorram, Siamak and Nelson, Stacy and Cakir, Halil and Van Der Wiele, Cynthia}, year={2013}, pages={839–864} }
 @book{nelson_goldfarb_2013, title={Producing a More Diverse Workforce in Natural Resources: Establishing Relationships and Laying the Groundwork for Graduate Education for Students from Puerto Rico}, institution={Southern Research Office, U.S. Department of Agriculture Forest Service}, author={Nelson, S.A.C. and Goldfarb, B.}, year={2013}, month={Jun} }
 @inbook{hester_nelson_khorram_cakir_cheshire_hain_2012, title={Analysis of Impervious Surface and Suburban Form Using High Spatial Resolution Satellite Imagery}, ISBN={9781439877432 9781439877449}, url={http://dx.doi.org/10.1201/b11702-13}, DOI={10.1201/b11702-13}, booktitle={Environmental Remote Sensing and Systems Analysis}, publisher={CRC Press}, author={Hester, D and Nelson, Stacy and Khorram, Siamak and Cakir, Halil and Cheshire, Heather and Hain, Ernst}, year={2012}, month={Feb}, pages={209–230} }
 @article{hain_nelson_tracy_cakir_2012, title={Application of GIS Techniques for Developing a Fish Index of Biotic Integrity for an Ecoregion with Low Species Richness}, volume={11}, ISSN={["1528-7092"]}, DOI={10.1656/058.011.0410}, abstractNote={Abstract 
 We describe a process for developing an index of biotic integrity (IBI) for resident fish communities in an ecoregion that exhibits low natural species richness. From 1990 to 2006, fish community samples were collected by the North Carolina Division of Water Quality (NCDWQ) at 36 sample sites in the Cape Fear, Lumber, and Yadkin river basins within the Sandhills region of North Carolina. The NCDWQ does not currently have an IBI capable of distinguishing significant differences between reference and non-reference streams. To develop a more robust method of measuring responses to anthropogenic disturbance, we delineated contributing watersheds for each of the 36 sample sites using a geographic information system, hydrologic modeling, and 20-foot-resolution digital elevation models derived from light-detection and ranging data. The 2001 National Land Cover Database (NLCD) and in situ habitat data were used to determine various land-use/land-cover and hydrologic variables within each watershed. These variables were then used to select the sites with absolute minimal anthropogenic impacts. We used the Kruskal-Wallis test to identify 11 fish-community metrics, 2 chemical metrics, and 9 individual species that were significantly different between reference and non-reference sites. Of the final 15 metrics, only 3 exhibited higher values in reference streams. Our results demonstrate that the abundance and richness of the Sandhills fish fauna are greater in areas more highly impacted by anthropogenic activities. By automating the process by which reference sites are chosen, we were able to produce a multi-metric IBI that reflects the varying levels of anthropogenic impacts on wadeable streams in the Sandhills.}, number={4}, journal={SOUTHEASTERN NATURALIST}, author={Hain, Ernie F. and Nelson, Stacy A. C. and Tracy, Bryn H. and Cakir, Halil I.}, year={2012}, month={Dec}, pages={711–732} }
 @inproceedings{hurley-sanders_stoskopf_eads_fraley_gracz_law_nelson_levine_2012, title={Metabolomics as a diagnostic tool in the investigation of a freshwater bivalve die-off}, booktitle={Metabolomics Society 2012}, author={Hurley-Sanders, J.L. and Stoskopf, M.K. and Eads, C.B. and Fraley, S.J. and Gracz, H.S. and Law, J.M. and Nelson, S.A.C. and Levine, J.F.}, year={2012}, month={Jun} }
 @article{laird_nelson_stubbs_james_menius_2012, title={Organizational Structures and Data Use in Volunteer Monitoring Organizations (VMOs)}, volume={11}, ISSN={1533-015X 1533-0389}, url={http://dx.doi.org/10.1080/1533015X.2012.776918}, DOI={10.1080/1533015X.2012.776918}, abstractNote={Complex environmental problems call for unique solutions to monitoring efforts alongside developing a more environmentally literate citizenry. Community-based monitoring (CBM) through the use of volunteer monitoring organizations helps to provide a part of the solution, particularly when CBM groups work with research scientists or government managers. This study of volunteer monitoring organizations (VMOs) active in 2009 in the United States was conducted via survey in order to better understand the organizational structure, data collection procedures and data use of water-quality monitoring by volunteers, focusing on North Carolina. Organizational structures and origins of monitoring groups are discussed and reveal a wide variety of types and history of programs. Data collection procedures including required training and quality assurance were explored and discussed through the survey. Many groups require training of a varied type, but fewer complete quality assurance plans. Multiple types of volunteer monitoring data uses were indicated, including management and research. This study suggests a lack of structure at the state level may hinder the usefulness of data collected for purposes other than local information and environmental education. Cooperation between research scientists and VMOs may aid organizations in publishing more of their data and developing a quality assurance plan.}, number={3-4}, journal={Applied Environmental Education & Communication}, publisher={Informa UK Limited}, author={Laird, Shelby Gull and Nelson, Stacy A.C. and Stubbs, Harriett S. and James, April L. and Menius, Erika}, year={2012}, month={Jul}, pages={165–177} }
 @book{khorram_nelson_koch_van der wiele_2012, title={Remote Sensing}, ISBN={9781461431022 9781461431039}, ISSN={2191-8171 2191-818X}, url={http://dx.doi.org/10.1007/978-1-4614-3103-9}, DOI={10.1007/978-1-4614-3103-9}, abstractNote={Remote Sensing provides information on how remote sensing relates to the natural resources inventory, management, and monitoring, as well as environmental concerns. It explains the role of this new te}, journal={SpringerBriefs in Space Development}, publisher={Springer US}, author={Khorram, Siamak and Nelson, Stacy A.C. and Koch, Frank H. and van der Wiele, Cynthia F.}, year={2012} }
 @inproceedings{hartis_nelson_2012, title={Satellite Remote Sensing of Submerged Aquatic Vegetation Distribution and Status in Currituck Sound, NC. Concurrent Session: Use of Sensor Technologies for Monitoring, Modeling, and Management}, booktitle={Water Resources Research Institute of the University of North Carolina System Annual Conference}, author={Hartis, B.M. and Nelson, S.A.C.}, year={2012}, month={Mar} }
 @book{nelson_hartis_2012, place={Raleigh, NC}, title={Satellite Remote Sensing of Submerged Aquatic Vegetation Distribution and Status in the Currituck Sound, NC}, institution={North Carolina Department of Transportation Research and Analysis Group}, author={Nelson, S.A.C. and Hartis, B.M.}, year={2012}, month={Nov} }
 @inproceedings{hurley-sanders_stoskopf_tikunov_gracz_macdonald_law_nelson_levine_2012, title={Use of 1H-Nuclear Magnetic Resonance to Investigate the Metabolic Profile of the Freshwater Bivalve Elliptio complanata}, booktitle={43rd Annual IAAAM Conference and Meeting}, author={Hurley-Sanders, J. and Stoskopf, M.K. and Tikunov, A. and Gracz, H.S. and Macdonald, J. and Law, J.M. and Nelson, S.A.C. and Levine, J.F.}, year={2012}, month={May} }
 @inproceedings{nelson_2011, title={Applied Geospatial Sciences and Modeling in fisheries ecology}, booktitle={Organization for Tropical Studies}, author={Nelson, S.A.C.}, year={2011}, month={Jun} }
 @article{siitari_taylor_nelson_weaver_2011, title={The influence of land cover composition and groundwater on thermal habitat availability for brook charr (Salvelinus fontinalis) populations in the United States of America}, volume={20}, ISSN={["1600-0633"]}, DOI={10.1111/j.1600-0633.2011.00487.x}, abstractNote={Abstract – Brook charr (Salvelinus fontinalis) is a sentinel fish species that requires clean, cold water habitats generally resulting from landscapes that allow for surface water flows devoid of sediment and contaminants and high groundwater discharge of cold water. As such, brook charr are impacted by land cover changes that alter stream temperature regimes. We evaluated brook charr populations across their eastern and midwestern range in the United States with reference to thermal habitat availability in relationship to land cover and per cent baseflow. We found that while forest cover does protect brook charr thermal habitat, high levels of groundwater discharge can allow for increased levels of agriculture within a watershed by keeping the water cold in spite of warm ambient summer temperatures. Our study concludes that with enhanced communication among land, water and fisheries managers, society can provide for sustainable stream salmonid populations despite increased threats on cold water resources.}, number={3}, journal={ECOLOGY OF FRESHWATER FISH}, author={Siitari, Kiira J. and Taylor, William W. and Nelson, Stacy A. C. and Weaver, Kerryann E.}, year={2011}, month={Sep}, pages={431–437} }
 @inproceedings{nelson_2010, title={Development of a GIS Enterprise System. Cooperative Ecosystem Studies Units (CESU)}, booktitle={National Network National Meeting}, author={Nelson, S.A.C.}, year={2010}, month={Jun} }
 @inproceedings{branch_nelson_devine_2010, title={From Conception to Compliance, an Interdisciplinary Approach to Spatial Thinking and GIS Education in North Carolina}, booktitle={Proceedings of the International Conference on Education, Training and Informatics}, publisher={ICETI Publishers}, author={Branch, B.D. and Nelson, S.A.C. and Devine, H.A.}, year={2010}, pages={465–470} }
 @article{hester_nelson_cakir_khorram_cheshire_2010, title={High-resolution land cover change detection based on fuzzy uncertainty analysis and change reasoning}, volume={31}, ISSN={0143-1161 1366-5901}, url={http://dx.doi.org/10.1080/01431160902893493}, DOI={10.1080/01431160902893493}, abstractNote={Land cover change detection is an important research and application area for analysts of remote sensing data. The primary objective of the research described here was to develop a change detection method capable of accommodating spatial and classification uncertainty in generating an accurate map of land cover change using high resolution satellite imagery. As a secondary objective, this method was designed to facilitate the mapping of particular types and locations of change based on specific study goals. Urban land cover change pertinent to surface water quality in Raleigh, North Carolina, was assessed using land cover classifications derived from pan-sharpened, 0.61 m QuickBird images from 2002 and 2005. Post-classification map errors were evaluated using a fuzzy logic approach. First, a ‘change index’ representing a quantitative gradient along which land cover change is characterized by both certainty and relevance, was created. The result was a continuous representation of change, a product type that retains more information and flexibility than discrete maps of change. Finally, fuzzy logic and change reasoning results were integrated into a binary change/no change map that quantified the most certain, likely, and relevant change regions within the study area. A ‘from-to’ change map was developed from this binary map inserting the type of change identified in the raw post-classification map. A from-to change map had an overall accuracy of 78.9% (κ = 0.747) and effectively mapped land cover changes posing a threat to water quality, including increases in impervious surface. This work presents an efficient fuzzy framework for transforming map uncertainty into accurate and practical change analysis.}, number={2}, journal={International Journal of Remote Sensing}, publisher={Informa UK Limited}, author={Hester, D. B. and Nelson, S. A. C. and Cakir, H. I. and Khorram, S. and Cheshire, H.}, year={2010}, month={Jan}, pages={455–475} }
 @misc{nelson_2010, title={Review of Remote Sensing for Biodiversity and Wildlife Management, by S. E. Franklin}, volume={76}, number={12}, journal={Photogrammetric Engineering & Remote Sensing}, author={Nelson, S.A.C.}, year={2010}, pages={1310–1312} }
 @inproceedings{siitari_weaver_taylor_nelson_ostroff_2010, title={The influence of riparian zone composition and groundwater withdrawal on eastern United States brook charr (Salvelinus fontinalis) population ecology and production}, booktitle={Advances in the Population of Ecology of Stream Salmonids}, author={Siitari, K.J. and Weaver, K.E. and Taylor, W.W. and Nelson, S.A.C. and Ostroff, A.C.}, year={2010}, month={May} }
 @article{miller_nelson_hess_2009, title={A new object-oriented method of impervious surface classification using feature analyst}, volume={61}, journal={Professional Geographer}, author={Miller, J. A. and Nelson, S. A. C. and Hess, G. R.}, year={2009}, pages={1–15} }
 @article{miller_nelson_hess_2009, title={An Object Extraction Approach for Impervious Surface Classification with Very-High-Resolution Imagery}, volume={61}, ISSN={["1467-9272"]}, DOI={10.1080/00330120902742920}, abstractNote={Detailed land cover maps provide important information for research and decision-making but are often expensive to develop and can become outdated quickly. Widespread availability of aerial photography provides increased accessibility of high-resolution imagery and the potential to produce high-accuracy land cover classifications. However, these classifications often require expert knowledge and are time consuming. Our goal was to develop an efficient, accurate technique for classifying impervious surface in urbanizing Wake County, North Carolina. Using an iterative training technique, we classified 111 nonmosaicked, very-high-resolution images using the Feature Analyst software developed by Visual Learning Systems. Feature Analyst provides object extraction classifications by analyzing spatial context in relation to spectral data to classify high-resolution imagery. Our image classification results were 95 percent accurate in impervious surface extraction, with an overall total accuracy of 92 percent. Using this method, users with relatively limited geographic information system (GIS) training and modest budgets can produce highly accurate object-extracted classifications of impervious and pervious surface that are easily manipulated in a GIS.}, number={2}, journal={The Professional Geographer}, author={Miller, J.E. and Nelson, S.A.C. and Hess, G.R.}, year={2009}, pages={250–264} }
 @book{perrin_gregory_nelson_beggs_penrose_litzenburger_nichols_2009, title={Black Creek Watershed Assessment, Monitoring, and Planning}, number={EPA319}, institution={NC Division of Water Quality, Department of Environment and Natural Resources}, author={Perrin, C. and Gregory, J. and Nelson, S.A.C. and Beggs, P. and Penrose, D. and Litzenburger, T. and Nichols, E.}, year={2009} }
 @inproceedings{de rolph_nelson_2009, title={Evaluating the Relationship Between Wild Trout Occurrence and Watershed Land Cover Composition in the Appalachian Mountains of Western North Carolina}, booktitle={American Fisheries Society 139th Annual Meeting}, author={De Rolph, C. and Nelson, S.A.C.}, year={2009}, month={Aug} }
 @book{nelson_devine_hain_hartis_solcumb_2009, place={Philadelphia, PA}, title={Natural Resource Condition Assessments for George Washington Birthplace National Monument and Thomas Stone National Historic Site}, number={NPS/NER/NRTR—2009}, institution={National Park Service}, author={Nelson, S.A.C. and Devine, H.A. and Hain, E.F. and Hartis, B.M. and Solcumb, W.S.}, year={2009}, month={Jul} }
 @inproceedings{hain_hartis_nelson_2009, title={Watershed/Natural Resources Assessment planning for the U.S. National Park Service}, booktitle={University of Rhode Island Graduate School of Oceanography}, author={Hain, E.F. and Hartis, B. and Nelson, S.A.C.}, year={2009}, month={Feb} }
 @inproceedings{nelson_2008, title={Applications of Spatial Information System (SIS) in Fisheries Science}, booktitle={Department of Forest and Environmental Resources Faculty Research Symposium}, author={Nelson, S.A.C.}, year={2008}, month={Jan} }
 @inproceedings{derolph_nelson_cakir_kwak_fuentes_hain_2008, title={Development and implementation of a remote sensing-based land-cover classification system to evaluate changes in watershed land cover and the associated response of wild trout populations}, booktitle={93rd Ecological Society of America Annual Meeting}, author={DeRolph, Christopher R. and Nelson, S.A.C. and Cakir, H.I. and Kwak, T. and Fuentes, M. and Hain, E.F.}, year={2008}, month={Aug} }
 @inproceedings{hain_nelson_maddalena_derolph_2008, title={Development of a multiple criteria index for the assessment of watershed conditions in two National Parks}, booktitle={93rd Ecological Society of America Annual Meeting}, author={Hain, Ernie F. and Nelson, S.A.C. and Maddalena, D. and DeRolph, C.R.}, year={2008}, month={Aug} }
 @article{hester_cakir_nelson_khorram_2008, title={Per-pixel classification of high spatial resolution satellite imagery for urban land-cover mapping}, volume={74}, ISSN={["2374-8079"]}, DOI={10.14358/PERS.74.4.463}, abstractNote={Commercial high spatial resolution satellite data now provide a synoptic and consistent source of digital imagery with detail comparable to that of aerial photography. In the work described here, per-pixel classification, image fusion, and GIS-based map refinement techniques were tailored to pan-sharpened 0.61 m QuickBird imagery to develop a six-category urban land-cover map with 89.3 percent overall accuracy ( �� 0.87). The study area was a rapidly developing 71.5 km 2 part of suburban Raleigh, North Carolina, U.S.A., within the Neuse River basin. “Edge pixels” were a source of classification error as was spectral overlap between bare soil and impervious surfaces and among vegetated cover types. Shadows were not a significant source of classification error. These findings demonstrate that conventional spectral-based classification methods can be used to generate highly accurate maps of urban landscapes using high spatial resolution imagery.}, number={4}, journal={PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING}, author={Hester, David Barry and Cakir, Halil I. and Nelson, Stacy A. C. and Khorram, Siamak}, year={2008}, month={Apr}, pages={463–471} }
 @inproceedings{harris_dunn_nelson_2008, title={Variation of Parasite Diversity across Carnivore Species and Space}, booktitle={The Wildlife Society 15th Annual Conference}, author={Harris, Nyeema C. and Dunn, R.R. and Nelson, S.A.C.}, year={2008}, month={Nov} }
 @inproceedings{miller_nelson_hess_2007, title={A New Object-Oriented Method of Impervious Surface Classification Using Feature Analyst}, booktitle={2007 Meeting of The Association of American Geographers}, author={Miller, J.A. and Nelson, S.A.C. and Hess, G.R.}, year={2007}, month={Apr} }
 @inproceedings{hain_nelson_cakir_louie_2007, title={Development of an effective fish Index of Biotic Integrity for the Sandhills Region of North Carolina}, booktitle={American Fisheries Society 137th Annual Meeting}, author={Hain, E.F. and Nelson, S.A.C. and Cakir, H.I. and Louie, J.}, year={2007}, month={Sep} }
 @inproceedings{fairey_nelson_shedd_2007, title={Predicting unidentified wetland sites along the Blue Ridge parkway}, booktitle={2007 Minorities in Agriculture Natural Resources and Related Sciences (MANRRS) Annual Conference}, author={Fairey, Donta and Nelson, S.A.C. and Shedd, J.M.}, year={2007}, month={Mar} }
 @inproceedings{louie_nelson_cakir_hain_2007, title={Prioritizing restoration efforts for the Eastern brook trout using remote sensing}, booktitle={American Fisheries Society 137th Annual Meeting}, author={Louie, J. and Nelson, S.A.C. and Cakir, Halil and Hain, E.F.}, year={2007}, month={Sep} }
 @article{cakir_khorram_nelson_2006, title={Correspondence analysis for detecting land cover change}, volume={102}, ISSN={0034-4257}, url={http://dx.doi.org/10.1016/j.rse.2006.02.023}, DOI={10.1016/j.rse.2006.02.023}, abstractNote={The correspondence analysis (CA) method was applied to two multitemporal Landsat images of Raleigh, North Carolina for land use land cover (LULC) change detection. After the spectral transformation of the individual date images into component space using CA, the first component (PC1) of the date 1 image was subtracted from the PC1 of the date 2 image to produce difference image highlighting change areas. Accuracy curves based on the cumulative Producer's and User's accuracies were then used to optimally locate threshold (cutoff) values in the high-end and low-end tails of the difference image's histogram. Results were then compared to the standardized and non-standardized Principal Component Analysis (PCA) differencing and Normalized Difference Vegetation Index (NDVI) differencing methods for change detection. Results showed that there was 6.8% increase in urban related cover types in Raleigh metropolitan area between 1993 and 1999. Also, maps based on the CA differencing method were found to be thematically more accurate than maps based on PCA component differencing methods. Overall accuracy of change map produced by the CA method for the Raleigh metropolitan area was 92.5% with overall Kappa value of 0.88. In general, CA was found to be a powerful multivariate analysis technique when applied to change detection.}, number={3-4}, journal={Remote Sensing of Environment}, publisher={Elsevier BV}, author={Cakir, Halil Ibrahim and Khorram, Siamak and Nelson, Stacy A.C.}, year={2006}, month={Jun}, pages={306–317} }
 @book{hester_cakir_nelson_khorram_2006, title={Integration of high resolution imagery in cost-effective assessment of land use practices influencing erosion and sediment yield}, volume={221}, number={222}, journal={Water Resource Research Institute final report (Center for Earth Observation Technical Report)}, institution={Center for Earth Observation Technical Report}, author={Hester, D.B. and Cakir, H.I. and Nelson, S.A.C. and Khorram, S.}, year={2006} }
 @inproceedings{williams_nelson_gregory_bullock_pyrtle_2006, title={Relationship Between Flow Regimes and Aquatic Macroinvertebrate Abundance in Headwater Streams in the Piedmont Region of North Carolina, USA}, booktitle={2006 American Geophysical Union Ocean Sciences Meeting}, author={Williams, N.B. and Nelson, S.A.C. and Gregory, J.D. and Bullock, B. and Pyrtle, A.}, year={2006}, month={Feb} }
 @article{nelson_cheruvelil_soranno_2006, title={Satellite remote sensing of freshwater macrophytes and the influence of water clarity}, volume={85}, ISSN={0304-3770}, url={http://dx.doi.org/10.1016/j.aquabot.2006.06.003}, DOI={10.1016/j.aquabot.2006.06.003}, abstractNote={In regions with thousands of lakes, large scale regional macrophyte surveys are rarely done due to logistical difficulties and high costs. We examined whether remote sensing can be used for regional monitoring of macrophytes in inland lakes using a field study of 13 lakes in Michigan, USA (nine model development lakes and four model testing lakes). Our objectives were: (1) to determine if different levels of macrophyte cover, different growth forms or specific species could be detected using the Landsat-5 TM sensor, and (2) to determine if we could improve predictions of macrophyte abundance and distribution in lakes by including sediment type or measures of water clarity (Secchi disk transparency, chlorophyll a, phytoplankton biovolume, or water color) in our models. Using binomial and multinomial logistic regression models, we found statistically significant relationships between most macrophyte measures and Landsat-5 TM values in the nine model development lakes (percent concordant values: 58–97%). Additionally, we found significant correlations between three lake characteristics and the TM values within lake pelagic zones, despite the inability of these variables to improve model predictions. However, model validation using four lakes was generally low, suggesting caution in applying these models to other lakes. Although the initial model development results suggest that remote sensing is a potentially promising tool for regionally assessing macrophytes, more research is necessary to refine the models in order for them to be applied to unsampled lakes.}, number={4}, journal={Aquatic Botany}, publisher={Elsevier BV}, author={Nelson, Stacy A.C. and Cheruvelil, Kendra Spence and Soranno, Patricia A.}, year={2006}, month={Nov}, pages={289–298} }
 @inproceedings{colson_gregory_nelson_2005, title={A Mobile Hydrologic Information System to Support Stream Origin Determinations in North Carolina}, booktitle={Water Resources Research Institute 8th Annual Conference: Managing Water Quality & Quantity: Integrating Science, Technology & Policy}, author={Colson, T. and Gregory, J.D. and Nelson, S.A.C.}, year={2005}, month={Apr} }
 @inproceedings{nelson_cakir_hester_2005, title={Current Trends in Land Use/Land Cover Mapping, Change Detection, and Monitoring from Remotely Sensed Data: Implication for Freshwater Resource Studies}, booktitle={2005 WRRI Water Research Seminar Series}, author={Nelson, S.A.C. and Cakir, H.I. and Hester, D.B.}, year={2005} }
 @inproceedings{hester_khorram_nelson_cakir_2005, title={High Resolution Land Use/Land Cover Mapping and Impervious Surface Modeling in Fast Developing Watersheds}, booktitle={Water Resources Research Institute 8th Annual Conference: Managing Water Quality & Quantity: Integrating Science, Technology & Policy}, author={Hester, D.B. and Khorram, S. and Nelson, S.A.C. and Cakir, H.I.}, year={2005}, month={Apr} }
 @book{khorram_nelson_cakir_hester_2005, title={Integration of high resolution imagery in cost-effective assessment of land use practices influencing erosion and sediment yield}, volume={221}, journal={Water Resource Research Institute final report (Center for Earth Observation Technical Report)}, author={Khorram, S. and Nelson, S. A. C. and Cakir, H. and Hester, D. B.}, year={2005} }
 @inproceedings{nelson_2004, title={ArcGIS Spatial Analysis Applications. Federation of Earth Science Information Partners}, booktitle={13th Federation Assembly Meeting}, author={Nelson, S.A.C.}, year={2004}, month={Aug} }
 @inproceedings{nelson_taylor_2003, place={Pallanza, Italy}, edition={Viterbo Province edition}, title={Overview of lake water clarity regional assessment using satellite remote sensing}, booktitle={Residence time in lakes: science, management, education}, publisher={Istituto italiano di idrobiologia}, author={Nelson, S.A.C. and Taylor, William W.}, year={2003}, pages={105–115} }
 @article{nelson_soranno_cheruvelil_batzli_skole_2003, title={Regional assessment of lake water clarity using satellite remote sensing}, volume={62}, DOI={10.4081/jlimnol.2003.s1.27}, abstractNote={Lake water clarity as measured by Secchi disk transparency (SDT) is a cost-effective measure of water quality. However, in regions where there are thousands of lakes, sampling even a small proportion of those lakes for SDT year after year is cost prohibitive. Remote sensing has the potential to be a powerful tool for assessing lake clarity over large spatial scales. The overall objective of our study was to examine whether Landsat-7 ETM+ could be used to measure water clarity across a large range of lakes. Our specific objectives were to: 1) develop a regression model to estimate SDT from Landsat data calibrated using 93 lakes in Michigan, U.S.A., and to 2) examine how the distribution of SDT across the 93 calibration lakes influenced the model. Our calibration dataset included a large number of lakes with a wide range of SDT values that captured the summer statewide distribution of SDT values in Michigan. Our regression model had a much lower r2 value than previously published studies conducted on smaller datasets. To examine the importance of the distribution of calibration data, we simulated a calibration dataset with a different SDT distribution by sub-sampling the original dataset to match the distribution of previous studies. The sub-sampled dataset had a much higher percentage of lakes with shallow water clarity, and the resulting regression model had a much higher r2 value than our original model. Our study shows that the use of Landsat to measure water clarity is sensitive to the distribution of water clarity used in the calibration set.}, number={Sup. 1}, journal={Journal of Limnology}, author={Nelson, S. A. C. and Soranno, P. A. and Cheruvelil, K. S. and Batzli, S. A. and Skole, D. L.}, year={2003}, pages={27–32} }
 @inproceedings{nelson_soranno_cheruvelil_batzli_skole_2002, title={Assessing regional lake water clarity using Landsat and the role of inter-lake variability}, booktitle={Bolsena Conference on: Residence Times in Lakes: Science, Management, Education}, author={Nelson, S.A.C. and Soranno, P.A. and Cheruvelil, K.S. and Batzli, S.A. and Skole, D.L.}, year={2002}, month={Sep} }
 @article{nelson_soranno_qi_2002, title={Land cover change in the Upper Barataria Basin Estuary, Louisiana, from 1972-1992: Increases in wetland area}, volume={29}, DOI={10.1007/s000267-001-0060-9}, number={5}, journal={Environmental Management}, author={Nelson, S. A. C. and Soranno, P. A. and Qi, J.}, year={2002}, pages={716–727} }
 @inproceedings{nelson_soranno_qi_2001, title={Land cover change in the Upper Barataria Basin Estuary, Louisiana, from 1972-1992: Increases in wetland area}, booktitle={Ecological Society of America}, author={Nelson, S.A.C. and Soranno, P.A. and Qi, J.}, year={2001}, month={Aug} }
 @article{nelson_1997, title={Use of remote sensing to assess vegetative productivity in a section of the Barataria Bay estuary}, journal={NASA-ASSE Summer Faculty Fellowship Program final report}, publisher={Stennis Space Center, Miss.: John C. Stennis Space Center}, author={Nelson, S. A. C.}, year={1997}, pages={164–174} }
 @book{nelson_1996, title={Advances in wetland status and trends monitoring--cumulative error comparisons (Wetlands Program technical report, no. 96-6)}, volume={1996 June}, institution={Gloucester Point, VA: Virginia Institute of Marine Science}, author={Nelson, S. A. C.}, year={1996} }
 @inproceedings{nelson_1995, title={Wetland status and trends monitoring}, booktitle={Wetlands Workshop 1995 white papers}, publisher={Gloucester Point, VA: Virginia Institute of Marine Science}, author={Nelson, S. A. C.}, year={1995}, pages={1–10} }