Works (66)

Updated: November 20th, 2024 15:25

2024 journal article

A multi-source change detection algorithm supporting user customization and near real-time deforestation detections

REMOTE SENSING OF ENVIRONMENT, 308.

By: I. Mcgregor*, G. Connette & J. Gray*

author keywords: Change detection; Near real time; Deforestation monitoring; Time series analysis; Optical-SAR comparison; Data harmonization
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
15. Life on Land (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: June 17, 2024

2024 review

Continuity between NASA MODIS Collection 6.1 and VIIRS Collection 2 land products

[Review of ]. REMOTE SENSING OF ENVIRONMENT, 302.

By: M. Roman*, C. Justice*, I. Paynter*, P. Boucher*, S. Devadiga*, A. Endsley*, A. Erb*, M. Friedl* ...

author keywords: MODIS; VIIRS; Continuity; Satellite; NASA
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science)
15. Life on Land (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: February 12, 2024

2024 article

Detecting Trajectories of Regime Shifts and Loss of Resilience in Coastal Wetlands using Remote Sensing

Martinez, M., Ardon, M., & Gray, J. (2024, October 31). ECOSYSTEMS, Vol. 10.

By: M. Martinez, M. Ardon* & J. Gray*

author keywords: Regime shifts; Freshwater; Forested wetlands; Early warning signals; Ghost forests; Coastal wetlands; Remote sensing
Sources: Web Of Science, NC State University Libraries
Added: November 12, 2024

2024 article

Drought Changes Growing Season Length and Vegetation Productivity

Gray, J., Choi, E., Friedl, M., & Griffiths, P. (2024, March 9).

By: J. Gray*, E. Choi, M. Friedl & P. Griffiths

Source: ORCID
Added: March 15, 2024

2024 article

From Satellites to Soil: Integrating Satellite and Household Survey Data to Assess the Impacts of Adaptations on Smallholder Farmers’ Climate Resilience

Hinks, I., & Gray, J. (2024, March 9).

By: I. Hinks n & J. Gray n

Source: ORCID
Added: March 15, 2024

2024 article

Overcoming Big Data Challenges in Satellite Observation: A Variable Resolution Scheme for Modeling Land Surface Phenology

Smith, O., Gao, X., & Gray, J. (2024, March 8).

By: O. Smith n, X. Gao* & J. Gray n

Source: ORCID
Added: March 15, 2024

2024 journal article

The role of rural circular migration in shaping weather risk management for smallholder farmers in India, Nepal, and Bangladesh

GLOBAL ENVIRONMENTAL CHANGE-HUMAN AND POLICY DIMENSIONS, 89.

By: D. Solomon, A. Ishtiaque, A. Agarwal, J. Gray*, M. Lemos, I. Moben, B. Singh, M. Jain

author keywords: Migration; Mobility; Rural livelihoods; Agriculture; Climate change
Sources: ORCID, Web Of Science, NC State University Libraries
Added: October 8, 2024

2024 article

Thermal Forcing Versus Chilling? Misspecification of Temperature Controls in Spring Phenology Models

Gao, X., Richardson, A. D., Friedl, M. A., Moon, M., & Gray, J. M. (2024, October 28). GLOBAL ECOLOGY AND BIOGEOGRAPHY, Vol. 10.

author keywords: chilling; phenology model; plant phenology; process-based model; spring leaf emergence; thermal forcing
Sources: Web Of Science, NC State University Libraries
Added: November 12, 2024

2024 article

Understanding the role of vegetation responses to drought in regulating autumn senescence

Choi, E., & Gray, J. (2024, March 9).

By: E. Choi & J. Gray*

Source: ORCID
Added: March 15, 2024

2023 article

Assessment of Performance of Tree-Based Algorithms to Reduce Errors of Omisssion and Commission in Change Detection

IGARSS 2023 - 2023 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM, pp. 6676–6679.

author keywords: change detection; broad area search; remote sensing; filtering; error of commission; random forest
TL;DR: A novel pixel-based broad area search (BAS) approach that detects and classifies heavy construction, which is an important indicator of human development and of interest to the intelligence community is presented. (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
15. Life on Land (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: March 25, 2024

2023 journal article

Machine learning approach for modeling daily pluvial flood dynamics in agricultural landscapes

ENVIRONMENTAL MODELLING & SOFTWARE, 167.

By: E. Fidan n, J. Gray n, B. Doll n & N. Nelson n

UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
Sources: Web Of Science, NC State University Libraries, ORCID
Added: June 30, 2023

2023 journal article

Observations of Satellite Land Surface Phenology Indicate That Maximum Leaf Greenness Is More Associated With Global Vegetation Productivity Than Growing Season Length

GLOBAL BIOGEOCHEMICAL CYCLES, 37(3).

By: X. Gao n, I. McGregor n, J. Gray n, M. Friedl* & M. Moon*

author keywords: remote sensing; land surface phenology; vegetation productivity; carbon cycle; climate change; GPP
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
15. Life on Land (Web of Science)
Sources: Web Of Science, NC State University Libraries, ORCID
Added: February 25, 2023

2022 journal article

Multiresolution Broad Area Search: Monitoring Spatial Characteristics of Gapless Remote Sensing Data

Journal of Data Science.

TL;DR: This work proposes monitoring multiresolution signals based on a wavelet decomposition to capture spatial change coherence on several scales to detect change sites and achieves site detection with less than two thirds of the monitoring processes required for pixel-wise roboBayes at the same resolution. (via Semantic Scholar)
Source: ORCID
Added: October 4, 2022

2022 journal article

Spatial Analysis of Forest Product Manufacturers in North Carolina

Forest Science, 69(1), 24–36.

By: O. Sodiya n, R. Parajuli n, R. Abt n & J. Gray n

author keywords: forest product manufacturers; clustering; hot spots analysis; economic development; forest resources
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID, Crossref
Added: December 18, 2022

2022 journal article

Using Deep Learning and Very-High-Resolution Imagery to Map Smallholder Field Boundaries

REMOTE SENSING, 14(13).

author keywords: field boundary delineation; Mask R-CNN; WorldView-3; smallholder farms; India
TL;DR: This work used very-high-resolution WorldView-3 satellite imagery and a mask region-based convolutional neural network (Mask R-CNN) to delineate smallholder field boundaries in Northeast India and found that the model performed equally well when applied to another site in India for which no data was used in the calibration step, suggesting that Mask R- CNN may be a generalizable way to map field boundaries at scale. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
13. Climate Action (Web of Science)
15. Life on Land (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: July 26, 2022

2021 journal article

Long-term, medium spatial resolution annual land surface phenology with a Bayesian hierarchical model

REMOTE SENSING OF ENVIRONMENT, 261.

By: X. Gao n, J. Gray n & B. Reich n

author keywords: Remote sensing; Land surface phenology; Landsat; Bayesian; Long-term; Medium resolution; Time series; Plant phenology; Data sparsity
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
15. Life on Land (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: June 14, 2021

2021 article

Multisensor fusion of remotely sensed vegetation indices using space-time dynamic linear models

Johnson, M. C., Reich, B. J., & Gray, J. M. (2021, May 21). JOURNAL OF THE ROYAL STATISTICAL SOCIETY SERIES C-APPLIED STATISTICS, Vol. 5.

By: M. Johnson n, B. Reich n & J. Gray n

author keywords: data fusion; dynamic linear models; remote sensing; spatiotemporal analysis
TL;DR: A space‐time dynamic linear model is proposed to fuse high temporal frequency data (MODIS) with high spatial resolution data (Landsat) to create high spatiotemporal resolution data products of a vegetation greenness index. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
15. Life on Land (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: June 10, 2021

2020 journal article

Continental-scale land surface phenology from harmonized Landsat 8 and Sentinel-2 imagery

REMOTE SENSING OF ENVIRONMENT, 240.

author keywords: Multi-sensor; Land surface phenology; Vegetation index; Image time series; Harmonized Landsat Sentinel
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
15. Life on Land (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: April 27, 2020

2020 journal article

Longer greenup periods associated with greater wood volume growth in managed pine stands

AGRICULTURAL AND FOREST METEOROLOGY, 297.

By: X. Gao n, J. Gray n, C. Cohrs n, R. Cook n & T. Albaugh*

Contributors: X. Gao n, J. Gray n, C. Cohrs n, R. Cook n & T. Albaugh*

author keywords: Land surface phenology; Forest productivity; Remote sensing; Time series; Competing vegetation
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
15. Life on Land (Web of Science)
Sources: Web Of Science, NC State University Libraries, ORCID
Added: November 15, 2020

2020 journal article

Mapping Understory Invasive Plants in Urban Forests with Spectral and Temporal Unmixing of Landsat Imagery

PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING, 86(8), 509–518.

By: K. Singh* & J. Gray*

UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
15. Life on Land (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: October 19, 2020

2020 journal article

Predictors of fire-tolerant oak and fire-sensitive hardwood distribution in a fire-maintained longleaf pine ecosystem

Forest Ecology and Management, 477, 118468.

By: D. Hannon n, C. Moorman n, A. Schultz, J. Gray n & C. DePerno n

author keywords: Longleaf pine; Pinus palustris; Oaks; Quercus spp; Fire-adapted hardwoods; Mast-dependent wildlife; Prescribed fire; Ecological restoration
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
15. Life on Land (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries, ORCID, Crossref
Added: November 24, 2020

2020 journal article

Sentinel-2 Leaf Area Index Estimation for Pine Plantations in the Southeastern United States

Remote Sensing, 12(9), 1406.

By: C. Cohrs n, R. Cook n, J. Gray n & T. Albaugh*

Contributors: C. Cohrs n, R. Cook n, J. Gray n & T. Albaugh*

author keywords: leaf area index; loblolly pine; forestry; site variability; forest site productivity; remote sensing; silviculture; stand density; support vector machine; supervised classification
TL;DR: Results indicate that Sentinel-2’s improved spatial resolution and temporal revisit interval provide new opportunities for managers to detect within-stand variance and improve accuracy for LAI estimation over current industry standard models. (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
15. Life on Land (Web of Science)
Sources: Web Of Science, Crossref, NC State University Libraries, ORCID
Added: July 20, 2020

2019 conference paper

A Land Surface Phenology Product for North America from Harmonized Landsat 8 and Sentinel-2 imagery

American Geophysical Union, Fall Meeting, B32E–05.

By: D. Bolton, E. Melaas, J. Gray, M. Moon, L. Eklundh & M. Friedl

Source: NC State University Libraries
Added: December 7, 2020

2019 journal article

An Empirical Assessment of the MODIS Land Cover Dynamics and TIMESAT Land Surface Phenology Algorithms

REMOTE SENSING, 11(19).

author keywords: Enhanced vegetation index (EVI); land surface phenology; MODIS; phenology product; smoothing methods; TIMESAT
TL;DR: The results suggest that TIMESAT is well-suited for local-to-regional scale studies because of its ability to tune algorithm parameters, which makes it more flexible than the MLCD product. (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
15. Life on Land (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: December 9, 2019

2019 conference paper

Climate controls on springtime phenology in Eastern Temperate Forests of North America

American Geophysical Union, Fall Meeting, B33K–2629.

By: M. Moon, B. Seyednasrollah, A. Richardson, J. Gray & M. Friedl

Source: NC State University Libraries
Added: December 7, 2020

2019 journal article

Hierarchical mapping of annual global land cover 2001 to present: The MODIS Collection 6 Land Cover product

REMOTE SENSING OF ENVIRONMENT, 222, 183–194.

By: D. Sulla-Menashe*, J. Gray n, S. Abercrombie* & M. Friedl*

author keywords: Global land cover; MODIS; Classification; Hidden Markov models
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
15. Life on Land (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: February 18, 2019

2019 journal article

Long-term continuity in land surface phenology measurements: A comparative assessment of the MODIS land cover dynamics and VIIRS land surface phenology products

REMOTE SENSING OF ENVIRONMENT, 226, 74–92.

author keywords: Land surface phenology; VIIRS; MODIS; Phenology product; Comparison; Validation
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
15. Life on Land (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: June 4, 2019

2019 report

PhenoCam Dataset v2. 0: Vegetation Phenology from Digital Camera Imagery, 2000-2018

In ORNL DAAC [Data set].

By: J. Gray (1 connected NC State author and many others, 119 authors in total )

Sources: NC State University Libraries, NC State University Libraries
Added: April 8, 2021

2019 conference paper

Web-based Decision Analytics For Mapping Host Species Distributions and Forecasting the Spread of Forest Pests and Pathogens

American Geophysical Union, Fall Meeting, IN52A–03.

By: N. Kruskamp, K. Singh, C. Jones, J. Gray & R. Meentemeyer

Source: NC State University Libraries
Added: December 7, 2020

2018 conference paper

Evaluating machine learning approaches for mapping flood risk

American Geophysical Union, Fall Meeting, H41M–2286.

By: Z. Zhang, K. Martin, J. Gray, K. Stevenson & Y. Yao

Source: NC State University Libraries
Added: December 7, 2020

2018 journal article

Evaluation of land surface phenology from VIIRS data using time series of PhenoCam imagery

AGRICULTURAL AND FOREST METEOROLOGY, 256, 137–149.

author keywords: Phenocam; VIIRS; Land surface phenology; Validation and evaluation
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
15. Life on Land (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2018 journal article

Intra-annual phenology for detecting understory plant invasion in urban forests

ISPRS Journal of Photogrammetry and Remote Sensing, 142, 151–161.

By: K. Singh n, Y. Chen n, L. Smart n, J. Gray n & R. Meentemeyer n

author keywords: Biological invasion; Vegetation indices; Vegetation phenology; Normalized difference vegetation index; Ligustrum sinense; Chinese privet; Random forest
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (OpenAlex)
13. Climate Action (Web of Science)
15. Life on Land (Web of Science)
Sources: Crossref, NC State University Libraries, ORCID
Added: February 24, 2020

2018 conference paper

Mapping Annual Land Cover and Phenology from MODIS: Global Data Sets Supporting Modeling and Global Change Science

American Geophysical Union, Fall Meeting, GC14B–08.

By: M. Friedl, D. Sulla-menashe & J. Gray

Source: NC State University Libraries
Added: December 8, 2020

2018 conference paper

Quantifying emerging infectious disease impacts on above ground biomass

American Geophysical Union, Fall Meeting, B14B–06.

By: N. Kruskamp, J. Gray & R. Meentemeyer

Source: NC State University Libraries
Added: December 8, 2020

2018 journal article

The managed clearing: An overlooked land-cover type in urbanizing regions?

PLOS ONE, 13(2).

By: K. Singh n, M. Madden*, J. Gray n & R. Meentemeyer n

MeSH headings : Conservation of Natural Resources / methods; Conservation of Natural Resources / statistics & numerical data; Ecosystem; Forests; Georgia; Maps as Topic; Natural Resources; North Carolina; United States; United States Department of Agriculture; Urbanization
TL;DR: This study reveals that managed clearings are the most common land cover type in these cities, covering 28% of the total sampled land area, 6.2% higher than the total area of impervious surfaces. (via Semantic Scholar)
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (OpenAlex)
13. Climate Action (Web of Science)
15. Life on Land (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2018 article

Tracking vegetation phenology across diverse North American biomes using PhenoCam imagery

Richardson, A. D., Hufkens, K., Milliman, T., Aubrecht, D. M., Chen, M., Gray, J. M., … Frolking, S. (2018, March 13). SCIENTIFIC DATA, Vol. 5.

MeSH headings : Climate Change; Databases, Factual; Ecosystem; Plants; Satellite Imagery; United States
TL;DR: A series of datasets, together consisting of almost 750 years of observations, characterizing vegetation phenology in diverse ecosystems across North America can be used for phenological model validation and development, evaluation of satellite remote sensing data products, benchmarking earth system models, and studies of climate change impacts on terrestrial ecosystems. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2018 conference paper

USA-NPN Observations Reveal the Ecological Relevance of Remotely Sensed Phenology

American Geophysical Union, Fall Meeting, B53C–05.

By: J. Gray, A. Khan & M. Friedl

Source: NC State University Libraries
Added: January 17, 2021

2017 journal article

Comparing Quantity, Allocation and Configuration Accuracy of Multiple Land Change Models

LAND, 6(3).

By: B. Pickard n, J. Gray n & R. Meentemeyer n

author keywords: land change; modeling; accuracy; urbanization
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2017 journal article

Exploration of scaling effects on coarse resolution land surface phenology

Remote Sensing of Environment, 190, 318–330.

By: X. Zhang*, J. Wang*, F. Gao*, Y. Liu*, C. Schaaf*, M. Friedl*, Y. Yu*, S. Jayavelu ...

author keywords: Land Surface Phonology; Scaling Effects; Spatial Heterogeneity; VIIRS; OLI
Sources: Crossref, NC State University Libraries
Added: February 24, 2020

2017 conference paper

Impacts of Extreme Flooding on Hydrologic Connectivity and Water Quality in the Atlantic Coastal Plain and Implications for Vulnerable Populations

American Geophysical Union, Fall Meeting. Washington, D.C.: American Geophysical Union.

By: D. Riveros-Iregui, H. Moser, E. Christenson, J. Gray, M. Hedgespeth, T. Jass, D. Lowry, K. Martin ...

Source: NC State University Libraries
Added: December 4, 2020

2017 report

PhenoCam Dataset v1. 0: Vegetation phenology from digital camera imagery, 2000–2015

In ORNL DAAC [Data set].

By: A. Richardson, K. Hufkens, T. Milliman, D. Aubrecht, M. Chen, J. Gray*, M. Johnston, T. Keenan ...

Sources: NC State University Libraries, NC State University Libraries
Added: April 8, 2021

2017 conference paper

Using Remote Sensing and Synthetic Controls to Understand Deforestation Drivers and their Moderation by Forest Use in Kalimantan, Indonesia

American Geophysical Union, Fall Meeting, GC52C–07.

By: J. Gray, E. Sills & M. Amanatides

Source: NC State University Libraries
Added: January 17, 2021

2017 conference paper

Water savings from reduced alfalfa cropping in California’s Upper San Joaquin Valley

American Geophysical Union, Fall Meeting, IN51F–0069.

By: K. Singh & J. Gray

Source: NC State University Libraries
Added: December 8, 2020

2016 journal article

A new seasonal-deciduous spring phenology submodel in the Community Land Model 4.5: impacts on carbon and water cycling under future climate scenarios

Global Change Biology, 22(11), 3675–3688.

author keywords: carbon cycle; climate change; Community Land Model; ecosystem services; PhenoCam; phenology; water
MeSH headings : Carbon; Climate; Forests; Seasons; Trees
TL;DR: The revised model substantially outperformed the standard CLM seasonal-deciduous spring phenology submodel and does a better job of representing recent (decadal) phenological trends observed globally by MODIS, as well as long-term trends in the PEP725 European phenology dataset. (via Semantic Scholar)
Sources: Crossref, NC State University Libraries
Added: September 16, 2020

2016 journal article

Multisite analysis of land surface phenology in North American temperate and boreal deciduous forests from Landsat

Remote Sensing of Environment, 186, 452–464.

author keywords: Landsat; Phenology; PhenoCam; Eddy covariance; Temperate forests; Boreal forests
Sources: Crossref, NC State University Libraries
Added: February 24, 2020

2016 conference paper

Multisource Image Kalman Filtering for Rapid Phenological Monitoring and Forecasting

American Geophysical Union, Fall Meeting Abstracts, B43B–0599. Washington, D.C.: American Geophysical Union.

By: J. Gray, M. Friedl & K. Singh

Source: NC State University Libraries
Added: January 17, 2021

2016 conference paper

Validation of VIIRS Land Surface Phenology using Field Observations, PhenoCam Imagery, and Landsat data.

American Geophysical Union, Fall Meeting Abstracts, B33J–06. Washington, D.C.: American Geophysical Union.

By: X. Zhang, S. Jayavelu, J. Wang, G. Henebry, J. Gray, M. Friedl, Y. Liu, C. Schaaf, A. Shuai

Source: NC State University Libraries
Added: January 17, 2021

2015 conference paper

Incorporating phenology into yield models

American Geophysical Union, Fall Meeting Abstracts, B43A–0540. Washington, D.C.: American Geophysical Union.

By: J. Gray & M. Friedl

Source: NC State University Libraries
Added: January 17, 2021

2015 conference paper

Using three decades of Landsat data to characterize changes and vulnerability of temperate and boreal forest phenology to climate change

American Geophysical Union, Fall Meeting Abstracts, B21G–0548. Washington, D.C.: American Geophysical Union.

By: E. Melaas, D. Sulla-menashe, J. Gray & M. Friedl

Source: NC State University Libraries
Added: January 17, 2021

2014 journal article

A tale of two springs: using recent climate anomalies to characterize the sensitivity of temperate forest phenology to climate change

Environmental Research Letters, 9(5), 054006.

By: M. Friedl*, J. Gray*, E. Melaas*, A. Richardson*, K. Hufkens*, T. Keenan*, A. Bailey*, J. O’Keefe*

author keywords: climate change; temperate forests; phenology
UN Sustainable Development Goal Categories
13. Climate Action (OpenAlex)
Sources: Crossref, NC State University Libraries
Added: September 16, 2020

2014 journal article

Direct human influence on atmospheric CO2 seasonality from increased cropland productivity

Nature, 515(7527), 398–401.

MeSH headings : Agriculture / statistics & numerical data; Atmosphere / chemistry; Biomass; Carbon Dioxide / analysis; Carbon Dioxide / metabolism; Crops, Agricultural / growth & development; Crops, Agricultural / metabolism; Ecosystem; Efficiency; Human Activities; Seasons
TL;DR: Production statistics and a carbon accounting model are used to show that increases in agricultural productivity, which have been largely overlooked in previous investigations, explain as much as a quarter of the observed changes in atmospheric CO2 seasonality. (via Semantic Scholar)
Sources: Crossref, NC State University Libraries
Added: September 9, 2020

2014 journal article

Evaluating remote sensing of deciduous forest phenology at multiple spatial scales using PhenoCam imagery

Biogeosciences, 11(16), 4305–4320.

By: S. Klosterman*, K. Hufkens*, J. Gray*, E. Melaas*, O. Sonnentag*, I. Lavine*, L. Mitchell*, R. Norman*, M. Friedl*, A. Richardson*

UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Sources: Crossref, NC State University Libraries
Added: September 16, 2020

2014 conference paper

Increased carbon uptake in the eastern US due to warming induced changes in phenology

European Geosciences Union General Assembly Abstracts, 16. Munchen: European Geosciences Union.

By: T. Keenan, G. Bohrer, M. Friedl, J. Gray, D. Hollinger, J. Munger, H. Schmid, M. Toomey ...

Event: European Geosciences Union, General Assembly at Vienna, Austria on April 7-12, 2013

Source: NC State University Libraries
Added: January 17, 2021

2014 journal article

Mapping Asian Cropping Intensity With MODIS

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 7(8), 3373–3379.

By: J. Gray*, M. Friedl*, S. Frolking*, N. Ramankutty*, A. Nelson* & M. Gumma*

author keywords: Agriculture; remote sensing; time series
TL;DR: While the algorithm highlighted the dominant continental-scale patterns in agricultural practices throughout Asia, and produced reasonable estimates of state and provincial level total harvested areas, field-scale assessment revealed significant challenges in mapping high cropping intensity due to abundant missing data. (via Semantic Scholar)
Sources: Crossref, NC State University Libraries
Added: September 16, 2020

2014 journal article

Mapping Crop Cycles in China Using MODIS-EVI Time Series

Remote Sensing, 6(3), 2473–2493.

author keywords: phenology cycles; land cover; land use; planted area; gross sown area; cropping intensity
TL;DR: This study presents a simple but efficient algorithm for automated mapping of cropping intensity based on data from NASA's MODIS, which applies an adaptive Savitzky-Golay filter to smooth Enhanced Vegetation Index time series derived from MODIS surface reflectance data. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
Sources: Crossref, NC State University Libraries
Added: September 16, 2020

2014 journal article

Net carbon uptake has increased through warming-induced changes in temperate forest phenology

Nature Climate Change, 4(7), 598–604.

Sources: Crossref, NC State University Libraries
Added: September 9, 2020

2014 conference paper

Standardizing PhenoCam Image Processing and Data Products

American Geophysical Union, Fall Meeting Abstracts, B41K–019. Washington, D.C.: American Geophysical Union.

By: T. Milliman, A. Richardson, S. Klosterman, J. Gray, K. Hufkens, D. Aubrecht, M. Chen, M. Friedl

Source: NC State University Libraries
Added: January 17, 2021

2014 conference paper

Using Time Series of Landsat Data to Improve Understanding of Short-and Long-Term Changes to Vegetation Phenology in Response to Climate Change

American Geophysical Union, Fall Meeting Abstracts. Washington, D.C.: American Geophysical Union.

By: M. Friedl, E. Melaas, D. Sulla-menashe & J. Gray

Source: NC State University Libraries
Added: January 17, 2021

2013 journal article

Consistent classification of image time series with automatic adaptive signature generalization

Remote Sensing of Environment, 134, 333–341.

By: J. Gray* & C. Song*

author keywords: Land cover; Classification; Signature extension; Landsat; LCLUC
TL;DR: The automatic adaptive signature generalization procedure (AASG) adapts class spectral signatures to individual images and therefore requires no image correction procedure, and offers significant advantages over traditional signature extension, particularly for temporally irregular time series. (via Semantic Scholar)
Sources: Crossref, NC State University Libraries
Added: September 9, 2020

2013 conference paper

Large scale maps of cropping intensity in Asia from MODIS

American Geophysical Union, Fall Meeting Abstracts, B41A–0385. Washington, D.C.: American Geophysical Union.

By: J. Gray, M. Friedl, S. Frolking, N. Ramankutty & A. Nelson

Source: NC State University Libraries
Added: January 17, 2021

2012 conference paper

A comparison of phenophase transition dates calculated from MODIS EVI and NBAR-EVI

American Geophysical Union, Fall Meeting Abstracts, B11C–0438. Washington, D.C.: American Geophysical Union.

By: E. Frick, M. Friedl, E. Melaas & J. Gray

Source: NC State University Libraries
Added: January 17, 2021

2012 journal article

Mapping leaf area index using spatial, spectral, and temporal information from multiple sensors

Remote Sensing of Environment, 119, 173–183.

By: J. Gray* & C. Song*

author keywords: Leaf area index; Multi-sensor fusion; Phenology; Landsat; MODIS
Sources: Crossref, NC State University Libraries
Added: September 9, 2020

2012 conference paper

PhenoCam: A Continental Observatory in Support of Monitoring, Modeling, and Forecasting Phenological Responses to Climate Change

American Geophysical Union, Fall Meeting Abstracts, GC54A–06. Washington, D.C.: American Geophysical Union.

By: M. Friedl, A. Richardson, R. Pless, S. Frolking, T. Milliman, S. Klosterman, M. Toomey, J. Gray

Source: NC State University Libraries
Added: January 17, 2021

2012 thesis

Understanding regional water resource dynamics due to land-cover/land-use and climate changes in the North Carolina Piedmont

(Doctoral Dissertation, University of North Carolina-Chapel Hill).

By: J. Gray

Sources: NC State University Libraries, NC State University Libraries
Added: January 17, 2021

2011 chapter

Remote Sensing of Vegetation with Landsat Imagery

In Advances in Environmental Remote Sensing (pp. 3–29).

By: C. Song, J. Gray* & F. Gao

Sources: Crossref, NC State University Libraries
Added: September 16, 2020

2008 conference paper

Retrieving LAI from Remotely Sensed Images: Spectral Indices vs Spatial Texture

American Geophysical Union, Fall Meeting Abstracts, B33D–03. Washington, D.C.: American Geophysical Union.

By: C. Song, J. Gray & S. Zhang

Source: NC State University Libraries
Added: January 17, 2021

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