Evaluation of MODIS NPP and GPP products across multiple biomes
Estimates of daily gross primary production (GPP) and annual net primary production (NPP) at the 1 km spatial resolution are now produced operationally for the global terrestrial surface using imagery from the MODIS (Moderate Resolution Imaging Spectroradiometer) sensor. Ecosystem-level measurements...
Published in: | Remote Sensing of Environment |
---|---|
Main Authors: | , , , , , , , , , , |
Format: | Text |
Language: | unknown |
Published: |
ScholarWorks at University of Montana
2006
|
Subjects: | |
Online Access: | https://scholarworks.umt.edu/ntsg_pubs/171 https://doi.org/10.1016/j.rse.2006.02.017 |
id |
ftunivmontana:oai:scholarworks.umt.edu:ntsg_pubs-1170 |
---|---|
record_format |
openpolar |
spelling |
ftunivmontana:oai:scholarworks.umt.edu:ntsg_pubs-1170 2024-09-09T19:27:22+00:00 Evaluation of MODIS NPP and GPP products across multiple biomes Turner, David Ritts, William D. Cohen, Warren B. Gower, Stith T. Running, Steven W Zhao, Maosheng Costa, Marcos H. Kirschbaum, Al A. Ham, Jay M. Saleska, Scott R. Ahl, Douglas E. 2006-06-01T07:00:00Z application/pdf https://scholarworks.umt.edu/ntsg_pubs/171 https://doi.org/10.1016/j.rse.2006.02.017 unknown ScholarWorks at University of Montana https://scholarworks.umt.edu/ntsg_pubs/171 doi:10.1016/j.rse.2006.02.017 © 2006 Elsevier Numerical Terradynamic Simulation Group Publications Biomes Global gross primary production Landsat MODIS Monitoring Net primary production validation text 2006 ftunivmontana https://doi.org/10.1016/j.rse.2006.02.017 2024-06-20T05:32:53Z Estimates of daily gross primary production (GPP) and annual net primary production (NPP) at the 1 km spatial resolution are now produced operationally for the global terrestrial surface using imagery from the MODIS (Moderate Resolution Imaging Spectroradiometer) sensor. Ecosystem-level measurements of GPP at eddy covariance flux towers and plot-level measurements of NPP over the surrounding landscape offer opportunities for validating the MODIS NPP and GPP products, but these flux measurements must be scaled over areas on the order of 25 km2 to make effective comparisons to the MODIS products. Here, we report results for such comparisons at 9 sites varying widely in biome type and land use. The sites included arctic tundra, boreal forest, temperate hardwood forest, temperate conifer forest, tropical rain forest, tallgrass prairie, desert grassland, and cropland. The ground-based NPP and GPP surfaces were generated by application of the Biome-BGC carbon cycle process model in a spatially-distributed mode. Model inputs of land cover and leaf area index were derived from Landsat data. The MODIS NPP and GPP products showed no overall bias. They tended to be overestimates at low productivity sites — often because of artificially high values of MODIS FPAR (fraction of photosynthetically active radiation absorbed by the canopy), a critical input to the MODIS GPP algorithm. In contrast, the MODIS products tended to be underestimates in high productivity sites — often a function of relatively low values for vegetation light use efficiency in the MODIS GPP algorithm. A global network of sites where both NPP and GPP are measured and scaled over the local landscape is needed to more comprehensively validate the MODIS NPP and GPP products and to potentially calibrate the MODIS NPP/GPP algorithm parameters. Text Arctic Tundra University of Montana: ScholarWorks Arctic Remote Sensing of Environment 102 3-4 282 292 |
institution |
Open Polar |
collection |
University of Montana: ScholarWorks |
op_collection_id |
ftunivmontana |
language |
unknown |
topic |
Biomes Global gross primary production Landsat MODIS Monitoring Net primary production validation |
spellingShingle |
Biomes Global gross primary production Landsat MODIS Monitoring Net primary production validation Turner, David Ritts, William D. Cohen, Warren B. Gower, Stith T. Running, Steven W Zhao, Maosheng Costa, Marcos H. Kirschbaum, Al A. Ham, Jay M. Saleska, Scott R. Ahl, Douglas E. Evaluation of MODIS NPP and GPP products across multiple biomes |
topic_facet |
Biomes Global gross primary production Landsat MODIS Monitoring Net primary production validation |
description |
Estimates of daily gross primary production (GPP) and annual net primary production (NPP) at the 1 km spatial resolution are now produced operationally for the global terrestrial surface using imagery from the MODIS (Moderate Resolution Imaging Spectroradiometer) sensor. Ecosystem-level measurements of GPP at eddy covariance flux towers and plot-level measurements of NPP over the surrounding landscape offer opportunities for validating the MODIS NPP and GPP products, but these flux measurements must be scaled over areas on the order of 25 km2 to make effective comparisons to the MODIS products. Here, we report results for such comparisons at 9 sites varying widely in biome type and land use. The sites included arctic tundra, boreal forest, temperate hardwood forest, temperate conifer forest, tropical rain forest, tallgrass prairie, desert grassland, and cropland. The ground-based NPP and GPP surfaces were generated by application of the Biome-BGC carbon cycle process model in a spatially-distributed mode. Model inputs of land cover and leaf area index were derived from Landsat data. The MODIS NPP and GPP products showed no overall bias. They tended to be overestimates at low productivity sites — often because of artificially high values of MODIS FPAR (fraction of photosynthetically active radiation absorbed by the canopy), a critical input to the MODIS GPP algorithm. In contrast, the MODIS products tended to be underestimates in high productivity sites — often a function of relatively low values for vegetation light use efficiency in the MODIS GPP algorithm. A global network of sites where both NPP and GPP are measured and scaled over the local landscape is needed to more comprehensively validate the MODIS NPP and GPP products and to potentially calibrate the MODIS NPP/GPP algorithm parameters. |
format |
Text |
author |
Turner, David Ritts, William D. Cohen, Warren B. Gower, Stith T. Running, Steven W Zhao, Maosheng Costa, Marcos H. Kirschbaum, Al A. Ham, Jay M. Saleska, Scott R. Ahl, Douglas E. |
author_facet |
Turner, David Ritts, William D. Cohen, Warren B. Gower, Stith T. Running, Steven W Zhao, Maosheng Costa, Marcos H. Kirschbaum, Al A. Ham, Jay M. Saleska, Scott R. Ahl, Douglas E. |
author_sort |
Turner, David |
title |
Evaluation of MODIS NPP and GPP products across multiple biomes |
title_short |
Evaluation of MODIS NPP and GPP products across multiple biomes |
title_full |
Evaluation of MODIS NPP and GPP products across multiple biomes |
title_fullStr |
Evaluation of MODIS NPP and GPP products across multiple biomes |
title_full_unstemmed |
Evaluation of MODIS NPP and GPP products across multiple biomes |
title_sort |
evaluation of modis npp and gpp products across multiple biomes |
publisher |
ScholarWorks at University of Montana |
publishDate |
2006 |
url |
https://scholarworks.umt.edu/ntsg_pubs/171 https://doi.org/10.1016/j.rse.2006.02.017 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Tundra |
genre_facet |
Arctic Tundra |
op_source |
Numerical Terradynamic Simulation Group Publications |
op_relation |
https://scholarworks.umt.edu/ntsg_pubs/171 doi:10.1016/j.rse.2006.02.017 |
op_rights |
© 2006 Elsevier |
op_doi |
https://doi.org/10.1016/j.rse.2006.02.017 |
container_title |
Remote Sensing of Environment |
container_volume |
102 |
container_issue |
3-4 |
container_start_page |
282 |
op_container_end_page |
292 |
_version_ |
1809896803240247296 |