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Generating a Long-Term Land Data Record from the AVHRR and MODIS InstrumentsThe goal of NASA's Land Long Term Iiata Record (LTDR) project is to produce a consistent long term data set from the AVHRR and MODIS instruments for land climate studies. The project will create daily surface reflectance and normalized difference vegetation index (NDVI) products at a resolution of 0.05 deg., which is identical to the Climate Modeling Grid (CMG) used for MODIS products from EOS Terra and Aqua. Higher order products such as burned area, land surface temperature, albedo, bidirectional reflectance distribution function (BRDF) correction, leaf area index (LAI), and fraction of photosyntheticalIy active radiation absorbed by vegetation (fPAR), will be created. The LTDR project will reprocess Global Area Coverage (GAC) data from AVHRR sensors onboard NOAA satellites by applying the preprocessing improvements identified in the AVHRR Pathfinder Il project and atmospheric and BRDF corrections used in MODIS processing. The preprocessing improvements include radiometric in-flight vicarious calibration for the visible and near infrared channels and inverse navigation to relate an Earth location to each sensor instantaneous field of view (IFOV). Atmospheric corrections for Rayleigh scattering, ozone, and water vapor are undertaken, with aerosol correction being implemented. The LTDR also produces a surface reflectance product for channel 3 (3.75 micrometers). Quality assessment (QA) is an integral part of the LTDR production system, which is monitoring temporal trands in the AVHRR products using time-series approaches developed for MODIS land product quality assessment. The land surface reflectance products have been evaluated at AERONET sites. The AVHRR data record from LTDR is also being compared to products from the PAL (Pathfinder AVHRR Land) and GIMMS (Global Inventory Modeling and Mapping Studies) systems to assess the relative merits of this reprocessing vis-a-vis these existing data products. The LTDR products and associated information can be found at http://ltdr.nascom.nasa.gov/ltdr/ltdr.html.
Document ID
20070034809
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Pedelty, Jeffrey
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Devadiga, Sadashiva
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Masuoka, Edward
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Brown, Molly
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Pinzon, Jorge
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Tucker, Compton
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Vermote, Eric
(Maryland Univ. College Park, MD, United States)
Prince, Stephen
(Maryland Univ. College Park, MD, United States)
Nagol, Jyotheshwar
(Maryland Univ. College Park, MD, United States)
Justice, Christopher
(Maryland Univ. College Park, MD, United States)
Roy, David
(South Dakota State Univ. Brookings, SD, United States)
Ju, Junchang
(South Dakota State Univ. Brookings, SD, United States)
Schaaf, Crystal
(Boston Univ. Boston, MA, United States)
Liu, Jicheng
(Boston Univ. Boston, MA, United States)
Privette, Jeffrey
(National Oceanic and Atmospheric Administration Asheville, NC, United States)
Pincheiro, Ana
(National Oceanic and Atmospheric Administration Asheville, NC, United States)
Date Acquired
August 24, 2013
Publication Date
July 23, 2007
Subject Category
Earth Resources And Remote Sensing
Meeting Information
Meeting: International Geoscience and Remote Sensing Symposium (IGARSS) ''07
Location: Barcelona
Country: Spain
Start Date: July 23, 2007
End Date: July 27, 2007
Distribution Limits
Public
Copyright
Other

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