HR: 14:40h
AN: B43E-05    [Abstracts]
TI: Comparative Analysis of AVHRR and MODIS NDVI Time Series for Developing Long Term Records of Terrestrial Vegetation
AU: * Dwyer, J L
EM: dwyer@usgs.gov
AF: SAlC, USGS EROS, Sioux Falls, SD 57198 United States
AU: Reed, B
EM: reed@usgs.gov
AF: SAlC, USGS EROS, Sioux Falls, SD 57198 United States
AU: Gallo, K
EM: kgallo@usgs.gov
AF: NOAA, USGS EROS, Sioux Falls, SD 57198 United States
AU: Ji, L
EM: lji@usgs.gov
AF: Colorado State University, USGS EROS, Sioux Falls, SD 57198 United States
AU: Eidenshink, J
EM: eidenshink@usgs.gov
AF: USGS, USGS EROS, Sioux Falls, SD 57198 United States
AB: Long-term continuity of the moderate resolution satellite data record is critical for monitoring changes in vegetation activity and other land surface properties. The moderate resolution data record began with the Advanced Very High Resolution Radiometer (AVHRR) in the 1980s and will eventually evolve to the Visible/Infrared Imager/Radiometer Suite (VIIRS). The VIIRS will be similar to the Moderate Resolution Imaging Spectroradiometer (MODIS) onboard the EOS platforms. The USGS Center for Earth Resources and Observation Science (EROS) has created a contemporaneous data set of AVHRR and MODIS vegetation indices from 2001 through 2003 in order to characterize and evaluate differences in the normalized difference vegetation index (NDVI) derived from both sensors. The comparison data sets consist of 16-day composites of NDVI data at 1 km resolution for the conterminous USA. Initial results of the comparisons indicate that the AVHRR derived NDVI data were associated with 89 percent or more of the variation in the MODIS NDVI values when land cover types were combined. Specific land cover types (e.g., several forest classes) exhibited lower r2 values. Generally, the initial results suggest that historical AVHRR NDVI values may be reprocessed to provide continuity of NDVI values through future sensor systems.
DE: 0434 Data sets
SC: Biogeosciences [B]
MN: Fall Meeting 2005