HR: 1340h
AN: A23A-0929    [Abstracts]
TI: Comparison of Atmospheric Correction Results for AVHRR, VGT and MODIS Reflective Bands Used for Land Applications
AU: Luo, Y P
EM: yi.luo@ccrs.nrcan.gc.ca
AF: Canada Centre for Remote Sensing, Natural Resources Canada, 588 Booth Str, Ottawa, ONT K1A 0Y7 Canada
AU: * Trishchenko, A
EM: trichtch@ccrs.nrcan.gc.ca
AF: Noetix Research Inc. (Under contract with CCRS), 265 Carling Ave. Suite 403, Ottawa, ONT K1S 2E1 Canada
AB: The extensive archive of satellite observations derived from AVHRR, VGT and MODIS sensors have been collected in our project to study the surface albedo/ bi-directional reflectance distribution function (BRDF) properties over the Southern Great Plains (SGP) region. To be suitable for this purpose, the raw satellite data must be calibrated and atmospherically corrected. These procedures for the VGT and MODIS sensors have been applied by satellite data providers: VITO and NASA. We applied our own technique developed at the Canada Centre for Remote Sensing (CCRS) to perform these functions for the AVHRR data. The CCRS-developed technique for AVHRR processing employs NOAA- recommended calibration coefficients and analytical parameterization for atmospheric correction tuned to MODTRAN4 full scale radiative transfer computations. Atmospheric correction scheme developed at CCRS is also suitable for correction of MODIS and VGT spectral channels. Comparison of surface reflectances, BRDF and albedo results showed that there are some systematic seasonal differences between similar spectral channels for above sensors. For example, MODIS near-infrared (NIR) channel 2 shows systematically larger surface reflectance than VGT and AVHRR NIR channels by up to 20 percents, especially in the summer. After applying adjustment for the spectral response function effect, the differences were slightly reduced but not eliminated. Careful analysis of the results showed that the above differences can be attributed to the differences in atmospheric correction schemes and atmospheric parameters employed. Details of the comparisons will be presented and approach for achieving consistent results will be discussed.
UR: http://ftp.ccrs.nrcan.gc.ca/ad/CCRS_ARM/Satellites/
DE: 0360 Radiation: transmission and scattering
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005