ATMOSPHERIC CORRECTION OF VISIBLE TO MIDDLE-INFRARED OF EOS-MODIS DATA OVER LAND SURFACES BY USING 6S MODEL

Atmospheric correction of visible to middle-infrared of MODIS data over land surfaces is done using 6S model. There are two processes of the correction, first, objective is assumed as the Lambertan surface, then bi-directional BRDF model Roujean is operated. Comparing the corrected result with the MODIS airborne simulator (MAS) which MODIS research group using in experiment, the result shows that there is consistency characteristic on their variety trends. The reflectance of near-infrared band 2 and blue band 3 are falling, but the red spectral band 1 is rising by operating atmosphere corrected. I_NDV is higher and Iev is lower after atmosphere is corrected, the largest value of variety are 0.104 and 0.005.