HJ-1A THERMAL INFRARED BAND CROSS-CALIBRATION AND VALIDATION

HJ-1A satellite has been lunched in September, 2008. It is calibration and validation that the fundamental of quantitative utilization of HJ-1A IRS imagery. HJ-1A has only one channel in thermal infrared band, compared to MODIS sensor, which has two channels accordingly The key process of cross-calibration is band match, so this paper uses the MODIS SST product retrieval algorithm as reference for the difference of HJ-1A and MODIS thermal infrared channels characters. TIGR database were used as input parameters into radiative transfer mode Modtran4.0 to obtain band match coefficients by regression analysis. Number 711 similar to 1064 datum in TIGR database representing mid-latitude winter were chose according to the selected image's date Research demonstrates that cross-calibration method is effective to HJ-1A thermal infrared channel 4.