In-flight method for CBERS-02 IRMSS thermal channel absolute radiometric calibration at Lake Qinghai (China)

In this paper, we describe the in-flight absolute radiometric calibration for the thermal channel of CBERS-02 IRMSS sensor using Lake Qinghai, water surface radiometric calibration site of China. The radiance of water surface measured by CE312, and then performed atmospheric correction including gas absorption and path radiance which calculated with atmospheric radiative transfer code MODTRAN 4.0; predict the radiance at the satellite sensor entrance pupil. At the same time the spectral response of satellite sensor and that of ground-based sensor are matched. At last the apparent radiance of sensor spectral band is compared to the digital counts of satellite's output to give the calibration coefficient. Keywordsin-flight calibration; spectral response match; radiative transfer calculation; CBERS-02 IRMSS; thermal channel

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