On orbit radiometric calibration means relative radiometric calibration and absolute radiometric calibration

it is a critical process and important method for improving the resolution of quantitative study of remote sensing data.In this paper

methods and principles of regional synthesized uniform field based relative radiometric calibration and albedo based absolute radiometric calibration

are introduced.It is the first time to use the above methods for the calibration of the three cameras such as high resolution camera

high multispectral camera and triplet linear array camera on Mapping Satellite-1.Results show that

the braid noise is removed effectively by the process of relative radiometric calibration.Then

the absolute radiometric calibration for Mapping Satellite-1 sensors are also performed through Dunhuang field radiation target

the atmospheric parameters and the ground object spectral reflectivity.Results show that

the difference between the reflectivity of ground object obtained by the satellite sensors and that of field measured value is less than 5%

which demonstrated the effectiveness of on orbit radiometric calibration coefficient.