On-orbit Radiometric Calibration Method of Spaceborne Multi-camera Mosaic Imaging Sensor

doi:10.11947/j.AGCS.2017.20170071

Abstract

Abstract:

As the core and foundation of quantitative remote sensing, the precision of on-orbit radiometric calibration of spaceborne sensor directly determines the quality of quantitative remote sensing production. However, the available radiometric calibration methods have been unable to achieve the absolute radiometric calibration of each camera and the relative radiometric correction among cameras simultaneously for multi-camera mosaic imaging sensor. Therefore,taking wide field of view(WFV)multispectral sensor equipped with GF-1 satellite as example,this research proposes an innovative on-orbit radiometric calibration method based on the modified radiometric block adjustment. First,the radiometric control points of each WFV camera are extracted using the traditional cross calibration method. Then the radiometric tie points of adjacent WFV cameras in the overlapping regions are obtained. At last,the integrate adjustment method is used to calculate the calibration coefficients of each WFV camera and the parameters of radiometric constraint equation considering the coupling relationship between the relative radiometric correction and the absolute radiometric calibration. The experimental results show the relative errors of the absolute radiometric calibration coefficients in each band are all less 9.34%. Meanwhile,the absolute radiometric calibration coefficients can realize relative radiometric correction among WFV cameras. The average absolute values of top of atmosphere (TOA) radiance differences in the overlapping region of adjacent cameras in each band are all less 1.63 W·m^-2·sr^-1·μm^-1.

Key words: on-orbit radiometric calibration, multi-camera mosaic imaging, radiometric block adjustment, validation and evaluation

CLC Number:

P237

HAN Jie, XIE Yong. On-orbit Radiometric Calibration Method of Spaceborne Multi-camera Mosaic Imaging Sensor[J]. Acta Geodaetica et Cartographica Sinica, 2017, 46(11): 1830-1840.

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