On-orbit geometric calibration and accuracy verification of GF-6 WFV camera

doi:10.11947/j.AGCS.2020.20190265

Abstract

Abstract: The wide field of view(WFV) camera on GF-6 satellite can achieve the swath width up to 800 km by single camera, which has unique advantages for large-scale surface observation and environmental monitoring. On-orbit geometric calibration is a key technology of optical remote sensing satellite geometric processing, and directly affects the geometric quality of images. Considering the distortion characteristics of the ultra-large field of view and the imaging characteristics of multi-spectral bands for WFV camera, this paper proposes a method of on-orbit geometric calibration for WFV camera. The system errors of WFV camera are compensated by a geometric calibration model based on detector direction angle, and the calibration parameters of each band are estimated jointly by absolute calibration and relative calibration methods. Using Landsat 8 digital orthophoto image, ZY-3 digital surface modeland ASTER GDEM as reference data, the absolute calibration and relative calibration of WFV camera are processed. The geometric calibration results show that the absolute positioning accuracy of WFV image is about 3 pixels, the internal geometric accuracy is within 1 pixel, and the band-to-band registration accuracy is better than 0.3 pixels, which show that the geometric quality of GF-6 WFV camera has been significantly improved after on-orbit geometric calibration.

Key words: WFV camera, absolute calibration, relative calibration, positioning accuracy, registration accuracy

CLC Number:

P237

WANG Mi, GUO Beibei, LONG Xiaoxiang, XUE Lin, CHENG Yufeng, JIN Shuying, ZHOU Xiao. On-orbit geometric calibration and accuracy verification of GF-6 WFV camera[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(2): 171-180.

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