High precision geometric rectification of HJ-1A/B CCD imagery based on satellite observation angle information
Liang YANG1(), Yi JIA2, Wanshou JIANG1(), Guo ZHANG1
1.State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing,Wuhan University,Wuhan 430079, China 2.Chang Guang Satellite Technology Co., Ltd., Changchun 130000, China
The available standard products of the domestic satellite HJ-1A/B CCD image are level II images, which are generated with systematic correction without considering the distortions caused by terrain undulation. Lacking of the geometric imaging model, it is difficult to do a reliable image rectification on the level II image with the existing methods in the range with big terrain undulation. To solve this problem, the authors propose a method to reconstruct the imaging geometric model based on the observation angle information, which is stored in a SatAngle.txt file. With the reconstructed RPC model, the HJ-1A/B CCD image can be orthorectified just like an original image with rigorous imaging geometric model. The experimental results show that the proposed method can effectively improve the rectification precision and the stability of geometric model fitting.
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2018, Vol. 30 
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