Block adjustment for CBERS-02B satellite images
CBERS-02B卫星遥感影像的区域网平差

In order to analyze the characteristic of large attitude angle errors of CBERS-02B satellite imagery, this paper proposesa specific strategy and algorithm to improve the point determination accuracy by using block adjustment. First, the errorsof attitude angles are calibrated according to four Ground Control Points (GCPs) around the four corners of each image. Then theRational Polynomial Coefficients (RPCs) of each imagery are solved using terrain-independent approach. The Rational FunctionModel (RFM) with the affine transformation parameters is applied for the bundle block adjustment of CBERS-02B satellite images.Two CBERS-02B stereo pairs in level 0 acquired by a single CCD are selected in our test. The experimental results haveshown that an accuracy of ±3 pixels can be attained both in plane and elevation. Moreover, the elevation accuracy is better thanthe planimetric accuracy. Comparing to the bundle block adjustment without pre-correction, the method proposed in this papercan improve the accuracy both in plane and elevation to a similar accuracy level of foreign High-resolution Satellite Images(HRSIs), which indicates that Chinese satellite images have good potential for geometric positioning. These experiments furthershow, the pre-correction before bundle block adjustment is necessary and feasible for the images in geometric processing.