Analysis of Geometric Performances of the Gaofen-6 WFV Camera
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The Gaofen-6 (GF-6) is a Chinese civilian optical satellite consisting of a 2/8 m resolution panchromatic/multispectral camera with an image swath of 90 km and a 16 m resolution wide angle camera with an 800 km swath width, and it was launched in June 2018. The geometric performances are an important basis for many applications, imaging geometry simulation, image geometric accuracy, band registration accuracy and elevation extraction accuracy were analyzed in this paper. Evaluation based on digital ortho-image map and digital surface model shows that the direct georeferencing accuracy is about one ground sample distance, and the image geometric accuracy is 0.5–1.0 pixels. According to the analysis of the tie points between eight bands, it is found that the root mean square error (RMSE) of the band registration is about 0.3 pixels. Preliminary tests on the WFV stereo model show that the elevation extraction accuracy of the across-track stereo is between 4 and 10 meters RMSE. In summary, the quantitative test, evaluation and analysis of the above geometrical properties show that the GF-6 WFV camera has excellent geometric performance.
KeywordsGaofen-6 WFV Geometric performances Accuracy Multi-spectral registration Stereo image-pair
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