Elevation error checking of stereo mapping satellite based on LoFTR and adaptive IRLS

doi:10.13474/j.cnki.11-2246.2023.0037

Abstract

Abstract: The mapping accuracy of stereoscopic surveying and mapping satellite is affected by many factors. Quality of the surveying and mapping products can be effectively ensured by adopting precise and comprehensive measurements of the plane elevation error on the butt side of the stereoscopic images using certain technical means, while possible image distortions and anomalies inside can be filtered. In this paper, a method for checking the elevation edge error of stereo mapping satellites is proposed. Firstly, a large number of high-precision matching points can be obtained by feature matching of overlapping out-of-orbit stereo satellite image pairs through LoFTR, and screen for the matching point of forward intersection simultaneously. Figure out the elevation edge error of this position. Then, use the adaptive IRLS method to robustly estimate the average value of the elevation edge difference corresponding to the matching point in a single area. Finally, the reliable result can be obtained by screening out the inspection result outliers. By evaluating the experiment results of the ZY-3 and Gaofen-7 stereo pair, it is proved that the accuracy level achieved by the method is sufficient to meet the accuracy requirements of the elevation error inspection of stereo mapping satellites, and the effectiveness of the method has been validated too.

Key words: LoFTR, feature matching, adaptive IRLS, robust estimation, elevation error check

CLC Number:

P237

GUO Haoyu, LIU Qiang, WAN Yi. Elevation error checking of stereo mapping satellite based on LoFTR and adaptive IRLS[J]. Bulletin of Surveying and Mapping, 2023, 0(2): 34-39.

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