Acta Geodaetica et Cartographica Sinica ›› 2021, Vol. 50 ›› Issue (10): 1338-1348.doi: 10.11947/j.AGCS.2021.20210025

• Photogrammetry and Remote Sensing • Previous Articles     Next Articles

Processing and preliminary accuracy validation of the GF-7 satellite laser altimetry data

LI Guoyuan1,2,3, TANG Xinming1,2,3, CHEN Jiyi1, YAO Jiaqi1,2, LIU Zhao1, GAO Xiaoming1,3, ZUO Zhiqiang1, ZHOU Xiaoqing1   

  1. 1. Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China;
    2. College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China;
    3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
  • Received:2021-01-14 Revised:2021-03-24 Published:2021-11-09
  • Supported by:
    The National Natural Science Foundation of China (No. 41971425);The Special Fund for High Resolution Images Surveying and Mapping Application System (No. 42-Y30B04-9001-19/21)

Abstract: GF-7 satellite is equipped with the first full waveform laser altimeter of China for earth observation, which is mainly used to obtain sparse elevation control points on the ground, and ultimately improve the stereo mapping accuracy of stereo images without ground control points. The laser altimetry standardization processing of GF-7 satellite is the key step of surveying and mapping application, and the generated laser altimetry standard products are the important premise of subsequent distribution and application. Based on the GF-7 satellite laser altimetry data, this paper studies the method of laser altimetry data processing, and preliminarily validates the geometric accuracy of laser altimetry standard products. Three regions are selected to validate the accuracy of GF-7 satellite laser altimetry standard products, which contain the domestic geometric calibration area, Huayin of Shaanxi province, North Rhine-Westphalia of Germany. The results show that the planimetric accuracy of laser altimetry standard products SLA03 in calibration area is (3.896±1.029)m and (3.286±0.337)m, and elevation accuracy is (0.018±0.099)m,(-0.017±0.096)m in respectively for the two-beam lasers. Moreover, the elevation control point quality control parameter ECP_Flag can effectively identify the laser points that can be used for elevation control. The overall accuracy of Shaanxi Huayin area is (-0.113±2.519)m and (0.191±1.071)m, respectively for the two beams. The elevation accuracy of laser points marked with ECP_Flag=1 is (0.111±0.152)m and (-0.064±0.115)m. The overall accuracy of Norwich in Germany is (-0.897±5.485)m and (-0.202 ±6.207)m, and the elevation accuracy of laser points marked with ECP_Flag=1 is (-0.304±0.190)m and (-0.279±0.220)m, respectively for the two beams. At present, the laser altimetry standard products of GF-7 satellite have been daily produced in the Land Satellite Application Center of the Ministry of Natural Resources.

Key words: GF-7 satellite, satellite laser altimetry, standard product, accuracy validation, elevation control point

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