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Laser altimetry data-aided satellite geometry model refined processing

  • role： First author第一作者
  • Affiliation：

    Satellite Surveying and Mapping Application Center, National Administration of Surveying, Mapping and Geoinformation, Beijing 100048, China

  • Email：lzjt_michael@126.com
  • Introduction：曹宁，1988年生，男，工程师，研究方向为航空航天摄影测量处理。E-mail：lzjt_michael@126.com
Ning CAO,  
  • Affiliation：

    Satellite Surveying and Mapping Application Center, National Administration of Surveying, Mapping and Geoinformation, Beijing 100048, China

Ping ZHOU,  
  • Affiliation：

    Satellite Surveying and Mapping Application Center, National Administration of Surveying, Mapping and Geoinformation, Beijing 100048, China

Xia WANG,  
  • Affiliation：

    Satellite Surveying and Mapping Application Center, National Administration of Surveying, Mapping and Geoinformation, Beijing 100048, China

Xinming TANG,  
  • Affiliation：

    Satellite Surveying and Mapping Application Center, National Administration of Surveying, Mapping and Geoinformation, Beijing 100048, China

Guoyuan LI

résumé

ZiYuan3-02 (ZY3-02), which was launched on May 30, 2016, is the second satellite in the ZiYuan3 series and is mainly used for developing China’s civil space infrastructure. A laser altimeter, a core payload in ZY3-02, is China’s first earth observation laser altimeter experimental instrument. Evaluation accuracy is a crucial factor in stereoscopic mapping and is occasionally even more difficult to improve than a planar. In the conventional block adjustment combined with the increasing accuracy of laser altimeter data and the characteristics of laser altimetry data in the ZY3-02 satellite, in this study, we proposed a geometric imaging model refinement general theory of satellite stereo images aided with the laser altimeter data. First, high-precision tie point matching in the conventional block and free network adjustments without constraints were conducted to obtain a high-precision relative accuracy and absolute precision, which was not worse than that in the original imaging geometric model; second, in accordance with the 3D coordinates of the laser altimetry data and refined imaging geometric model of reference data, the reference image point coordinates could be acquired. These coordinates were used to map the target image point coordinates using the geometric model, and high-precision homonymous image points could be determined in the target images after a refinement process through the tie point matching algorithm; finally, the block adjustment with the homonymous points as elevation controls was performed to further process the imaging geometry model and compute high-precision compensation parameters. The experiments in Hubei and Qinghai showed that the elevation accuracy of the satellite geometry model refined by altimeter data can reach 1.97 and 3.23 m, correspondingly. The comparison experiments in Hubei and Xinjiang area presented with an obvious phenomenon wherein the system error became large given the weakening of the control strength. The abovementioned experiments demonstrate that the proposed method could effectively improve the accuracy of satellite stereo mapping. The application of the laser altimetry data was subject to the topographic relief. The laser altimetry data would become increasingly effective in a flat area but require a certain pre-process in mountainous areas before use. In practical applications, the laser data should be distributed evenly at no more than one track in the space interval.

mots-clés

ZY3-02 satellite;laser altimetry;geometry model refined;stereo images

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