Acta Geodaetica et Cartographica Sinica ›› 2018, Vol. 47 ›› Issue (3): 359-369.doi: 10.11947/j.AGCS.2018.20170425

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ICESat Laser Points Assisted Block Adjustment for Mapping Satellite-1 Stereo Imagery

WANG Jin1, ZHANG Yong1,2, ZHANG Zuxun1, LI Xiao3, TAO Pengjie1,4, SONG Mengxiao1   

  1. 1. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China;
    2. Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China;
    3. TH Satellite Center of China, Beijing 102102, China;
    4. School of Resource and Environmental Science, Wuhan University, Wuhan 430079, China
  • Received:2017-07-21 Revised:2017-12-25 Online:2018-03-20 Published:2018-03-29
  • Supported by:
    The National Key Research and Development Program of China (No. 2017YFB0503004)

Abstract: Block adjustment without ground control points (GCPs) is an important technique for satellite images surveying and mapping without GCPs. It has great significance for mapping the areas which are in overseas and difficult to get GCPs. However, the positional accuracy of block adjustment without GCPs is generally hard to meet the requirements of the corresponding scale mapping specification. Making use of readily available, public geographic data as the reference, is an effective way to improve the accuracy of block adjustment without GCPs. ICESat/GLAS data is one of the good vertical control data. To improve the positional accuracy of mapping Satellite-1 imagery without GCPs, an ICESat laser points assisted block adjustment method for stereo satellite images is proposed in this study. First, high quality ICESat laser points are extracted automatically based on multi-criteria constraints. Then, free net adjustment is performed by using tie points obtained from automatic matching to realize the internal consistency in block areas. Finally, the ICESat laser points are used as control points after measured on the satellite images automatically, the horizontal coordinates of ICESat control points are calculated by intersection based on free net adjustment results, while the vertical coordinates of ICESat control points are got from the elevations of ICESat laser points themselves, then the orientation parameters are refined again based on free net adjustment to improve the vertical accuracy of satellite images. Experiments on the Mapping Satellite-1 images of Shandong province proved the effectiveness and feasibility of the presented method.

Key words: block adjustment without ground control points, ICESat, RPC, Mapping Satellite-1

CLC Number: