Bulletin of Surveying and Mapping ›› 2019, Vol. 0 ›› Issue (11): 39-43.doi: 10.13474/j.cnki.11-2246.2019.0348

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Quality assessment and accuracy optimization of DSM using GLAS laser altimetry data

HU Liuru1,2,3, TANG Xinming1,2, LI Guoyuan2, FU Dongxia3, DOU Xianhui2, ZHAO Shihu2   

  1. 1. College of Geomatics, Shandong University of Science and Technology, Qingdao 266590, China;
    2. Land Satellite Remote Sensing Application Center, MNR, Beijing 100048, China;
    3. The First Topographic Surveying Brigade, MNR, Xi'an 710054, China
  • Received:2019-05-08 Revised:2019-06-26 Published:2019-12-02

Abstract: In this paper, a new method using satellite laser altimetry data directly is proposed to optimize and improve digital surface model (DSM) product accuracy. The experiment is implemented in central Asia, and DSM is produced by ZY-3 satellite. The elevation control points are selected from laser altimetry data based on multi-criteria constraint. Then DSM is corrected by the elevation control points using skewness, median, linear polynomial, quadratic polynomial model. The four models can effectively eliminate DSM systematic errors. In addition, the quadratic polynomial model is more applicable to flat and hilly land, and the linear polynomial is more applicable to alpine region. Preliminary test results show that the technical process of DSM accuracy optimization based on satellite laser altimetry data is feasible and the elevation accuracy of DSM is favorable after correction by the four models.

Key words: satellite laser altimetry, digital surface model, geodetic ground control, accuracy optimization, quality validation

CLC Number: