ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume IV-3
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., IV-3, 239–244, 2018
https://doi.org/10.5194/isprs-annals-IV-3-239-2018
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., IV-3, 239–244, 2018
https://doi.org/10.5194/isprs-annals-IV-3-239-2018

  23 Apr 2018

23 Apr 2018

THE COORDINATE TRANSFORMATION METHOD OF HIGH RESOLUTION DEM DATA

Chaode Yan1, Wang Guo2, and Aimin Li1 Chaode Yan et al.
  • 1School of Water Conservancy and Environment, Zhengzhou University, Zhengzhou, China
  • 2College of Surveying and Geo-Informatics, Tongji University, Shanghai, China

Keywords: High Resolution DEM, Coordinate Transformation, Elevation, TIN

Abstract. Coordinate transformation methods of DEM data can be divided into two categories. One reconstruct based on original vector elevation data. The other transforms DEM data blocks by transforming parameters. But the former doesn’t work in the absence of original vector data, and the later may cause errors at joint places between adjoining blocks of high resolution DEM data. In view of this problem, a method dealing with high resolution DEM data coordinate transformation is proposed. The method transforms DEM data into discrete vector elevation points, and then adjusts positions of points by bi-linear interpolation respectively. Finally, a TIN is generated by transformed points, and the new DEM data in target coordinate system is reconstructed based on TIN. An algorithm which can find blocks and transform automatically is given in this paper. The method is tested in different terrains and proved to be feasible and valid.