Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography (한국측량학회지)

Korean Society of Surveying, Geodesy, Photogrammetry and Cartography (한국측량학회)
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Accuracy Improvement of KOMPSAT-3 DEM Using Previous DEMs without Ground Control Points

  • Lee, Hyoseong (Dept. of Civil Engineering, Sunchon National University) ;
  • Park, Byung-Wook (Dept. of Civil, Safety, and Environmental Engineering, Hankyong National University) ;
  • Ahn, Kiweon (Dept. of Civil Engineering, Gyeongsang National University)
  • Received : 2017.07.13
  • Accepted : 2017.08.28
  • Published : 2017.08.31
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Abstract

GCPs (Ground Control Points) are needed to correct the DEM (Digital Elevation Model) produced from high-resolution satellite images and the RPC (Rational Polynomial Coefficient). It is difficult to acquire the GCPs through field surveys such as GPS surveys and to read the image coordinates corresponding to the GCPs. In addition, GCPs cannot cover the entire image of the test site, and the RPC correction results may be influenced by the arrangement and distribution of the GCPs in the image. Therefore, a new method for the RPC correction is needed. In this study, an LHD (Least-squares Height Difference) DEM matching method was applied using previous DEMs: SRTM DEM, digital map DEM, and corrected IKONOS DEM. This was carried out to correct the DEM produced from KOMPSAT-3 satellite images and the provided RPC without GCPs. The IKONOS DEM had the highest accuracy, and the height accuracy was about ${\pm}3m$ RMSE in a mountainous area and about ${\pm}2m$ RMSE in an area with only low heights.

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References

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