A case study of using external DEM in InSAR DEM generation |
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| Authors: | Zhou Chunxia Ge Linlin E Dongchen Chang Hsingchung |
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| Institution: | (1) Chinese Antarctic Center of Surveying and Mapping, Wuhan University, 129 Luoyu Road, 430079 Wuhan, China;(2) Visiting Research Association, School of Surveying and Spatial Information System, The University of New South Wales, 2052 Sydney, NSW, Australia |
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| Abstract: | Synthetic aperture radar interferometry (InSAR) has been used as an innovative technique for digital elevation model (DEM) and topographic map generation. In this paper, external DEMs are used for InSAR DEM generation to reduce the errors in data processing. The DEMs generated from repeat-pass InSAR are compared. For steep slopes and severe changes in topography, phase unwrapping quality can be improved by subtracting the phase calculated from an external DEM. It is affirmative that the absolute height accuracy of the InSAR DEM is improved by using external DEM. The data processing was undertaken without the use of ground control points and other manual operation. |
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| Keywords: | InSAR digital elevation model (DEM) external DEM |
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