摘要
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.
Synthetic aperture radar interferometry (InSAR) has been used as aninnovative technique for digital elevation model (DEM) and topographic map generation. In thispaper, external DEMs are used for InSAR DEM generation to reduce the errors in data processing. TheDEMs generated from repeat-pass InSAR are compared. For steep slopes and severe changes intopography, phase unwrapping quality can be improved by subtracting the phase calculated from anexternal DEM. It is affirmative that the absolute height accuracy of the InSAR DEM is improved byusing external DEM. The data processing was undertaken without the use of ground control points andother manual operation.
基金
Funded by the Key Tenth five Project of State Bureau of Surveying and Mapping (No. 1469990324236 04 06) and the Faculty Research Grant of Uni versity of New South Wales (No. PS03283).
