RS navigation buttons

Removal of Residual Errors From SAR-Derived Digital Elevation Models For Improved Topographic Mapping of Low-Relief Areas

K. Clint Slatton (1), Melba M. Crawford (1),
James C. Gibeaut (2), and Roberto Gutierrez (2)

(1): Center for Space Research, University of Texas at Austin
(2): Bureau of Economic Geology, University of Texas at Austin

This work was supported by the Texas Regional Change Program through the Texas Space Grant Consortium and the Johnson Space Center, a National Aeronautics and Space Administration grant under the Topography and Surface Change Program (Grant NAG5-2954), and the Texas Advanced Technology Program.


Interferometric synthetic aperture radar data can be used to precisely map topography, but low-relief areas are problematic because errors in the data can be large compared to the topographic variations. The NASA/JPL TOPSAR system acquired data over a low-relief test site on the Texas coast in 1996. Due to unusually high turbulence during the acquisition and the mild topography, residual height errors were visible in the Digital Elevation Model (DEM). The characteristics of the error signal are described and a method is outlined for removing the residual error and mosaicking the affected TOPSAR frames.


Last Modified: Tue July 13, 1999