High Resolution Sar Imagery for Surface Deformation Assessment
نویسندگان
چکیده
The geodetic information of the terrain can be measured using remote sensing techniques such as photogrammetry, airborne laser scanner (ALS) and interferometric synthetic aperture radar (InSAR). They are considered to be more cost-effective and complementary to conventional ground-based surveying methods. Differential InSAR (DInSAR) can be further used to monitor the dynamic change of the terrain by eliminating the topography from the interferometric phase. The aim of this study is to examine the importance of the resolution of the digital elevation models (DEMs) and the SAR images towards subsidence mapping. The multisensor data which have the various wavelengths, repeat-cycles and imaging resolutions are tested in the following sections. Two DEMs, including a SRTM 90m resolution DEM, and the SAR data acquired by ERS-1/2, JERS-1, Radarsat-1 and ENVISAT were tested and compared. The results indicated the SRTM works well to remove the topographic phase fringes for the moderate terrain. But some topographic residue phases would still occur at steep terrain or in the results of the pairs with larger perpendicular baseline. The results also showed that the coherence of the Radarsat-1 data at finer resolution is conserved better than the ERS-1/2 interferometric pairs. The scheduled SAR satellites in the coming years are also discussed in this paper.
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تاریخ انتشار 2006