Abstract
The external digital elevation model (DEM) error is one of the main factors that affect the accuracy of mine subsidence monitored by two-pass differential interferometric synthetic aperture radar (DInSAR), which has been widely used in monitoring mining-induced subsidence. The theoretical relationship between external DEM error and monitored deformation error is derived based on the principles of interferometric synthetic aperture radar (DInSAR) and two-pass DInSAR. Taking the Dongtan and Yangcun mine areas of Jining as test areas, the difference and accuracy of 1:50000, ASTER GDEM V2, and SRTM DEMs are compared and analyzed. Two interferometric pairs of Advanced Land Observing Satellite Phased Array L-band SAR covering the test areas are processed using two-pass DInSAR with three external DEMs to compare and analyze the effect of three external DEMs on monitored mine subsidence in high- and low-coherence subsidence regions. Moreover, the reliability and accuracy of the three DInSAR-monitored results are compared and verified with leveling-measured subsidence values. Results show that the effect of external DEM on mine subsidence monitored by two-pass DInSAR is not only related to radar look angle, perpendicular baseline, slant range, and external DEM error, but also to the ground resolution of DEM, the magnitude of subsidence, and the coherence of test areas.
Highlights
The exploitation of underground mineral resources brings great material wealth and damages the natural environment at the same time
To analyze the effect of external digital elevation model (DEM) on mine subsidence monitored by two-pass Differential interferometric synthetic aperture radar (DInSAR), two interferometric pairs of ALOS Phased Array L-band SAR (PALSAR) single look complex (SLC) images and three external DEMs with different resolutions are collected
The DEM is publicly released by the Japanese Ministry of Economy, Trade, and Industry and the American National Aeronautics and Space Administration (NASA), and is the only elevation images data set with high resolution covering the global land surface
Summary
The exploitation of underground mineral resources brings great material wealth and damages the natural environment at the same time. For two-pass DInSAR, it is necessary to simulate topographic phase by an external digital elevation model (DEM) and remove it from SAR interferometric phase to extract land subsidence phases and values. The Advanced Land Observing Satellite Phased Array L-band SAR (ALOS PALSAR) interferometric pairs covering the Dongtan and Yangcun mine areas are processed using two-pass DInSAR with three external DEMs. Some key images in the processing are given, including original and enhanced differential interferograms, coherence images, unwrapped phase images, and subsidence images. Some key images in the processing are given, including original and enhanced differential interferograms, coherence images, unwrapped phase images, and subsidence images All of these aim to compare and analyze the effect of three external DEMs in high- and low-coherence regions with different subsidence magnitude. In lowcoherence regions with slight subsidence, the subsidence values obtained by three external DEMs vary greatly and are clearly different from the leveling-measured subsidence values
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