标题：Effect of external digital elevation model on monitoring of mine subsidence by two-pass differential interferometric synthetic aperture radar
作者：Tao, Qiuxiang; Gao, Tengfei; Liu, Guolin; Wang, Zhiwei
作者机构：[Tao, Qiuxiang; Gao, Tengfei; Liu, Guolin; Wang, Zhiwei] Shandong Univ Sci & Technol, Geomat Coll, Qingdao, Peoples R China.
通讯作者地址：[Liu, GL]Shandong Univ Sci & Technol, Geomat Coll, Qingdao, Peoples R China.
来源：JOURNAL OF APPLIED REMOTE SENSING
关键词：external digital elevation model; differential interferometric synthetic; aperture radar; mine subsidence
摘要：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 highand 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. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License.