1. School of Land Science and Technology, China University of Geosciences, Beijing 100083, China 2. China Aero Geophysical Survey and Remote Sensing Centre for Land and Resources, Beijing 100083, China
To improve the offset results influenced by large spatial baseline and topography when traditional offset tracking technique is applied to extracting mountain glaciers surface movement, the authors studied a DEM-assisted offset tracking technique. Two pairs of TerraSAR-X images with different baseline lengths which cover the eastern section of Chomo Lhari Mountains located in Kangmar and Nagarze County of Tibet were selected to test the traditional and external DEM-assisted offset tracking techniques in this paper. And the offset results of the two methods in ice-free region were comparatively studied. A pair of COSMO-SkyMed images acquired by different beam modes, with different incidences and covers, were selected and processed with DEM-assisted offset tracking technique. It is shown that the DEM-assisted offset tracking technique could obtain more reliable offset results than the traditional technique where the terrain is steep and the spatial baseline is large. The technique can also apply to SAR images which have different beam modes and can make more SAR data useful for glaciers surface movement monitoring.
基金资助:中国地质调查局地质调查项目“青藏冰川变化与冰湖溃决灾害遥感综合调查”(DD20160342);中欧“龙计划”四期项目“landslide identification, movement monitoring and risk assessment using advanced earth observation techniques”(32365)
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2018, Vol. 30 
), 周伟1, 袁蔚林2, 童立强2, 郭兆成2
