Monitoring Three Dimensional Displacements of the Shuping Landslide, Three Gorges Area with Multi- Temporal Terrasar-X Sar Images

摘要

Three dimensional displacements are more convenient for people understanding ground processes. However, only azimuth or line of sight (LOS) measurements can be directly extracted from SAR images which restrict further applications, especially for people who are not expertise in radar remote sensing. Aiming at this problem, we proposed an approach of retrieving time series three-dimensional displacements from multi-angular SAR datasets. Firstly, time series displacements in the azimuth and LOS direction can be estimated using traditional methods of SAR interferometry (InSAR) and SAR pixel offset tracking. Then, a fitting and interpolation procedure was applied to parameterize the displacement history and interpolate the displacements from different datasets with identical dates. Thus, three dimensional displacements can be obtained by making use of the different observation geometry of different SAR datasets. Our method was applied to retrieve three dimensional displacements history of the Shuping landslide, Three Gorges area, China.