Application Robust Filter in Post Process of InSAR Monitoring Results

Due to errors existing in InSAR monitoring results, the filter is adopted for post processing to improve the monitoring results precision. Considering the existent insufficiency of weighted filter and median filter, we proposed a new idea of robust filter by using an equivalent weight, which not only think of regional statistical characteristic fully but also can resist the influence of outliers. Finally, the method is evaluated by a case study of InSAR monitoring results at one region of Xi´an in 2007. The result shows that contour has been improved obviously after treated with filter and the method of robust filter make the effect more obvious.