Abstract

Differential SAR interferometry (DInSAR) techniques are extensively utilized over decades to monitor and detect surface distortion. Interferometric SAR results obtained from Sentinel 1 data experience phase delay due to interference with the atmospheric water vapour and pressure and DEM is considered as one of the important parameter in topographic phase removal. In the present study, an attempt was made to eradicate the atmospheric errors and to assess the variation of LOS displacement with respect to different DEM. Results concluded GACOS based atmospheric correction eradicate the atmospheric error and help in improving the quality of LOS displacement. Comparison of InSAR results by utilizing SRTM, ALOS and Cartosat DEM and GACOS concluded that LOS displacement varies based on the accuracy of DEM and its resolution with the minimum error identified by utilizing CartoDEM over Kodagu region.

摘要

几十年来，差分 SAR 干涉测量 (DInSAR) 技术被广泛用于监测和检测表面失真。Sentinel 1数据获得的干涉SAR结果由于大气水汽和压力的干扰而出现相位延迟，DEM被认为是地形相位去除的重要参数之一。在本研究中，试图消除大气误差并评估 LOS 位移相对于不同 DEM 的变化。结果表明，基于 GACOS 的大气校正消除了大气误差，有助于提高 LOS 位移质量。利用 SRTM 比较 InSAR 结果，