Landslide, a disturbance in the slope stability causing alteration in the slope profile can be triggered by nature or anthropogenic activities. It is important to monitor the landslide spots so that the devastating effects in resources, human life and economy can be minimized. This paper analyses landslide disasters in Devikulam taluk of Idukki district, Kerala with SAR (Synthetic Aperture Radar) Interferometry technique considering the torrential rainfall of 2018 (June - August) using Sentinel-1 C band (5.36 GHz) SAR data. Fourteen ground truth landslide locations coincided with interferogram observations. On the CartoDEM derived slope, 22 slides were observed to be located in steep slope, 5 slides in moderate slope and Polinjapalam slide was located in rolling terrain. The overall accuracy of the study in preliminary detection of landslides through the interferogram was computed to be 48.72 %. The vertical displacement was quantified in the range -0.755 m to -0.008 m proving the technique is effective.

中文翻译：

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使用SAR干涉法对印度喀拉拉邦Idukki区的选定区域进行滑坡调查

滑坡是自然界或人为活动触发的，引起边坡稳定性发生变化的边坡稳定性扰动。监视滑坡点很重要，这样可以最大程度地减少对资源，人类生活和经济的破坏性影响。本文使用Sentinel-1 C波段（5.36 GHz）SAR数据，结合SAR（合成孔径雷达）干涉技术，分析了喀拉拉邦Idukki地区Devikulam taluk的滑坡灾害，并考虑了2018年（6月至8月）的暴雨。十四个地面真相滑坡的位置与干涉图观测结果一致。在CartoDEM派生的斜坡上，观察到22个滑坡位于陡坡上，5个滑坡处于中坡，而Polinjapalam滑坡位于起伏地形中。通过干涉图初步检测到的滑坡研究的总体准确性为48.72％。垂直位移量化在-0.755 m至-0.008 m范围内，证明该技术有效。