Landslide Mapping Using InSAR and GIS Techniques: A Case Study at Debresina Area, Ethiopia

Abstract A landslide is the major geohazard in the Ethiopian highlands. We used InSAR and GIS techniques to map landslide susceptibility. SAR images generated from Sentinel 1A are utilised for landslide displacement investigations during the InSAR method. GIS analysis results showed that it is a powerful technique to classify landslide zoning into very high, high, moderate, and low susceptibility, whereas the wrapped Interferogram shows a displacement of -12 to 12 mm/yr. Thus, high and very high classes of landslide zoning overlapped in the highest displacement regions. Results were validated with GPS data using the R-index method. Accordingly, 79.45% of sample points fall on the displacement map (Interferogram), and the same percent of those points overlap with the high and very high landslide zones. This means InSAR and GIS methods can be used for landslide susceptibility mapping, but for more accuracy and quantification of landslide displacement, InSAR techniques are recommended.