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Detecting landslides with PSInSAR method [Elektronski vir]
Jemec Auflič, Mateja ; Komac, Marko
Nowadays various techniques of satellite scanning represent a very good sourceof information. Very useful among others is a modern satellite radar interferometry method of Permanent scatters ...(PSInSAR) which enables very accurate component surface deformation velocity monitoring in the line-of-sight. This paper discusses the use of multiple image sets of SAR dataacquired by past and current satellite platforms in monitoring landslides.In total, 67 ERS scenes acquired between 1992 and 2000 by the ESA sensors along descending orbits were used for the interferometric and statistical analyses of the Škofja Loka and Cerkljansko area. About 2787 PS were identified, which correspond to outcrops and man-made structures such as building, poles, antennas etc. Two types of PS analyses were performed: Standard Permanent Scatterers Analysis (SPSA) and Advanced Analysis (APSA). The SPSA is suitable for mapping the territory at a regional scale, in order to identify unstable areas that deserve further detailed studies. The APSA is suitable for small areas where a full exploitation of the information content of the satellite data is required. With APSA it is possible to search for nonlinear motions and for PS with variable characteristics in time, significantly increasing the PS density. PS are detected and their average velocity is then estimated by an automatic procedure, allowing to process large amounts of data relative to large areas in a limited period of time. Based on the terrain properties, displacement of permanent scatterers in line of sight were calculated basic statistical properties. Proposed method enable detecting areas with slow ground motion and group of PS points with the similar appearance could be good indicator for landslides.
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