SAR data may be a valuable source of information about the threat of landslides on a large areas.
Landslides studies based on SAR data may present different approaches. First of all, SAR images may be used to create Digital Elevation Models (DEM). DEMs are then utilized in the assessment of the risk of landslides occurrence. They may be used in the identification of steeply sloping areas which are the most threatened by landslides.
By applying the DInSAR technique it is possible to monitor the velocity of vertical ground deformations in the studied landslide area. It is however necessary that the landslide have at least 200x200 m size. Otherwise, the SAR system cannot detect it. There should be also buildings, roads or other infrastructure elements located in the landslide area which scatter the radar wave strongly and coherently.
The best results in landslides monitoring can be obtained by applying the PSInSAR technique. In this approach it is also important to have appropriate objects (e.g. buildings, roads, etc.) located in the landslide area. The presence of man-made structures allows the PSInSAR technique to identify many stable points in which even very small vertical deformations may be monitored precisely.
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