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OASYS Report Summary

Project ID: EVG1-CT-2002-00061
Funded under: FP5-EESD
Country: Germany

Interferometric SAR processing for the detection of landslides

The use of differential Synthetic Aperture Radar Interferometry (dInSAR) for the detection and monitoring of earth surface processes is meanwhile an established method. However, this approach has only success if the observed area fulfils specific requests, like sufficient backscattering, flat slope gradients or very slow growth of vegetation. In this European Union funded project OASYS -integrated optimisation of landslide alert systems plays the early identification of endangered areas the main important role. For the recognition of surface movements we have decided to investigate the capability of dInSAR.

The approach consists of several levels of SAR data processing. In the beginning of the processing levels we use the recorded data of the European Remote Sensing (ERS) satellites, flown in the ERS1/2 tandem mission for the determination of a Digital Elevation Model (DEM) of the area of investigation. This DEM serves on the one hand as a necessary processing level for the further SAR processing and on the other hand as an important data source for the GIS in the alert system, e.g. for the derivation of slope parameters. The further processing levels are based on the 3-pass interferometry approach using one or more additional ERS 1 and 2 radar scenes in relation to the ERS1/2-tandem data set for the final interferogram calculation.

Within the framework of this project five test sites in China, Greece, Germany, Hungary and Rumania were investigated and their results concerning the detection of landslides and possible earth surface movements were presented.

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