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Monitoring land subsidence with InSAR

Parameters of satellite radar interferometry for deformation measurements
Interferometric images of Ancona, ItalyDeformation of a built-up area

P. Marinkovic (TU Delft, DEOS)

On the initiative of the Subcommission Land Subsidence and Sea Level Change of the NCG, the NCG is supporting the Ph.D. research project 'Monitoring land subsidence with InSAR' (Inertial Synthetic Aperture Radar). Besides by the NCG the project is financed by ALW-NWO, TU Delft and the Survey Department of Rijkswaterstaat. The research is focusing on the use of satellite radar interferometry for monitoring land subsidence in the Netherlands. Herewith long time series of radar images are being used, recorded from 1992 by the satellites ERS1, ERS2 en ENVISAT. Because most of the radar images are useless because of temporal changes in the terrain, this research is viewing on special point reflections that produce useful measurements during a long time. It is proved that in urban and built-up areas a density of 150 points per km2 can be obtained.

The research started in 2003 and is carried out by P. Marinkovic. His supervisor is Dr.Ir. R.F. Hanssen (TU Delft, DEOS). As a special point of attention Mr. Marinkovic is looking at the optimum combination of radar data from satellite orbits (ascending, descending, nearby) en various sensors like ERS, ENVISAT, ALOS (L-band) and ENVISAT ScanSAR. The main question that has to be answered is in using all possible radar data of a certain area how an optimum deformation analysis can be carried out and which methods and algorithms have to be developed for this purpose.