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Inter-comparison of persistent scatterer interferometry results

Michele Crosetto(1), Marta Agudo(1), Monica Sawicka(1) and Barbara Pucci(1)

(1) Institute of Geomatics, Avinguda del Canal OlĂ­mpic, s/n, 08860, Castelldefels (Barcelona), Spain


The paper will be focused on the analysis of the PSI (Persistent Scatterer Interferometry) results generated in two major ESA projects: PSIC4 and Terrafirma. The paper will be only focused on the inter-comparison of the PSI results generated by different teams using different PSI approaches. It is important to underline that the results considered in this paper should not be confused with those coming from validation experiments, where the PSI products are compared against ground truths. The paper will describe the results of the Provence inter-comparison, which are based on the PS datasets generated in the PSIC4 project, and the results of the PSI Validation Project, an ongoing validation exercise run within the Terrafirma project.

The results of the Provence inter-comparison come from the PSIC4 test site, which is located around a mining area located in Provence (southern France). The inter-comparison concerns four of the height PSI teams involved in the PSIC4 project, which are among the five Operational Service Providers of the Terrafirma project: Altamira Information, DLR, Gamma Remote Sensing and TRE. The Provence inter-comparison has specific characteristics which make it different from the analysis performed in PSIC4. Firstly, it is only based on the original PSI data, defined in the radar image space, while PSIC4 concerned both geocoded PSI products and data in the original radar coordinates. Then, it concerns a remarkably larger area with respect to PSIC4, 925 vs. 100 km2. It is only focused on inter-comparison, while PSIC4 involved both validation and inter-comparison activities. Furthermore, it concerns only deformation velocities and deformation time series, while in the PSIC4 project other aspects of the PSI products were analysed. Finally, the Provence inter-comparison is restricted to four of the five Operational Service Providers of Terrafirma, while PSIC4 involved the analysis of the results of eight PSI teams.

The second type of results comes from the PSI Validation Project of Terrafirma. In this project are analysed the PSI results of four teams: Altamira Information, Gamma Remote Sensing, NPA and TRE. An additional PSI dataset, processed by the Technical University of Delft is available for further comparison. The results cover two test areas located in Holland, Amsterdam and Alkmaar, and were generated using ERS and ASAR data.

The paper will be mainly focused on the following three types of PSI products: - deformation velocity maps, - deformation time series, - topographic errors.


Workshop presentation

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry