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In the framework of the SLAM (Service for Landslides Monitoring) project funded by the European Space Agency, the Permanent Scatterers (PS) processing and the analysis of high resolution images (e.g. SPOT5 and aerial-photos) have been performed at a basin scale, on the whole territory of the Arno River basin (Central Italy). About 350 SAR images have been interferometrically processed by means of the PS technique, detecting about 650,000 PS. The processing of SPOT5 images and aerial-photos, still in progress, have been performed for the extraction of features related to the landslide presence, useful for the geomorphological analysis and, as a consequence in order to give a spatial meaning to the punctual information provided by the PS. This procedure has been coupled with a intense geological interpretation phase characterized by the analysis of traditional in situ monitoring data, ancillary data and the performing of field surveys. The final results will impact on the current instruments used by the Arno Basin Authority for the landslide risk management (e.g. Hydrogeological Management Plan - Piano per l'Assetto Idrogeologico - PAI).