Madrid as Seen from Sentinel-1: Preliminary Results☆

Abstract This work presents an overview of Madrid from Sentinel-1A SAR sensor. For this purpose, a preliminary analysis was carried out involving 35 Interferometric Wide Swath SLC images from 29/10/2014 until 15/05/2016. SARPROZ software based on PSInSAR methodology was used. Results include geographic location of each PS, absolute and relative height (m), line-of-sight (LOS) velocity (mm/year), cumulative displacement (mm), standard deviation (mm), temporal coherence and displacement time series (mm) with respect to the acquisition date and linear model assumption. A spatial analysis was performed in order to evaluate PS density and quality over different Corine land use classes. Validation analyses were conducted using available permanent GNSS stations in the studied area. Visual insights into the deformation map allowed for the identification of clusters of PSs with similar subsiding or uplifting tendency. These cases were analyzed and connected to urban changes in the studied period. Results show that SARPROZ-processed Sentinel-1A images can provide a high number of reliable PS points in large cities as Madrid, allowing an almost continuous monitoring of ground and structures in this complex urban landscape.