1 Combined use of space-borne SAR interferometric techniques and ground-based 1 measurements on a 0.3 km 2 subsidence phenomenon 2 D. Raucoules a *, C. Cartannaz b , F. Mathieu a , D. Midot b 3 a BRGM, 3 avenue Guillemin, 45060, Orléans, France 4 b BGRM Lorraine, 1 avenue du parc de Brabois, 54 500, Vandœuvre-lès-Nancy. 5 *corresponding author: d.raucoules@brgm.fr 6 Highlights: 7 - DInSAR is applied to a subsidence phenomenon covering a small area (0.3 km²). 8 - A combination of conventional DInSAR using L-Band data and PSI technique is proposed. 9 - The results were used for adapting a ground-based network to the deformation characteristics. 10 11 Abstract: 12 The built-up area of the village Hilsprich (Lorraine, France) is affected by a subsidence phenomenon localized 13 over a few hundred square metres, causing damage to buildings. In this study, differential SAR interferometry 14 (DInSAR) was used to: 15  estimate the boundaries of the subsidence in order to optimize ground-based monitoring networks 16 (levelling and geophysical measurements) 17  estimate the maximum deformation and highlight the evolution of the phenomenon (previously 18 unknown due to insufficient historical ground-based data). 19 The study was based both on L-band ALOS/PALSAR SAR data and C-band Envisat/ASAR data. The interest in 20 PALSAR data lies in its better performance for InSAR with respect to C-band data on the affected non-urban 21 areas (such as fields and farmlands) where, in addition, conventional techniques such as topographical survey 22 information was limited, and had often not been carried out before the first damage was observed. 23 Conventional DInSAR based on PALSAR data processing for the 2008–2010 period identified the boundary of 24 the subsidence area and estimated its maximum magnitude. The PSI technique in the ASAR archive gave 25 information regarding the beginning of the subsidence. The precision of the DInSAR results was consistent with 26 *Manuscript Click here to download Manuscript: 35459_35459_hilsprich_2013_06_29_finale2_track_changes.docx