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We combine ALOS-PALSAR coherence images with airborne LiDAR data, both acquired over the Piton de la Fournaise volcano (Reunion Island, France), to study the main errors affecting repeat-pass InSAR measurements and understand their causes. The high resolution DTM generated using LiDAR data is used to subtract out the topographic contribution from the interferogram and to improve the radar coherence maps. The relationship between LiDAR intensity and radar coherence is then analyzed over severaldoi:10.1109/igarss.2012.6350558 dblp:conf/igarss/SedzeHBBJ12 fatcat:tc2a66b2szearayk3zdwiyzgoa