Multitemporal InSAR Coherence Change Analysis: Application to Volcanic Eruption Monitoring

Interferometric Synthetic Aperture Radar (InSAR) coherence time series provides potential information used for temporal change monitoring of regions of interest on the Earth surface. This paper addresses the change analysis of multitemporal InSAR coherence images for volcanic eruption monitoring using Change Detection Matrix (CDM) approach. The Piton de la Fournaise volcano (French island La Réunion) with four eruptions in 2018 was selected as a case study. From InSAR image time series (ITS) included 28 Sentinel-1 images acquired during 2018 over the study area, sorted by acquisition date, 27 coherence images were computed between each two adjacent dates. Changes on the ground related to volcanic eruptions were analyzed through the obtained coherence ITS using CDM framework. The preliminary results on lava extent mapping have demonstrated the relevancy of this study.