Service National d'Observation: Imagerie Satellitaire des Déformations de la Terre


The main objective of the National Service of Observation ISDeform is to propose the monitoring of ground deformation due to different natural processes (e.g., external forcing, hydrology, geothermal), focusing in particular on telluric hazards: earthquakes, landslides, volcanic activity, using optical and radar satellite imagery. ISDeform aims to support observatories, the French scientific community and its partners in the South in the use of these satellite data. Its main mission is to provide databases/products (interferograms, time series, Digital Terrain Models) on targets of high scientific interest as well as systematic and on-demand processing services. The SNO is also developing interactions with the “continental surface” community (e.g., the SNOs Glacioclim and H+) in order to provide complementary observations or adapted services.

Location of the priority targets of the SNO ISDeform

Priority targets

ISDeform processes satellite data for priority targets associated with the telluric hazards: volcanoes, landslides and earthquakes. For volcanoes, we focus on the active volcanoes located in overseas French territory: Piton de la Fournaise, Soufrière of Guadeloupe, Montagne Pelée and Mayotte. These volcanoes are already monitored within the framework of SNOV. In addition, we study the Indonesian volcano, Merapi which is a VELI instrumented site. The volcano is considered as an analogue to the Antillean volcanoes. For landslides, the priority targets are the OMIV instrumented sites. For the tectonic application, the priority is given to regions in France associated with a high seismic hazard.

Dataset available

We collect satellite data from various radar (Sentinel-1, TerraSAR-X, ALOS, …) or optical (Sentinel-2, Pleiades) missions and we provide high value-added satellite products: displacement fields, velocity maps, time series and Digital Terrain Models (DEM). The service also provides standardised metadata to facilitate database searches and to ensure reproducibility of processing and interoperability at European level. Finally, ISDeform provides a large amount of auxiliary and intermediate data which allows for product qualification and research reuse. 

Collaborations et Partenaires

ISDeform is composed of 5 different OSU (Observatory of the Sciences of the Universe):

  • OSUG (Grenoble); contact: Marie-Pierre Doin (
  • EOST (Strasbourg); contact: Jean-Philippe Malet (
  • OSUL (Lyon); contact: Cécile Lasserre (
  • IPGP (Paris); contact: Raphaël Grandin (
  • OPGC (Clermont-Ferrand); contact: Valérie Cayol (

ISDeform work in strong collaboration with the national observatory SNOV et OMIV.