Theia Glaciers Scientific Expertise Centre (SEC) gathers together teams IGE-Grenoble and LEGOS-Toulouse who are developing products related to glaciers and their evolution using optical spatial remote sensing.
The users are R&D (input glaciological data for the study of the climate/glacier relationship and for glacio-hydrological modelling), industry (hydropower producers) and local authorities including National Parks (monitoring glacier evolution).
The data used come from Sentinel-2, Landsat 5/8, ASTER and Spot-6/7.
The product Rate of Glaciers Elevation Changes(that also includes changes on the neighbouring non-glacierized terrain), developed by the LEGOS team, covers the 220,000 glaciers distributed in the different glacierized regions on Earth. Elevation changes are provided at a horizontal resolution of 100 m x 100 m, and annual rates are given for every 5-year periods: 2000-2004, 2005-2009, 2010-2014 & 2015-2019, 10-year periods: 2000-2009 & 2010-2019, and over the entire 20-year period: 2000-2019.
2018: finalization of the automated data processing chain and validation of the product “altitude of the annual glacier equilibrium line” for the glaciers of the French Alps for the period 2000-2016
2019: validation of the product on the scale of the European Alps for the period 2000-2016
Spring – summer 2020: Availability of the product “Glacier annual equilibrium-line altitude” for 239 glaciers in the European Alps for the period 2000-2016
Spring – summer 2021: Availability of the product “Glacier surface elevation changes » for the period 2000-2019 and every 5-yr and 10-yr sub-periods.