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In the frame of the Copernicus program of the European Commission, Sentinel-2 is a constellation of 2 satellites with a revisit time\udof 5 days in order to have temporal images stacks and a global coverage over terrestrial surfaces. Satellite 2A was launched in June\ud2015, and satellite 2B will be launched in March 2017.  \udIn cooperation with the European Space Agency (ESA), the French space agency (CNES) is in charge of the image quality of the\udproject, and so ensures the CAL/VAL commissioning phase during the months following the launch. This cooperation is also\udextended to routine phase as CNES supports European Space Research Institute (ESRIN) and the Sentinel-2 Mission performance\udCentre (MPC) for validation in geometric and radiometric image quality aspects, and in Sentinel-2 GRI geolocation performance\udassessment whose results will be presented in this paper. The GRI is a set of S2A images at 10m resolution covering the whole world\udwith a good and consistent geolocation. This ground reference enables accurate multi-temporal registration of refined Sentinel-2\udproducts.  \udWhile not primarily intended for the generation of DSM, Sentinel-2 swaths overlap between orbits would also allow for the\udgeneration of a complete DSM of land and ices over 60° of northern latitudes (expected accuracy: few S2 pixels in altimetry). This\udDSM would benefit from the very frequent revisit times of Sentinel-2, to monitor ice or snow level in area of frequent changes, or to\udincrease measurement accuracy in areas of little changes

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

SENTINEL-2 GLOBAL REFERENCE IMAGE VALIDATION AND APPLICATION TO MULTITEMPORAL PERFORMANCES AND HIGH LATITUDE DIGITAL SURFACE MODEL