Geometrically corrected products are of a higher processing level than radiometrically corrected products. For Sentinel-2, the geometrically corrected product is the Level-1C product. The Level-1C product results from using a Digital Elevation Model (DEM) to project the image in cartographic coordinates. Per-pixel radiometric measurements are provided in Top Of Atmosphere (TOA) reflectances with all parameters to transform them into radiances. Level-1C products are resampled with a constant Ground Sampling Distance (GSD) of 10, 20 and 60 m depending on the native resolution of the different spectral bands. Level-1C products will additionally include Land/Water, Cloud Masks and ECMWF data (total column of ozone, total column of water vapour and mean sea level pressure). (Sentinel-2 User Handbook, p.44)