COST Action ES1404 EO GNSS H-SAF HarmoSnow LWC MODIS Research & information: general Rofental glaciers SAR SWE Sentinel-2 aerodynamic roughness length annual AAR cold regions data assimilation fractional snow cover hydropower application integration of remote sensing with models (hydrological land surface land surface model mass balance meteorological and climate) near-infrared reflectance northern Mongolia optical remote sensing persistent and intermittent snow remote sensing run-off modelling snow