The focus of the module SD is on measurements in different climatic zones along elevation gradients to cover different snow amounts and site characteristics. As a result, the estimation of SWE from Cosmic-Ray Neutron Sensing (CRNS) data will be refined. Stationary and mobile CRNS measurements at alpine sites in Austria with steep environmental gradients will be complemented by a cascade of lower-lying sites in Germany. Laser scanning based snow observations and terrestrial photography will provide reference data on the spatial distribution of SWE and snow coverage. The obtained data will be used to set up neutron transport modeling to generalize the findings.