Technical information for snowhow maps

At snowhow we use different data sources for our maps:

  • Openstreetmap data for our basemap
  • digital elevation models (dem) for slope (and hillshade) calculations

DEM data sources

Data sources for our digital elevation model are listed on the page DEM datasources.

DEM processing

In a first step these datasets are reprojected and merged together. Afterwards slope and hillshade is calculated. For all calculations gdal open source software tools are used. The resulting slope-layer has a pixel resolution of 14.73x14.73m and is projected in Google Maps Global Mercator (EPSG:3785).