OpenSnowMap Contour Lines
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http://www.opensnowmap.org/opensnowmap-overlay/%1/%2/%3.png
Openstreetmap contributors | Rendering: www.opensnowmap.org | DEM: ASTER GDEM is a product of METI and NASA
SRTM V4.1 from CGIAR-CSI EU-DEM: Produced using Copernicus data and information funded by the European Union