The distance from each ski area extracted from OpenStreetMap and the closest ski area known in the Skimap.org project tells us if a ski area is likely missing from .Skimap.org. The criterium here is 5km.

The reverse analysis can be found here: Pistes missing from OpenStreetMap.org.

Legend

  OSM ski area farther than 5km from a Skimap.org ski area
  OSM ski area closer than 5km from a Skimap.org ski area
  Skimap.org ski area
  Opensnowmap.org downhill ski pistes at low zoom
  Opensnowmap.org crosscountry ski pistes at low zoom

Learn more

There is very little doubt that OpenStreetMaps has a complete set of ski pistes neither Skimaps.org has maps for any ski resort in the world. However, by comparing both projects we can have a coarse idea of their completness. At least, I hope these results will increase the will to participate to both projects.


Last run

  • Last run on: xx
  • Skimap.org has xx ski areas
  • Openstreetmap has xx downhill ski areas
  • Openstreetmap has xx nordic ski areas
  • xx skimap.org areas are close to OSM downhill areas  
  • xx skimap.org areas are close to OSM nordic areas  

What are OpenStreetMap ski areas ?

For this analysis, OSM pistes of the same type (downhill or crosscountry skiing) are buffered and glued together so that a ski area looks like a polygon. This is a coarse approximation of a ski area in OSM, as the mapping of ski resorts per se is scarce compared to the number of pistes mapped.
Also, large networks of pistes (notably for nordic skiing) are split arbitrarily in regular areas ranging from 20km to 40km.

no distinction is made wether a ski area is tagged nordic or downhill at skimap.org's, only for OSM data.


How is it done exactly ?

Have a look on the github repository, the analysis is done in the .sql files.
Thanks a lot to Russel to make Skimap.org data available trough an API.