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 2km.
The reverse analysis can be found here: Pistes missing from OpenStreetMap.org.
Legend
• OSM ski area farther than 2km from a Skimap.org ski area• OSM ski area closer than 2km 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
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.Learn more
Last run
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.
Important notes for OpenStreetMap contributors :
- Although of little interest for OSM, it is worth noting that ski areas coordinates at skimaps.org are crowdsourced by Skimaps.org contributors from unknown sources. They are not to be used for contributing to OSM, except maybe to find areas where you’d like to survey.
- The maps reproduced at Skimap.org are usually copyrighted by third parties. They are not to be used for contributing to OSM without proper licencing or permission from the original data holder.