An ingenious vintage German cycle map (2014)

Re:An ingenious vintage German cycle map (2014) by lucb1e on Saturday July 28, 2018 @01:16PM (#17634015)

For those who prefer OpenStreetMap-based solutions, OsmAnd and OpenRouteService[1] do this as well, and GraphHopper (available on osm.org and on [2]) shows total ascend+descend. Not sure what they base the data on, though, as most roads aren't tagged with a very accurate inclination, so I guess it uses a height database that is not OSM-based.

[1] https://maps.openrouteservice.org

[2] https://graphhopper.com/maps/

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Re:An ingenious vintage German cycle map (2014) by mohn on Monday July 30, 2018 @08:02AM (#17643822)

Thanks for sharing those. The popup on hover says "Elevation: [...]" so I think you're right that they're approximating grade by using a height database. It could be OSM-based if enough contributors are supplying lists of (lat, lon, elev) GPS coordinates from journeys they take.

It's also very possible that they're using the public domain dataset from the Shuttle Radar Topography Mission (SRTM)[1] in 2000 -- probably with some cleaning to eliminate large spikes due to trees and buildings.

[1] https://wiki.openstreetmap.org/wiki/SRTM

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