2012/2/20 Martin Koppenhoefer <[email protected]> > On the German ML we are currently discussing how to applicate "ele" to > towers (and similar situations). There is consensus that the key > "height" is describing the height of the structure from the ground to > the top. There is also consensus to tag elevation data in WGS84 (so > that numbers in local systems would typically have to be converted > before you can enter them). > > There are 2 alternatives: > > a) ele is the elevation of the ground around/below the tower (in the > case of a mountain summit it would be the elevation of the mountain, > not the tower). > > +1 I believe "ele=*" should be applied only to the terrain, and height would be the physical distance between the point at "ele=*" elevation and the one at "ele+height" elevation.
b) ele is the elevation of the highest point at the tagged spot, i.e. > the top of the tower > > -1 > Comments welcome. The idea is to clarify this aspect on the wiki page > for the key "ele". > For istance if there would ever be a DEM compatible with OSM licenses, I think it would be imported in ele=* tags. > > cheers, > Martin > > cheers, Stefano. > _______________________________________________ > Tagging mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/tagging >
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