[OSM-talk] New "Highways" view in OSM Inspector
John Smith
deltafoxtrot256 at gmail.com
Sat Jan 9 01:31:14 GMT 2010
2010/1/9 Dave F. <davefox at madasafish.com>:
> I'm aware of the concept that the earth is not flat.
No but map projections are...
> But... This is a two dimensional map. IFAIK there is no 3d data. The PoV
> of viewing the OSM data via the likes of Mapnik is always through the
> surface of the earth to the centre of the earth. Therefore a line such
> as this Oz highway is, when viewed in a map, going to be straight.
Not when you plot it on a map tile, mercator projections turn the
earth flat, and when you make a curved surface flat, straight lines
become curved.
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