I created an own map for my p&p rpg group and now I want to transfer it into QGis. That's easy to make, but I'd like to have an own CRS for that map but don't know how to use the right proj.4 definitions. Maybe anyone here can help me with that? The map will be 30.000km from West to East and 21.000km from north to South.
David
Answer
Why do you need a CRS? If you don't set one in Qgis then Qgis will just assume your coordinates are on a plane. You won't be able to do things like convert them to lat-long, but then your world isn't on our world!
Is that 30-thousand km or 30-decimal-zero km?
If 30 km, then you could just keep your coordinates in metres and use British Ordnance Survey Grid references, and then your world would be a little square off the south-west coast of England if you tried to project it to a real map. But you don't need to give it a CRS unless you want to work with other data with other CRS systems, which I don't think you do.
Or... is this an entire planet, and you want it to be spherical, and you want to calculate distances between thing along great circles? Then you'd need to define a CRS with a different radius (or elliptical radius and eccentricity).
But otherwise, don't bother.
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