[Proj] Beginner Question: Latitude/Longitude to x, y conversion - understanding output

Andre Joost andre+joost at nurfuerspam.de
Mon Feb 24 13:27:31 EST 2014

Am 24.02.2014 15:37, schrieb Antti Castrén:

> You simply can NOT project the poles (lat=90) using Mercator
> projection, because the formulae give the infinity as result. Stop at
> around 75N/S degrees in case you want something usable.

If you stop at 85°N/S, the map will be a square. That`s the logic behind 
using 256x256pixel tiles as Google and Openstreetmap do.

André Joost

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