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

[Andre Joost]

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.

Greetings,
André Joost