World Mapping Issues

There are various issues in doing world scale mapping with MapServer. Some related to crossing the anti-meridian (the dateline), and some related to conversion between lat/long and polar projections near the pole, and some related to attempts to map off the bounds of validity of some projections (ie. over the horizon). This topic is intended to act as a location to discuss some of the issues, include hints, and collect a set of use-cases that break but that we want to make work.

An older version of this discussion from around 2005 may also be of some interest, though in some respects the situation has changed.