OpenStreetMap
I found a nice little feature in JOSM: q makes rectangles with 90 degree angles. They look perfect while still in JOSM. Then it gets rendered and I end up with parallellograms. What's up with that? (and more importantly: what can I do to prevent it?)
Jo
Discussion
Comment from Vclaw on 24 September 2010 at 15:51
Check what projection you are using in JOSM - on Edit -> Preferences, then third icon down. It should be set to Mercator, then you'll get things the same shape as they are on the online maps.
Comment from Polyglot on 24 September 2010 at 19:13
Yep, that was the culprit. Many thanks for your help!!!
Jo