Thanks Richard and Nathan for the pointers - really appreciated. I think I've got it now.
Nathan Vander Wilt wrote: > [...] > That said, I'm guessing there are other assumptions being made > within OSM that break down under spherical geometry. If your polygon > doesn't contain pole(s) or cross the +/-180 degree meridian, > checking the winding could be handled by a cartesian algorithm. Yep - it's so that Potlatch can show the direction of a closed way; happily Potlatch works with projected co-ordinates anyway and is (happily) unlikely to have to load a way greater than a hemisphere. :) cheers Richard _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/dev
