Hi, On 07/13/2012 04:59 PM, nimix wrote:
If I remember it right mapnik requires normalized geometries, so outer in clockwise and inners in counterclockwise order. I'm not sure if that is still the case, but osm2pgsql still does the normalization. That's why I defined the result in clockwise orientation...
Mapnik doesn't require that as far as I know (have to check though). However, if you e.g. create a shape file and open that in ArcGIS and compute the polygon area, it will come up with negative areas if your polygon goes the wrong way round.
I don't know if that is an ESRI curiosity or following the standard, and if so, what standard. If it should turn out to be a convention for shape files but not for Simple Features generally, then any program that creates shape files should fix the winding order.
Bye Frederik -- Frederik Ramm ## eMail [email protected] ## N49°00'09" E008°23'33" _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
