Hi Jon, I started to summarize this on the wiki and realized something...
> documented. The algorithm osm2pgsql uses is to gather together all the > tags which are related to the polygon feature (e.g. landuse=, natural= > etc) and then compare those against the outer ways. If the way and > polygon match then it will exclude the way. If they do not match then > the way will be included. What is the precise definition of "match"? > As above, the way needs to be exluded if it is untagged or is the same > as the polygon. If it is different then it does need to be rendered. The implication of this is: a way might be "its own area" with regarding to one set of tags and "part of a multipolygon" with another. If I tag an outer boundary as "park" and it forms the outer boundary of a forest multipolygon that has holes, the park covers the area of the forest, plus the hole. I think I need to understand the tag-matching rules to figure out the right thing to do. cheers Ben -- Scenery Home Page: http://scenery.x-plane.com/ Scenery blog: http://xplanescenery.blogspot.com/ Plugin SDK: http://www.xsquawkbox.net/xpsdk/ X-Plane Wiki: http://wiki.x-plane.com/ Scenery mailing list: [email protected] Developer mailing list: [email protected] _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
