AW: [mkgmap-dev] [PATCH] multipolygon

Sat Jul 11 11:21:20 BST 2009

Hello Carlos,

The easiest solution for your problem is to split the water area instead of
the outer way. So you should perform the following steps:

1. Join the three outer ways. This works in JOSM (don't try to upload this
to API 0.6).
2. Split the water area into several separate parts.
3. Only the area with the islands should be part of the multipolygon
relation.
4. Add the third island to the relation (currently it is not a part of it).
5. Copy the tags from the relation to the outer way and to the other areas
(mkgmap doesn't use the tags of the relation). See also the wiki page:
http://wiki.openstreetmap.org/wiki/Relation:multipolygon

Now you have simple areas and simple multipolygons and every renderer should
be able to display it correctly.

I will also try to improve my patch, so that multiple outer ways are joined
if they are parts of a longer way.

Rudi