[OSM-dev] Tagging of multipolygons with holes within holes
Frederik Ramm
frederik at remote.org
Wed Oct 17 08:40:34 BST 2012
Hi,
On 10/17/12 08:15, Igor Brejc wrote:
> But the problem is in how to handle tagging in this case. The existing
> wiki "rules" describe only the tagging of top outer rings, but they
> don't mention how to handle various cases/combinations of tagging holes
> within holes.
The area of the "hole within the hole" does not require special tagging,
as it is covered by the multipolygon itself. If you have a forest with a
hole in a hole, then that hole in a hole is forest as well.
If you are, on the other hand, thinking of a "lake in the middle of a
meadow in the middle of a forest" situation, then this is not "hole in a
hole" - the forest has one hole which is the meadow, and the meadow has
one hole which is the lake. You would have three ways:
F - tagged as forest
M - tagged as meadow
L - tagged as lake
and two multipolygons
MP1: outer=F, inner=M
MP2: outer=M, inner=L
You have the option of leaving F and M untagged and attaching the
forest/meadow tags to MP1 and MP2 instead.
Bye
Frederik
--
Frederik Ramm ## eMail frederik at remote.org ## N49°00'09" E008°23'33"
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