On Wed, Oct 17, 2012 at 9:40 AM, Frederik Ramm <[email protected]> wrote:
> > 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. > True, but you need to determine that geometrically (see my previous answer) and then apply the tagging rules down the "holes hierarchy". > > 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 > Yes, if you split it in two separate multipolygons, then it's clear. But the problem is that Wiki does not explicitly forbids (just recommends not to) doing it all in a single multipolygon, quote: Such cascading is still recommended when the "island" in the middle is > something else than the area on the outside, but where the "island" is the > same stuff it can just be made a hole in the hole. Igor
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