[Talk-us] tagging a national forest boundary

Nathan Edgars II neroute2 at gmail.com
Fri Oct 1 03:50:50 BST 2010


On Thu, Sep 30, 2010 at 9:52 PM, Greg Troxel <gdt at ir.bbn.com> wrote:
> I think you two might be talking past each other.
>
> I am slightly fuzzy on multipolygons, but I think the notion is that a
> multipolygon has a number of outer rings, and a number of inner rings,
> and it defines the area that consists of points within an outer ring and
> not within an inner ring.
>
> So in the national forest/inholdings case, I think you have a polygon
> (closed way) that is the boundary (typically drawn strongly on a
> traditional topo), labeled as the forest boundary.  Then you have a
> polygon for each inholding, with no particular tags required.  And then
> a multipolygon with the forest boundary as outer and all the inholdings
> as inner.

Bloody hell, I know this. The problem is that some of the inholdings
touch the boundary, so they're actually outer ways (and the portion of
the boundary there is nothing):
http://www.openstreetmap.org/?lat=28.99352&lon=-81.64891&zoom=15&layers=M&relation=1202373
Yet the boundary is still something official.



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