[OSM-newbies] Interior ring with Potlatch? (Randy)

[Aspen Swartz]

>   12. Re: Interior ring with Potlatch? (Randy)
>
>
> ------------------------------
>
> Message: 12
> Date: Thu, 10 Dec 2009 18:09:44 +0000 (UTC)
> From: "Randy" <rwtnospam-newsgp at yahoo.com>
> Subject: Re: [OSM-newbies] Interior ring with Potlatch?
> To: newbies at openstreetmap.org
> Message-ID: <hfrdh6$mhs$1 at ger.gmane.org>
> Content-Type: text/plain; format=flowed
>
> Steve Bennett wrote:
>
> >On Thu, Dec 10, 2009 at 4:45 PM, Randy
> ><rwtnospam-newsgp at yahoo.com> wrote:
> >>JOSM Validator has flagged one of those in my area. I think the tips of
> >>the "C" may be overlapping a little, but I haven't gotten around to
> fixing
> >>it yet. A multipolygon is, I believe, the best practice in this case,
> >
> >Undoubtedly.
> >
> >>since your "pseudo wall" isn't really an exterior part of the building.
> >
> >Oh, I didn't know they had to be. What do you do when there's a
> >complex of clearly distinct buildings that touch each other? I thought
> >tagging them separately (but sharing ways) was the right thing to
> >do...
> >
> >Steve
>
> Concede. "Exterior" was not a good word to use here, I was being lazy. How
> about "building boundary demarcation"? (Whether you agree with the intent
> of the statement or not.) Even though the building will be rendered as a
> whole (with a hole), the underlying data will indicate a discontinuity.
>
> Regarding using a single way for multiple purposes, this is done quiet
> often, and I think very appropriate. However, I think the mapper should
> consider the potentially common boundary when doing this. Are either side
> of the boundary mutually exclusive? That's definitely a case for a common
> boundary. If the purposes of the potentially common way are unrelated,
> e.g. a highway and an area boundary, then is the area boundary likely to
> move if the highway moves? If yes, use a common boundary. If the two uses
> are not exclusive, and the relocation of one will not necessarily require
> the relocation of the other, then I think separate ways should be used.
> That will certainly ease the effort of the mapper who may eventually have
> to move one and not the other.
>
> --
> Randy
>
> Where two buildings share a wall, it's called a "party wall" or "demising
wall" to distinguish it from an interior wall or exterior wall.  Just in
case you were curious.

Aspen (eulochon)
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