On Tue, Oct 2, 2018 at 4:39 PM Kevin Kenny <kevin.b.ke...@gmail.com> wrote:
> On Tue, Oct 2, 2018 at 11:15 AM Paul Allen <pla16...@gmail.com> wrote: > >> Why selecting buildings and tagging them to site relation is easier > than selecting building and adding them to a multipolygon realation? > > Are you labouring under the misapprehension that a multipolygon has to > have a single outer ring? Sorta. As I read it the outer ring is a polygon. That polygon might be composed of several different ways but together they form an continuous outline. You appear to be saying that I can have several disconnected outer polygons. Even if I can, it still doesn't really work well for Edinburgh Uni. > That's a single multipolygon, and that's the approach that I'd use for > the sprawling campus that > you describe. > Then I described it badly, and/or you gave the map a very brief glance. It is NOT a sprawling campus. It is a city with isolated university buildings in it. So you'd walk along a public street and encounter a house, a butcher occupying the ground floor of a house with flats above, a bookshop occupying all four floors of a house, a house that is now the department of music, a toy shop occupying the ground floor of a house, etc. Repeat that many times over. It's NOT a campus, it's a city with university buildings scattered here and there. Well, one tiny part of the city is a mini-campus to the extent that there are several university buildings and no non-university buildings in a small area, but otherwise it's isolated university buildings in a sea of non-university buildings. Even if a multipolygon can have many disconnected outers, it seems I'd have to make each university building an outer. And then there are no inners. So even if it can be done that way, it seems like an abuse of the concept, which I thought was to be able to punch exclusionary holes in areas. -- Paul
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