[Talk-GB] Grouping related buildings in a relation

[Richard Mann]

Also, if you use multipolygons, make sure you don't accidentally put
"Inner" instead of "inner" as a role, because Mapnik will then use the
name of the "Inner" area for the whole thing :)

If it's got two "outer" areas (an advanced multipolygon), Mapnik will
happily take the name from the relation and apply it to the two areas
(subject to space constraints). However, Osmarender doesn't seem to
draw multipolygons with multiple outer areas (let alone apply names).

Richard

On Fri, May 28, 2010 at 12:05 PM, Graham Stewart <graham at dalmuti.net> wrote:
>
> Thanks Jerry,
>
> I've found the trouble with using areas is that sometimes the related
> buildings aren't within an easily definable area and may be spread across a
> few different streets with other buildings between them.
>
> This seems very common with large teaching hospitals or university
> buildings. That's why I was tending towards a relation - and because that's
> what the wiki said obviously :)
>
> Thanks for the tip on multipolygon, I hadn't considered that.
>
> GrahamS
>
>
>
>
> On Fri, 28 May 2010 10:51 +0000, "Jerry Clough - OSM" <sk53_osm at yahoo.co.uk>
> wrote:
>
> Hi Graham,
>
> I usually draw an area for the hospital campus and then mark individual
> buildings=yes, rather than using a relation. (This may stem from what I
> found to work when I started out).
>
> In the relation I don't think you need the building=yes, but you probably do
> need something like type=multipolygon.
>
> Cheers,
>
> Jerry
>
> ________________________________
> From: Graham Stewart <graham at dalmuti.net>
> To: OpenStreetMap TalkGB <talk-gb at openstreetmap.org>
> Sent: Fri, 28 May, 2010 11:29:44
> Subject: [Talk-GB] Grouping related buildings in a relation
>
> What is the correct way to group a collection of buildings into a
> relation when they are all part of the same institution?
>
> I traced (from OS StreetView) the seven buildings of the Queen Elizabeth
> Hospital in Gateshead:
> http://www.openstreetmap.org/?lat=54.93834&lon=-1.57941&zoom=17&layers=B000FTF
>
> I've tagged each building as building=yes and placed them in the
> relation.
> Then I tagged the relation as amenity=hospital+building=yes+name=Queen
> Elizabeth Hospital
>
> But now Mapnik and Osmarender don't display a name or the hospital POI
> icon, which rather defeats the purpose.
>
> What is the usual approach to this?
>
> The Wiki for amenity=hospital suggests:
>
> "If you have a large hospital campus with multiple buildings, consider
> combining them into a relation instead of tagging each individual
> building to be a hospital"
> -- http://wiki.openstreetmap.org/wiki/Tag:amenity%3Dhospital
>
> ..which I thought was what I had done. Should I also add a POI node with
> amenity=hospital somewhere amongst the buildings? That seems a bit
> redundant.
>
> Thanks,
> GrahamS
>
> PS I'm a new OSMer, so apologies if this is really obvious.
>
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