On 21/09/2018 00:31, Warin wrote:
On 21/09/18 06:11, Jem wrote:
Thank you both. That's very helpful.
On Thu, 20 Sep 2018 at 22:25, Dave F <davefoxfa...@btinternet.com
<mailto:davefoxfa...@btinternet.com>> wrote:
Hi
Short answer: Yes
There's a few problems here:
Relations should not be used to collect thing together.
? That is what they can be used for. See the site relation as an example.
This reinforces my point. Site is repeatedly used to form unnecessary
collections of things (such as braces of bus stops, one on each side of
the road which already share the same name:
https://www.openstreetmap.org/relation/2726555)
...or by people who are unaware OSM is geospatially aware. Note the
'site' example given on the wiki: "Relation to group elements of a site
such as a school together.". If the school has a amenity=school polygon
boundary, which it should, everything within it is a part of that school.
It wouldn't be so bad if people didn't give up half way through creating
them.
There shouldn't be tags on the ways which conflict with those in
the relations
True.
MP relations require a 'type' tags and 'inners' & 'outers' roles
True
In this case the Southern section shouldn't be a polygon
Did not look.
Clarification: It shouldn't be a part of the multipolgon relation. It
should still be a polygon.
MP relations should be restricted to the areas which have inners:
https://www.openstreetmap.org/relation/2571440#map=19/51.15275/-2.05045
No. They can be used to collect a series of outer ways to form the
boundary of a feature e.g. an administration boundary usually shares
ways with adjacent administrations.
Clarification: I was referring to specific examples of river MP's to
include islets. It makes it much easier to maintain if the relations are
kept as small as possible around any inners. If the MPs are large, some
contributors mistake them as untagged ways and add duplicating tags to
them. To help avoid this confusion I add a note tag to the way:
https://www.openstreetmap.org/way/431275464
Cheers
DaveF
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