[Tagging] How to tag named group of named water areas?

Dave Swarthout daveswarthout at gmail.com
Wed Nov 7 07:27:21 UTC 2018

It's true. Gerd and I have gone round and .around on this topic. Gerd has
tried to convince me that I should not remove any tags of the ways
contained in the existing Alaska pipeline relation and I'm convinced that
the only tags that belong on those ways are the ones that make that
particular way different from any other ways. Hence, tags like location,
and bridge, properly belong on the ways. Obviously, you can't include
bridge=yes and layer=1 in any top level relation. Those sorts of attributes
belong on the way and only on the way. I have tried to convince him that
any attribute or characteristic that applies to the pipeline in its
entirety, belongs on the relation and not on the pipeline way itself. It
doesn't hurt to have them there but it's unnecessary and I also argue,
having those duplicated tags makes maintaining the relation rather messy.

I provided two examples from the Wiki and a part of a response earlier in
this thread from Kevin Kenny to support my argument that state that
individual ways in a multipolygon or relation should not be tagged unless
their characteristics require it.  If you're working with a route=road and
the surface changes, you split the way and mark it so. Same with maxspeed
or number of lanes. The characteristics are those of the way, not the
entire route, and rightly belong only on the way.  In the case of the
pipeline, tags like man_made=pipeline, substance=oil, operator, Wikipedia
and Wikidata tags, belong in the relation. The people who first added the
pipeline to OSM did it both ways, probably to guarantee that it would be
visible to OSM or other data consumers, but I don't know.

I believe the people that cautioned us in the Wiki, people that I assume
know more about it than either Gerd or me, to add tags to a way contained
in a relation only when its characteristics or attributes are different
from the overall route characteristics. I take their meaning literally.
Gerd disagrees but gives no proof for his assertion.

So there you have it. We're stuck.


On Wed, Nov 7, 2018 at 12:27 PM Gerd Petermann <
gpetermann_muenchen at hotmail.com> wrote:

> Hi all,
> after reading the last comments in this thread I tried again to convince
> Dave that the rather special rules for multipolygon relations cannot be
> used
> for all types of relations, esp. not those with route=pipeline and that he
> should not remove tags like man_made=pipeline from ways of such a relation,
> see this long discussion:
> https://www.openstreetmap.org/changeset/64027881
> I give up now because for me a type=multipolygon relation is something
> completely different and Dave insists that it is are not. Seems we are both
> frustated now :-(
> Gerd
> --
> Sent from: http://gis.19327.n8.nabble.com/Tagging-f5258744.html
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Dave Swarthout
Homer, Alaska
Chiang Mai, Thailand
Travel Blog at http://dswarthout.blogspot.com
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