[Tagging] How to put a name tag on an area with more than one type?

[Anders Torger]

Unfortunately I don't think that is possible.

Multipolygons may only contain ways that have either role as inner or as 
outer. It may not contain other relations (still possible to upload, but 
not considered right according to the wiki). What should the ways be?

We can't make the separate wetland parts as inner ways, (as areas formed 
by the inner ways are subtracted from the multipolygon), and even if we 
try it becomes illegal as inner ways cannot share segments with the 
outer way. We can't make the parts as outers either as they share 
segments. The outer must be the surrounding outline without the shared 
segments splitting the wetland in parts, and there are no inners (unless 
the parts themselves has inners).

So then we have a multipolygon with just an outer. I could just as well 
be a plain polygon made from a single closed way. This would work if 
drawing order was defined, and that was the method I tried first. The 
container polygon must have a natural tag as well (the logical would be 
wetland here without further sub-classification).

However the drawing order is not defined (I think, not 100% sure), so 
this is by the renderer interpreted as a wetland lying on top of the 
other wetlands. OSM-Carto will still render the insides, but the fill 
pattern of the outer polygon is drawn on top.

On 2020-12-11 18:09, Brian M. Sperlongano wrote:

> Hello Anders,
> 
> I would recommend creating a multipolygon relation (type=multipolygon) 
> with each of the wetland pieces, and set the name= and appropriate 
> natural= and wetland= tags on the relation.
> 
> On Fri, Dec 11, 2020, 11:11 AM Anders Torger <anders at torger.se> wrote:
> 
>> Hello,
>> 
>> I was on this list a while back expressing some frustration over
>> limitations when tagging nature and thought about getting involved in 
>> a
>> process for change, but I came to realize that it's not feasible for 
>> me
>> in my current life situation, so I've decided to continue be a normal
>> mapper as before, doing what I can do with features that exist today.
>> 
>> Anyway, if to be a mapper at all, I still like to solve some of my
>> naming issues in the best/least bad ways possible today. I'm currently
>> mapping a national park in Sweden, Muddus. It's in Laponia and 
>> consists
>> of mighty wetlands and old forest. These wetlands are named, like is
>> common in Sweden and Sami lands. For us navigating in wildlife, names 
>> in
>> nature are important.
>> 
>> A wetland polygon can be named in OSM, so the situation is better than
>> for example for named slopes (also common). However, a wetland here 
>> can
>> consist of both bog and marsh (and it's important to make the
>> difference, since one is easy to walk on, the other not so much). 
>> That's
>> two different natural types and thus can't be in the same multipolygon
>> (as outers).
>> 
>> Asking on OSM Help website for a solution I got the answer to make a 
>> new
>> containing multipolygon and set the name on that. That would be quite
>> elegant for sure, but JOSM warns about that, can't have a name without 
>> a
>> type, and if I set the type, say natural=wetland without any subtype, 
>> I
>> get a JOSM warning that I have natural features on top of eachother. 
>> If
>> I still upload it OSM-Carto does render out the name but you can see
>> that the wetland pattern of the outer polygon is drawn on top of the
>> contained polygons, so it does not seem to be the way to do it.
>> 
>> The least bad way I've come up with is to just name all polygons
>> belonging to the same wetlands the same, and hope for that in the 
>> future
>> smart renderers will understand that polygons with shared borders and
>> shared name is the same named entity.
>> 
>> Any ideas or suggestions?
>> 
>> /Anders
>> 
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