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

[Joseph Eisenberg]

Re: the Great Lakes -

Very large archipelagos, like "Indonesia" or "The Phillipines" or "The
British Isles", shouldn't be mapped as multipolygons because they would be
ridiculously huge. Generally the tag place=archipelago is used for small to
mid-sized groups of islands. Now, it is possible to map place=island
features as nodes and then select each node to make a relation, but mapping
islands as multipolygons seems to be preferred by most mappers, and that
type of relation is much more common and established than any of the
options for groups of islands.

Similarly, the Great Lakes are too big for mapping as a single
multipolygon, and each has its own name which is the locally-verifiable
feature.

A superrelation [which added each individual lake (or island) relation as a
member rather than individual ways] might be possible even for large lakes
and large island chains, since it wouldn't break every time 2 mappers tried
to edit the coastline/lakeshore at the same time. But there is no
established relation type for this, and handling relations-of-relations is
a huge pain for editing the map as well as for database users.

I suppose if there were a well-defined type of relations which only allowed
one level of relations to be nested inside of it (that is, all members had
to be a valid multipolygon) it might be usable, but it would still get
confusing.

-- Joseph Eisenberg

On Tue, Dec 15, 2020 at 9:12 AM Brian M. Sperlongano <zelonewolf at gmail.com>
wrote:

> Wouldn't it be more consistent to keep it in the same key, and call it
> place=lake_group?  Or even place=lakes?
>
> Would this be used for something like the Great Lakes in USA/Canada or is
> that too large of a feature?
>
> On Tue, Dec 15, 2020, 12:05 PM stevea <steveaOSM at softworkers.com> wrote:
>
>> +1.  Joseph's suggestion is a fine example of "OSM can and does coin new
>> tags on occasion."  Adding a nice boost, there is a suggestion that
>> "similar" tagging be used as an example of how to define / use / document
>> the new tag.  Great!
>>
>> On Dec 15, 2020, at 6:56 AM, Joseph Eisenberg <joseph.eisenberg at gmail.com>
>> wrote:
>> > Re: “ a couple of islets with a collective name”
>> >
>> > We have a tag for that: place=archipelago for a group of islands.
>> >
>> > There isn’t a common tag for a group of lakes with one name, probably
>> because this is only common in some countries, especially near the Arctic
>> region. We’ve talked about this issue before but did not find an existing
>> tag.
>> >
>> > I would suggest a tag like natural=lake_group to be added to a
>> multipolygon which includes each of the lakes, similar to how archipelagos
>> are mapped.
>>
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