[Tagging] Tagging request: unnecessary admin_level tags

[André Pirard]

On 2018-03-11 00:37, Eugene Alvin Villar wrote:
> On Sun, Mar 11, 2018 at 12:41 AM, André Pirard
> <A.Pirard.Papou at gmail.com <mailto:A.Pirard.Papou at gmail.com>> wrote:
>
>     Hi all,
>
>     Please all, take a very attentive look at this.
>     Please note the subject change: unnecessary.
>     Please note the disambiguation boundary vs borderline.
>
>     The problem with admin_level tags is that numbers need to exist to
>     *be **able* to nest boundaries and hence that only administrative
>     boundaries are nestable.
>     That problem does not exist with subarea relation roles [...]
>
>
> Subareas will not work for my country. We generally have the following
> hierarchy: region > province > city/municipality.
>
> However, we have two cases where a city inside a province is part of a
> different region from the rest of the cities and municipalities of
> that province. In this case, using admin_level=* to properly indicate
> the administrative boundaries in type=boundary +
> boundary=administrative relations is unavoidable.
Not at all.
Using an inner way role, a boundary area can have a hole in it: the hole
that your city makes in the wrong province
and that hole can be a subarea somewhere else in the tree: your city
must be a subarea of the right province.

I don't know the cities you speak of, but we have a similar case in Belgium.
Even a bit more complicated.
We use country > region > arrondissement> province > city/municipality.
Brussels capital is a city that doesn't belong to province Brabant where
it's in, not even Flanders where Brabant is.
Brussels-Capital belongs to Belgium directly as you can see in the part
of the quote that you removed.

If you look at France <https://www.openstreetmap.org/relation/2202162>,
you will see many subareas that are holes somewhere else.
>
>   * Relation Metropolitan France (1403916)
>     <https://www.openstreetmap.org/relation/1403916> as subarea
>   * Relation Guadeloupe (1401835)
>     <https://www.openstreetmap.org/relation/1401835> as subarea
>   * Relation Martinique (1891495)
>     <https://www.openstreetmap.org/relation/1891495> as subarea
>   * Relation French Guiana (1260551)
>     <https://www.openstreetmap.org/relation/1260551> as subarea
>   * Relation Réunion (1785276)
>     <https://www.openstreetmap.org/relation/1785276> as subarea
>   * Relation Mayotte (1259885)
>     <https://www.openstreetmap.org/relation/1259885> as subarea
>   * Relation Saint Pierre and Miquelon (3406826)
>     <https://www.openstreetmap.org/relation/3406826> as subarea
>   * Relation Saint Barthélemy (537967)
>     <https://www.openstreetmap.org/relation/537967> as subarea
>   * Relation Saint Martin (1891583)
>     <https://www.openstreetmap.org/relation/1891583> as subarea
>   * Relation Wallis and Futuna (3412448)
>     <https://www.openstreetmap.org/relation/3412448> as subarea
>   * Relation French Polynesia (3412620)
>     <https://www.openstreetmap.org/relation/3412620> as subarea
>   * Relation French Southern and Antarctic Lands (2186658)
>     <https://www.openstreetmap.org/relation/2186658> as subarea
>   * Relation Clipperton Island (2573009)
>     <https://www.openstreetmap.org/relation/2573009> as subarea
>   * Relation New Caledonia (3407643)
>     <https://www.openstreetmap.org/relation/3407643> as subarea
>
In the north of BE there are such holes belonging to NL and even some of
those NL hole have holes belonging to BE !!!

Subareas work for everything and they are a dream. One just has to
practice and understand them.

Cheers

André.




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