[Tagging] Add some tag to identify disputed borders
selfishseahorse at gmail.com
Fri Nov 23 16:50:02 UTC 2018
On Fri, 23 Nov 2018 at 17:35, Eugene Alvin Villar <seav80 at gmail.com> wrote:
> On Wed, Nov 14, 2018 at 5:30 PM SelfishSeahorse <selfishseahorse at gmail.com> wrote:
>> 1. 'inner' roles (and thus 'outer' roles too) are still needed in case a country has enclaves.
> Even if a country has exclaves and/or has enclaves within it, you still don't need to have "inner" and "outer" roles at all in order to make sense of the (multi)polygon. They are there as a hint to fix hopelessly broken multipolygon relations, but if such a relation is not broken, the "inner" and "outer" roles are actually superfluous. For instance, the program osm2pgsql actually has a check function named "check_inner_outer_roles" to identify relation member ways having the wrong roles in a type=multipolygon or type=boundary relation. It is able to do this check precisely because it is able to analyze a multipolygon relation and be able to infer the correct roles for itself.
> We should be therefore able to repurpose the roles in a type=boundary relation to store information about claimed, "de facto", and "de jure" borders.
>  https://github.com/openstreetmap/osm2pgsql/blob/93b73e5f5c3b20e80027ecf272f553d26f49f2e8/contrib/libosmium/osmium/area/detail/basic_assembler.hpp#L172
Thank you for this information and for correcting me!
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