[Imports] RFC for City of Basel Suburb Import
Rafael Avila Coya
ravilacoya at gmail.com
Sat Dec 30 16:40:33 UTC 2017
On 30/12/17 10:14, Johannes Singler wrote:
> Am 29.12.2017 um 21:47 schrieb Rafael Avila Coya:
>> The rule is that each segment should have as admin_level the highest
>> level of all the admin divisions it belongs to.
> I don't see this rule documented in
> Can you please add it there? Also, JOSM did not warn me about the
> missing admin_level.
It is documented here: http://wiki.openstreetmap.org/wiki/Relation:boundary
>> Although a bit off-topic, I have seen that all boundaries in
>> Switzerland need some corrections. When looking at level 9 entities, I
>> checked for example Jorat-Menthue (admin_level=8), in District du
>> Gros-de-Vaud (6), Canton of Vaud, that is divided in 5 admin_level=9
>> entities. I saw that this Jorat-Menthue is duplicated (2 relations)
>> . > It would be nice
>> that an experienced user of the Swiss OSM community has a check
>> nation-wide to correct this and other errors.
> What other errors do you see? Can you tell me an Overpass query that
> your insights are based on?
Sorry: I wanted to say "... to correct this and other **possible**
As I was just looking for an example of admin_level=9 administrative
divisions and I found that duplicate example, I find it quite probable
that there might be other mistakes here and there. It's only a guess,
and in any case I am quite sure this happens with mostly all countries.
Sometimes errors come from newbies who don't know really how to handle a
The overpass to download all administrative boundaries of Switzerland
that I used is:
Running the JOSM validator I can give you some error examples:
1. Heimiswil  in Canton Bern has 470 duplicated nodes.
2. Bonfol  and Vendlincourt  nodes, that are duplicated as members
of their respective relations with label and admin_centre roles.
3. Zürich airport area  is tagged as boundary=administrative, and
crossing the boundaries it finds on its way.
4. Apart of Zürich airport, there are other 4 boundary=administrative
segments around Switzerland without the admin_level tag. One exemple is
this one , that belongs to 2 admin_level=6 entities, 2 admin_level=8,
1 admin_level=9 and 1 admin_level=10.
The rest of the errors, like 25 unclosed boundaries, you can get them
from the JOSM validator.
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