[Imports] RFC for City of Basel Suburb Import

[Rafael Avila Coya]

Hi, Johannes:

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
> https://wiki.openstreetmap.org/wiki/Key:admin_level
> 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) 
>> [2]. > 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** 
errors...".

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 
boundary relation.

The overpass to download all administrative boundaries of Switzerland 
that I used is:

[timeout:150];
(
node["boundary"="administrative"](area:3600051701);
way["boundary"="administrative"](area:3600051701);
relation["boundary"="administrative"](area:3600051701);
);
out meta;
 >;
out meta;

Running the JOSM validator I can give you some error examples:

1. Heimiswil [1] in Canton Bern has 470 duplicated nodes.

2. Bonfol [2] and Vendlincourt [3] nodes, that are duplicated as members 
of their respective relations with label and admin_centre roles.

3. Zürich airport area [4] 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 [5], 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.

Cheers,

Rafael.

[1] http://www.openstreetmap.org/relation/1682474
[2] https://www.openstreetmap.org/node/419894895
[3] https://www.openstreetmap.org/node/419894893
[4] https://www.openstreetmap.org/way/463409859
[5] https://www.openstreetmap.org/way/122946544

> 
> Johannes
> 
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