How to get the district/city/municipality given a gps position as well as the corresponding polygon

General talk
1

Hey everyone,

I would like to get the boundary as a geojson file or something similar given the gps info of a point and then extracting the district, city, municipality

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So far I found out about nominatim to get data like the municipality now I’m wondering how I get the polygon from this information.

The info I get from nominatim is the following:

{"place_id":100891653,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. http://osm.org/copyright","osm_type":"way","osm_id":6243831,"lat":"59.385659776299605","lon":"18.30840420631662","class":"highway","type":"residential","place_rank":26,"importance":0.10000009999999993,"addresstype":"road","name":"Karlsuddsvägen","display_name":"Karlsuddsvägen, Karlsudd, Vaxholm, Vaxholms kommun, Stockholm County, 185 33, Sweden","address":{"road":"Karlsuddsvägen","hamlet":"Karlsudd","town":"Vaxholm","municipality":"Vaxholms kommun","county":"Stockholm County","ISO3166-2-lvl4":"SE-AB","postcode":"185 33","country":"Sweden","country_code":"se"},"boundingbox":["59.3833860","59.3878843","18.2967468","18.3278196"]}

using: https://nominatim.openstreetmap.org/reverse?format=json&lat=59.3855&lon=18.3084

Thanks in advance for any further pointers to get the boundaries.

1 Like
2

Do you know the overpass api?

Have you used that api to find a relation that your coordinate is inside?

Have you checked that relation for the admin_level or border tag to find your city, district or municipality?

3

See Overview - Nominatim Documentation (yes you can get the polygon), the nice thing about Nominatim is that it builds as far as possible hierarchies from the OSM data.

4

I’ve just started with the overpass api today a bit. I’m unsure how to get the admin levels from the data like town or municipality that I got from nominatim.

5

What admin_level are you looking for? Relations are tagged with admin_level. This relation has the admin_level of the state Lower Saxony and this of the city Hannover.

Please make sure that the admin_levels differ from nation to nation.

6

Yes that is the current problem I’m having as I would like to get the boundaries of all the levels mentioned in here:

So from Vaxholm, Vaxholms kommun as well as from Stockholm County and potentially of Sweden as well. I read that the admin_level depends on the country but is there a mapping to see that admin_level for municipality is 7 for example?