[OSM-talk-be] Completing the belgian postal code boundaries

[Jonathan Beliën]

Excellent initiative Pieter !

I think we should also check with the official postal code dataset from *bpost* !
The dataset itself is useless (not open data and bad geometry) but I think it can be used to visually compare.

You can view that dataset here : https://www.geo.be/catalog/details/2b1a3840-5263-11ea-acd1-34e12d0f0423?l=en

There are some "weird" postal codes situation that geometry based on addresses won't take into account.

Have a nice evening.

Jonathan Beliën


Jeu 09 déc 2021, à 17:55, Pieter Vander Vennet a écrit :
> 
> PS: The tagging for a postal code boundary relation is: `type=boundary; boundary=postal_code; postal_code=*`. Alternatively, if a postal code aligns 100% with an administrative boundary, one can also add `postal_code=*` on it.
> 
> addr:postcode or addr:postalcode are incorrect for this purpose - there are still a few of those out there, but I'm gradually cleaning them up.
> 
> Kind regards,
> Pieter
> 
> On 09.12.21 17:49, Pieter Vander Vennet wrote:
>> 
>> Hi all,
>> 
>> Recently, I got the challenge to get all postal codes in Belgium. Turns out that there is no open dataset available to do this (yet).
>> 
>> 
>> OpenStreetMap already got me a long way (hooray!) but Wallonia is still a bit... lacking and has big holes. Time to fix this!
>> 
>> (Of course, I also setup a MapComplete theme with the postal codes <https://pietervdvn.github.io/mc/develop/postal_codes.html?z=9&lat=50.51866&lon=5.158081&fs-export=true&language=en#relation/224757>)
>> 
>> So, after some talk on Matrix, I downloaded an Open Address dataset <https://opendata.bosa.be/index.nl.html> (with postal codes) of Wallonia. A few scripts later, I had a geojson of addresses for every postal code, which I then could run through a convex hull algorithm, getting the boundaries of each postal code with an open license... 
>> 
>> 
>> 
>> The last step is to get these outlines integrated into OSM. While it is quite fun to map, adding a few hundred of them is a bit too much work, which is why I'm asking you all for some help. If you have experience with JOSM and have spare time, please, pick out a few postal code boundaries and add them.
>> 
>> *How to add a postal code boundary*
>> 
>> 
>> 1. Grab the dataset over here
 <https://github.com/pietervdvn/pietervdvn.github.io/blob/master/missing_postal_code_boundaries.geojson>2. Load the data into JOSM
>> 3. Download the OSM-boundary data of the relevant area (e.g. with the 'query overpass'-mode in the download field)
>> 4. Create a multipolygon-relation, reusing already existing border lines of create a new line alltogether. *It is discouraged to use the actual geometry, as they can be jittery and jump from address point to address point
*5. Upload the data
>> 6. ????
>> 7. Profit!
>> 
>> 
>> Kind regards,
>> Pieter
>> 
>> 
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