Where to get polygons for german postcodes (from OSM, in GeoJSON)?

Question

I want to draw a choropleth map based on german zipcode areas and some data. It should look like this, just down to zipcodes: https://maps.aimpulse.com/osm/addresses/

I asked the osm irc channel and have been told that it might even be possible with leaflet.js

So I read a bit here and there but I couldn't even find any starting point.

So any ideas are welcome.

---

Edit: Thanks to the answer and comment so far I think my main question is:

How do I get a list of german zipcode/postcode areas, with the corresponding coordinates for the polygons?

According to the irc channel, OpenStreetMap (OSM) has this data, and it should be possible to have it in GeoJSON format.

Answer 1

Yep, you could/should use leaflet.js.

You simply can create a map and add osm as TileLayer. After adding OSM tilelayer you can add your zipcode information. The question is: how do you get them?

If you have the data as file (geojson) you can add a geojson layer. leaflet.js has many other options to add the zipcode information.

I am quite sure that leaflet.js can do the trick.

So you can start with:

var map = L.map('map').setView([50.106545, 8.638599], 15);

L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
    attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);

Now it depends on your zipcode-data how to implement them in leaflet.

Answer 2

Now I get it! Getting those information is quite difficult!

You can try getting the zipcodes from the "Geoportal" - probably using the search word "Verwaltungsgrenzen". Otherwise you can have a look at the OSM Boundaries. But those informations are incomplete.

The german "post office" also hold those data, but this might be expensive!

Answer 3

I've found this repository with that information, I don't know if it is updated but works.