regions-topojson

Example with french regions : https://github.com/laem/regions-topojson/blob/master/france/lala.json

Follow these steps to get them for other countries :

create a file named my-country.xml.

Just change FR for DE to get german regions for example, and check http://wiki.openstreetmap.org/wiki/Tag:boundary%3Dadministrative to get the 'admin_level' that you need.

<osm-script timeout="1000">
  <!-- gather results -->

  <id-query into="searchArea" ref="3600365331" type="area"/>
  <union>
    <query type="relation">
      <has-kv k="admin_level" modv="" v="8"/>
      <area-query from="searchArea" ref=""/>
    </query>
  </union>

  <!-- print results -->
  <print mode="body"/>
  <recurse type="down"/>
  <print mode="skeleton" order="quadtile"/>
</osm-script>

then run this command...

wget http://www.overpass-api.de/api/interpreter --post-file=my-country.xml -O country.osm

after waiting few minutes (depending on size), you will get one file from the API, proceed by installing:

npm install osmtogeojson
osmtogeojson my.osm > MYREGIONS.geojson

You can stop here and use geojson, but files will be huge. Simplify them with topojson :

npm install -g topojson
topojson -o lala.json MYREGIONS.geojson -q 10000 --simplify-proportion 0.02 -p

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