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openstreetmapoverpass-api

Getting building data at a coordinate

I would like to be able to click on a building on a map and get the polygon that comprises the building at the clicked coordinate.

I looked into overpass api and tried the following:

<query type="way">
  <around lat="51.0566036" lon="13.7181033" radius="30"/>
  <has-kv k="building"/>
</query>
<union>
  <item/>
  <recurse type="down"/>
</union>
<print/>

If I choose a large radius I get too many buildings. If the radius is too small I don't get any buildings. Using bbox-query did not help.

I also tried coord-query, but I was not able to construct a meaningful query. The necessary query syntax seems to be different.

Is there a better approach at hand? Even withouth overpass, I have just to look into it.

Solution

  • What you try to realize is a 'reverse geocoding'. To avoid the mentioned problems (AFAIK) usual implementations use an arbitary radius and then test the resulting shapes once more if they contain the desired position.