[OSM-dev] Problem with XAPI and ref based search

Grégory Bataille gbataille.dev at gmail.com
Sat Nov 30 08:50:28 UTC 2013


Damn, I had never been able to find the QL language API. I guess that's
exactly what I was looking for.
thanks for the pointer, I should be able to handle it from there :)


On Sat, Nov 30, 2013 at 9:44 AM, Roland Olbricht <roland.olbricht at gmx.de>wrote:

> hello everybody,
>
> > I start by asking XAPI to give me the France admin_level 2 object like
> so:
> >
> http://www.overpass-api.de/api/xapi?relation[boundary=administrative][admin_
> > level=2][name=France]
> >
> > this returns me the object, which contains among other things:
> > <member type="relation" ref="79981" role="outer"></member>
> > <member type="relation" ref="2202120" role="outer"></member>
> > <member type="relation" ref="2627308" role="outer"></member>
> > <member type="relation" ref="2177258" role="outer"></member>
>
> Please try recurse down:
>
> http://www.overpass-
>
> api.de/api/interpreter?data=(relation[boundary=administrative][admin_level=2]
> [name=France];>>;);out+meta;
>
> The XAPI syntax is restricted to very simple use cases, and even the
> question
> for "all members of a certain relation" cannot be formulated. So the
> solution
> is to use the more comprehensive Overpass QL language.
> The line
>
> relation[boundary=administrative][admin_level=2][name=France];
>
> searches for the relation (the same way as before) and
>
> >>;
>
> adds all members, members of members and so on of the last result. This
> gives
> the full pyramidal boundary construction. If this is too much data (these
> are
> more than 110 MB), you can resolve on step with
>
> http://www.overpass-
>
> api.de/api/interpreter?data=(relation[boundary=administrative][admin_level=2]
> [name=France];rel(r););out+meta;
>
> Here, "rel(r)" resolves only one level of relation members.
>
> Best regards,
>
> Roland
>
>
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>
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