[OSM-dev] Getting information from relations.

Graham Jones grahamjones139 at gmail.com
Sun Jan 22 17:22:23 GMT 2012

I think that osm2pgsql stores relations in the relevant line or polygon
table with an id of -1 * the relation ID - try searching for relations with
negative IDs and see if that is what you are looking for.



On 22 January 2012 17:16, Morten Olsen Lysgaard <morten at lysgaard.no> wrote:

> Hi.
> I'm currently running a project on open aviation data.
> In it I'm planning to use relations for some of the information.
> There's just this catch: When i show the map i let users click features to
> show a popup-box with all the tags that this object has.
> Up till now I've achieved this by serving my map as a WFS layer.
> The WFS layer reads a database from a osm2pgsql sync. In this sync, no
> information about relations seems to be kept. That means that when I now
> want to move some of my data over to relations, there's no way to let users
> see the tags that are in the relation.
> Is there any other way to achieve this, in short, this is what I want.
> When a user clicks on something on my map, information must be shown of
> what tags that object and any relation it's a part of has.
> I'm willing to do anything. I know there exists something named WMS
> GetFeatureInfo, but I'm not sure how it ties together with openstreetmap.
> Thanks in advance, Morten.
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Graham Jones
Hartlepool, UK.
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