Beginner question - simple spatial search

3xca1ibur · **Joined:** Tue Nov 09, 2010 12:45 pm **Posts:** 7

Hi,

I have been searching around for the last day (badly) to try to find some help on how to use Lucene-Spatial within my application.

I am using GWT so I would like to keep the client side clear of org.apache.* packages as GWT tries to serialise everything on the client side. (made this tutorial less useful : http://java.dzone.com/articles/spatial-search-hibernate?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+javalobby/frontpage+(Javalobby+/+Java+Zone))

Basically I have an address object with a field "latitude" and a field "longitude" and I would like to do distance searches against this, is lucene-spatial the right way to go or should I look more into doing it in another way?

So far I have got to :-

Code:

DistanceQueryBuilder dq = new DistanceQueryBuilder(new Double(point[1]), new Double(point[0]), 10d,
                  "activity_locationName_latitude", "activity_locationName_longitude",CartesianTierPlotter.DEFALT_FIELD_PREFIX, true);
            
            FullTextSession fullTextSession = Search.getFullTextSession(session);
            
            org.hibernate.Query fullTextQuery = fullTextSession.createFullTextQuery( new ConstantScoreQuery(dq.getFilter()) );

But I dont understand what "CartesianTierPlotter.DEFALT_FIELD_PREFIX" is meant to actually be, and as such my result set comes back empty.

Cheers,
Rob

hardy.ferentschik · **Posted:** Tue Feb 15, 2011 2:29 am

This is really more of a Lucene question than a Hibernate Search question. Have you tried asking the question on the lucene forum and/or mailing list.
Using a distance query sounds like the right thing to so, but personally I don't have any experience with the Lucene Spatial API. There might of course be something wrong with your Search setup, but given the context you gave it is hard to tell.

--Hardy

3xca1ibur · **Joined:** Tue Nov 09, 2010 12:45 pm **Posts:** 7

Thanks for the quite reply. I think there is something wrong with my search setup. I am trying a slightly different approach now and have a hibernate related question instead. I will update here when I have it resolved. I started a new post for the other question as it is different enough, if you have a second to look at it it would certainly be appreciated :https://forum.hibernate.org/viewtopic.php?f=9&t=1009561

Cheers,
rob

sanne.grinovero · **Posted:** Tue Feb 15, 2011 8:28 am

Hi, sorry I couldn't find a reference to the details, but I remember someone was using Spatial just fine with Search.
The way spatial works is by encoding x and y coordinates in two different fields, which have a name with a common prefix. This CartesianTierPlotter.DEFALT_FIELD_PREFIX should be the shared prefix (default), so basically to have it working you have to make sure the field names Search uses to index your entity match the field names the DistanceQueryBuilder is looking for: I'd suggest you log/debug DistanceQueryBuilder to find out the exact field names, and verify using Luke (nice tool to look into your index) that the field names you're using to encode x/y (latitude/longitude) are matching. (@Field annotation as a name attribute so you can override it for these purposes)

Shouldn't be hard, but still if you could post a working example as future reference for others that would be great.