On Sat, Dec 11, 2010 at 11:27 AM, Hajo Kliemeck <[email protected]> wrote: > Hi, > > i want to filter against a circle, but the only thing i will always get > is a nullpointer exception. Any Ideas? I'm using GeoServer 2.0.2. > > <wfs:GetFeature xmlns:wfs="http://www.opengis.net/wfs"; > xmlns:ogc="http://www.opengis.net/ogc"; > xmlns:gml="http://www.opengis.net/gml"; version="1.1.0" > service="WFS"> > <wfs:Query typeName="mmw:germany-zipcode"> > <ogc:Filter> > <ogc:Intersects> > <ogc:PropertyName>the_geom</ogc:PropertyName> > <gml:CircleByCenterPoint numArc="1"> > <gml:pos>8.406452 49.393737</gml:pos> > <gml:radius uom="km">5</gml:radius> > </gml:CircleByCenterPoint> > </ogc:Intersects> > </ogc:Filter> > </wfs:Query> > </wfs:GetFeature>
We only support flat geometries made of straight segments, circle is not part of what GeoServer can understand. That said, the same filter can be expressed as a ogc:DWithin. However I see you are using mixed unit of measures, data in geographic coordinates, distances in km. We don't have good support for that either, as far as I know the only store that has code to properly support dwithin filters with a unit of measure is Oracle. In theory also PostGIS 1.5 would be able to natively support a dwithin filter on lat/lon data, afaik provided the column is defined as a geographic one, but the code to encode the proper sql is not there. For stores that do not have such a native ability I guess we could compute an approximate buffer in memory and then transform the filter into an overlaps/intersects one. I'd really love to add these missing abilities, but it would take a significant amount of time, so I guess that will have to wait until someone that can code GeoTools/GeoServer actually needs this ability in one of his projects, or someone provides funding to have the implementation happen Cheers Andrea ----------------------------------------------------- Ing. Andrea Aime Senior Software Engineer GeoSolutions S.A.S. Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584962313 fax: +39 0584962313 http://www.geo-solutions.it http://geo-solutions.blogspot.com/ http://www.linkedin.com/in/andreaaime http://twitter.com/geowolf ----------------------------------------------------- ------------------------------------------------------------------------------ Oracle to DB2 Conversion Guide: Learn learn about native support for PL/SQL, new data types, scalar functions, improved concurrency, built-in packages, OCI, SQL*Plus, data movement tools, best practices and more. http://p.sf.net/sfu/oracle-sfdev2dev _______________________________________________ Geoserver-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geoserver-users
