Hi Dane, http://trac.mapnik.org/ticket/503
I've tried using a bigger box in postgis.cpp and it work ok. I'm now sending the 'tol' parameter from mapnik.cpp by just modifiying the features_at_point() method definition and implementation, so that the 'tol' parameter is compulsory. In order to send a patch for inclusion, is this the way to go or do you want any other strategy to be implemented? Also, I would like to allow to specify the parameter through configuration (overwrite default tolerance) on a per layer basis, is that ok? Which branch / tag should I follow for fixes? Thanks in advance! ________________________________ De: Dane Springmeyer [mailto:[email protected]] Enviado el: miércoles, 27 de enero de 2010 20:29 Para: Clos Crespo, Manel CC: [email protected] Asunto: Re: [Mapnik-users] GetFeatureInfo tolerance Manel, Nice catch. Could you file a ticket on this at trac.mapnik.org? Seems we do need a tolerance for the features_at_point() query as well when querying point geometries. It would be good to audit the other datasource plugins at the same time as this support is added to the PostGIS plugin. Thanks, Dane On Jan 27, 2010, at 4:04 AM, <[email protected]<mailto:[email protected]>> <[email protected]<mailto:[email protected]>> wrote: Hi, I've two layers in PostGIS: multipolygon and point. When using GetFeatureInfo I successfully get results for the polygon layer, but it is _very_ difficult to get results for the point layer. One needs to click _exactly_ on top of the point and still you won't be able to get results most of the time. Using mapnik 0.7.0. I've tracked this down to map.cpp, Map::query_map_point(), where the number of features returned is 0 for the point layer: featureset_ptr fs = ds->features_at_point(mapnik::coord2d(x,y)); int count = 0; while (fs->next()) { count++; } std::clog << "--> num features = " << count << "\n"; ... and is 1 for the polygon layer. So, this happens _before_ the "hit_test_filter". Looking at plugins/input/postgis/postgis.cpp, features_at_point(), I can see the envelope has no "margin" or "radius" or "tolerance". Envelope<double> box(pt.x,pt.y,pt.x,pt.y); std::string table_with_bbox = populate_tokens(table_,FMAX,box); Is there a tolerance that can be specified in postgis? how can I solve this? Thanks in advance! Manel Clos UMAT - 972419417 Ajuntament de Girona _______________________________________________ Mapnik-users mailing list [email protected]<mailto:[email protected]> https://lists.berlios.de/mailman/listinfo/mapnik-users
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