2011/9/22 Håvard Wahl Kongsgård <haavard.kongsga...@gmail.com>: > Hi, I have a problem with overlapping points(identical XY). Googling I > found that Arcgis has a useful tool "Disperse Markers" which expands > clustered(overlapping points) > http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?id=1313&pid=1306&topicname=Disperse_Markers_(Cartography) > . Is a similar feature available in geoserver/openlayers for expanding > point clusters on the fly? The math behind it must be very simple, so > the alternative is to created a new geom in postigs with expanded > clusters.
There is a little trick you can employ. Text symbolizers in GeoServer can be associated to a graphic, which in the original intention was the "road plate", a background graphic that would be moved along with the label Now, if your label is empty space you can use label displacement to actually move away the points in a controlled way. The downside if you want is that if a new position cannot be found, not even by moving it around within the specified distance, the point won't be painted at all. Here is an example map with cities: http://demo1.geo-solutions.it/playground/GeoSolutions/wms?LAYERS=GeoSolutions%3Acities&STYLES=stars&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&SRS=EPSG%3A4326&BBOX=-0.59257250976506,38.661416015626,24.887332275391,51.617299804688&WIDTH=649&HEIGHT=330 and here is the same with the trick above: http://demo1.geo-solutions.it/playground/GeoSolutions/wms?LAYERS=GeoSolutions%3Acities&STYLES=displace&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&SRS=EPSG%3A4326&BBOX=-0.59257250976506,38.661416015626,24.887332275391,51.617299804688&WIDTH=649&HEIGHT=330 I guess you'll need to play a bit with it to get it right, but it may work. The full style is here: http://demo1.geo-solutions.it/playground/styles/displace.sld Cheers Andrea -- ------------------------------------------------------- Ing. Andrea Aime GeoSolutions S.A.S. Tech lead Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584 962313 fax: +39 0584 962313 http://www.geo-solutions.it http://geo-solutions.blogspot.com/ http://www.youtube.com/user/GeoSolutionsIT http://www.linkedin.com/in/andreaaime http://twitter.com/geowolf ------------------------------------------------------- ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2dcopy1 _______________________________________________ Geoserver-users mailing list Geoserver-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geoserver-users
