Thanks, but how easy would it be to use the two methods together(clustering and "declustering") when zooming to different levels(like Spatialkey.com) ? Maybe by using multiple levels?
Also, what about on the fly "cubic interpolation" of point values. It's not very computer intensive(Spatialkey.com use that as well on points). -Håvard 2011/9/22 Andrea Aime <andrea.a...@geo-solutions.it>: > 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 of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 _______________________________________________ Geoserver-users mailing list Geoserver-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geoserver-users
