Peter Körner schrieb: > > Am 14.06.2010 21:07, schrieb Stephan Knauss: >> Peter Körner wrote: >>> I don't think it's necessary to use a tileserver for this style. You >>> could use the minutely updated postgis database to serve an openlayers >>> vector layer. >> Hm, it does not sound like a good idea to transfer 15.000 or more >> elements to be processed with openlayers. I saw this approach before, it >> required each user to download 1.5MB of POI-data. >> A lot more compared to the few kb of the bitmap layer that can also be >> cached. > You're not supposed to transfer all POIs at once but only those in the > current viewport. In higher zoom levels you need to aggregate all POIs > that are close to each other (eg. >1000km on a world-map) into a single > POI. You may vary this POIs' size with the number of single POIs aggregated.
Clustering seem difficult (http://docs.scipy.org/doc/scipy/reference/cluster.hierarchy.html#references) and I found no PostGIS function for it. So it seem necessary to work with random and a limit. >> Is there a specific reason why it's so difficult to get a custom >> rendering besides the scripts needed not existing? > It's that simple: we're no style hoster. STOP. I can't see a different between the existing surveillance layer and the smoking layer. Both have a lot of point objects and both are political maps. Our "sponsor" the "Verein" is political active and support democracy processes, you can see this on the Wahlprüfsteinen ( http://blog.wikimedia.de/2010/05/05/wahlpruefsteine-landtagswahl-nordrhein-westfalen-2010/ ) and so on. The old surveillance website (http://osm.vdska.de/?zoom=14&lat=52.40252&lon=9.7162&layers=B0TFF dangerous!) works with vector layer and kills my browser very often. Now we have an working solution and should use it in other situations if we can't provide a better way. The smoking layer is also IMO a use-case where OSM can show that it can more than other systems. I see only two problems: *I think the maps on toolserver should be political neutral. (green, yellow, red is it not.) *The surveillance layer is relative stable. To compare the smoking layer will have a rapid change at beginning. So I have no idea to run efficient tile caching or so. Greetings Kolossos _______________________________________________ Maps-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/maps-l
