On Aug 1, 2010, at 1:43 PM, Volker Mische wrote: > On 01.08.2010 17:24, Benoit Chesneau wrote: >> On Sun, Aug 1, 2010 at 2:17 PM, Volker Mische<[email protected]> >> wrote: >>> On 01.08.2010 10:53, Benoit Chesneau wrote: >>>> >>>> I'm looking for a way to limit number of points retrieved for an area >>>> depending on its size. Ie When playing with the zoom on the map I want >>>> to be able to only display and retrieved only main points instead of >>>> all the points in this area. Is there a simple way to do that actually >>>> ? >>>> >>>> - benoit >>> >>> Hi Benoit, >>> >>> there a two ways. Either introducing a "limit" parameter, but that's >>> probably not what you want. It would limit to a arbitrary selection (not the >>> "main points" as you'd like to have it). >>> You probably want clusters. My suggestion is to do it on the client side >>> with OpenLayers' cluster strategy [1][2]. >>> >>> [1] http://openlayers.org/dev/examples/strategy-cluster.html >>> [2] http://openlayers.org/dev/examples/strategy-cluster-threshold.html >>> >>> Cheers, >>> Volker >>> >> This solution doesn't work when you have a lot of points though. Do >> you plan to add such things to geocouch ? >> > > Clustering isn't that easy. I think some layer on top of GeoCouch should/will > be built to handle such things. It can even be in any programming language > and communicate with GeoCouch via HTTP. >
If there is a threshold that can be emitted with the points, maybe a _list function is the way to filter it server side. > Cheers, > Volker > >
