Re: geocouch: limit number of points in an area

[Volker Mische]

On 01.08.2010 17:24, Benoit Chesneau wrote:
On Sun, Aug 1, 2010 at 2:17 PM, Volker Mische<volker.mis...@gmail.com>  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.

Cheers,
  Volker