On 01.08.2010 22:48, J Chris Anderson wrote:
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.
The problem is, that the points are potentially returned in random
order. So you never know if there will be a point that is close to
anther one at a later stage.
Cheers,
Volker
