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From Volker Mische <volker.mis...@gmail.com>
Subject Re: geocouch: limit number of points in an area
Date Sun, 01 Aug 2010 20:43:26 GMT
On 01.08.2010 17:24, Benoit Chesneau wrote:
> On Sun, Aug 1, 2010 at 2:17 PM, Volker Mische<volker.mische@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



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