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From J Chris Anderson <jch...@apache.org>
Subject Re: geocouch: limit number of points in an area
Date Sun, 01 Aug 2010 20:48:11 GMT

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<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.
> 

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
> 
> 


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