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From Benoit Chesneau <bchesn...@gmail.com>
Subject Fwd: geocouch: limit number of points in an area
Date Mon, 02 Aug 2010 08:55:14 GMT
I blame gmail. This mail was  for all


---------- Forwarded message ----------
From: Benoit Chesneau <bchesneau@gmail.com>
Date: Mon, Aug 2, 2010 at 8:30 AM
Subject: Re: geocouch: limit number of points in an area
To: Volker Mische <volker.mische@gmail.com>


On Sun, Aug 1, 2010 at 10:43 PM, Volker Mische <volker.mische@gmail.com> 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.
>
> Cheers,
>  Volker
>
>
>

Just for the record since we discuss about it on irc, but my main
point here is to have it working in a couchapp.

So imo, if CouchDB could embed all the mechanic to index geodata, but
also search them it would be better than accumulating external tool on
top of it.

- benoit

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