[OpenLayers-Dev] Fwd: Grid-style loading of Markers

[Evan James Bowling]

---------- Forwarded message ----------
From: Evan James Bowling <evan.bowling at gmail.com>
Date: Tue, Feb 9, 2010 at 3:52 PM
Subject: Re: [OpenLayers-Dev] Grid-style loading of Markers
To: Matt Williamson <MatthewDW at gmail.com>


 What do you think about just limiting which points get loaded? This would
still need a bit of a server component but it wouldn't be anything as big as
Geoserver.

 There are also ways to cluster a large set of data
points<http://dev.openlayers.org/docs/files/OpenLayers/Strategy/Cluster-js.html>such
that only a manageable amount would be displayed. I have messed with
this functionality much myself, but I intend to give it a shot soon.

Unless you are willing to restrict the zoom interface to only a few levels
it seems like generating that amount of tiles would be more work than its
worth ( just my opinion).

Hope some of this helps.

Evan Bowling


On Tue, Feb 9, 2010 at 2:38 PM, Matt Williamson <MatthewDW at gmail.com> wrote:

> Devs,
>
> I posted this to the Users list, but the devs list might have made more
> sense, since part of the question has to do with the vector behaviors
> sandbox in SVN...
>
> I am looking for a way to load statically stored "tiles" full of marker
> information, so I can do progressive disclosure of a large point dataset
> (and I don't have access to Geoserver or similar server-side component). My
> maps are spherical mercator/Google based, so loading the markers in tiles
> makes sense.
>
> I found this post on the dev list, which sounds pretty much exactly like
> what I want to do...
>
> http://openlayers.org/pipermail/dev/2009-January/004222.html
>
> But it was using stuff from the vector behaviors sandbox, which hasn't been
> touched in a year, it looks like.
>
> So my question is: Is there a standard way to do something like this? From
> static tile files on the server filesystem (probably GeoJSON format)? I know
> the "right" answer is to set up a WFS server somewhere, but that's out of
> the question in the short term. Plus, my point locations change very seldom,
> so Geoserver would really be overkill anyway.
>
> I was going to try writing my own OpenLayers.Layer.Grid and OpenLayers.Tile
> subclasses, but I wanted to check if there's an existing way to do this that
> I've missed, or if the OpenLayers.Strategy.Grid stuff in the vector
> behaviors sandbox stuff is still a valid way to go.
>
> Thanks!
>
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>
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