[OpenLayers-Users] GeoJSON tiles

[Jack Greenbaum]

UTFGrid seems like a good way to add interaction if your features are 
rendered to tiles on the server. With what I did the features get 
rendered by the client, and styled by the client. An advantage I see to 
using client rendered features vs UTFGrid for hit detection is that the 
client rendered OpenLayers.Features can change color when moused over or 
selected, where UTFGrid depends on a static rendering provided by the 
server, unless I've missed something. Otherwise the tradeoffs seems to 
be typical server-vs-client rendering things.

Thanks for the pointer.

-- Jack

On 02/18/14 08:17, Greg Allensworth wrote:
> You may be interested in UTFGrid:
> http://dev.openlayers.org/releases/OpenLayers-2.13.1/examples/utfgrid.html
>
>
> This is one technique for fetching server-side "tiles" of vector
> information linked to geographic location, then adding mouse events
> such as hovers.
>
> UTFgrid-compatible output can be generated from TileStache. I'm not
> sure what other server-side map servers will generate
> UTFgrid-compatible "JSON tiles" -- as far as I know MapServer and
> TileCache won't.
>
> -g
>
>
>
> On 2/16/2014 4:30 PM, Jack Greenbaum wrote:
>> I'm building a viewer for a GIS database with a large number of points.
>> In thinking about how render the features so they are selectable in a
>> scalable way, it seemed that using GeoJSON tiles with decluttering per
>> tile might be a way to go, just like map tiles. I didn't see a way to
>> display tiled GeoJSON in OL2, so I put together a new OpenLayer.Tile
>> class to be used with an OpenLayer.Layer.XYZ layer to manage marshaling
>> features on and off a Vector layer as the map scrolls and zoom. It is a
>> pretty simple hack. You can see an example at
>> http://www.greenbaum.org/openlayers/examples/geojson-feature-popup.html.
>> The code is on github, here is the commit,
>> https://github.com/jgreenbaum/openlayers/commit/5de4a17049ca48f46b69c645111a3c5e5bfb4f4d.
>>
>>
>>
>> Did I miss something, was there already a way to display tiled GeoJSON
>> like this? If I didn't miss something, is this useful code?
>>
>> -- Jack
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>
>