[Geojson] Adding extra data to a geojson string

[Tim Schaub]

Hey-

Chitraleka Appalanaidu wrote:
> Hi all,
> 
> I have a geojson file that I pass to the penLayers.Format.GeoJSON 
> parser. This parser converts the a geojson string (as below) to a 
> OpenLayers.Vector.Feature object and adds it into an OpenLayers Vector 
> layer (that performs clustering)
> 
> {
>     "type": "FeatureCollection",
>     "features": [
>         {"type":"Feature", "id":"1", "properties":{}, 
> "geometry":{"type":"Point", "coordinates":[143, -35.91]}},
>         {"type":"Feature", "id":"2", "properties":{}, 
> "geometry":{"type":"Point", "coordinates":[144, -37.81667]}}
>     ]
> }
> 
> 
> The problem with adding it into a clustering layer is that any 
> properties I add into the "properties":{} field in the above geojson 
> file will get overriden (because clustering will cause a count value to 
> be entered into the properties list).
> 
> I would like to add other information about a point in the geojson file 
> above. Is there any other key-value pair i can use to do this? I have 
> tried the 'fid' and 'style' key-value pairs but the parser does not seem 
> to parse them out into a OpenLayers.Vector.Feature object.
> 

In terms of what you can do in GeoJSON, any other members (with 
non-reserved names) are allowed on feature objects.

I think your issue is exclusively an OpenLayers issue.  OpenLayers will 
parse whatever you put in the properties member and make this available 
at feature.attributes (as you've seen).  When you use the cluster 
strategy, you can get at the original features in the cluster via 
feature.cluster.

If you haven't already, you could write an email to the OpenLayers dev 
list with more specific questions.

Tim

> Thank you.
> 
> Kind regards,
> Chitra
> 
> 
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-- 
Tim Schaub
OpenGeo - http://opengeo.org
Expert service straight from the developers.