[OpenLayers-Users] doing a search with a buffer

[Roald de Wit]

Hi,

What you want is more difficult than I realised. If you can retrieve the 
geometry of the feature you are interested in, you could use that in 
your filter (instead of the point). Have a look at the getfeature-wfs 
example on how to do that [1]. If you cannot retrieve your geometry it's 
going to be harder.

I don't know if you can tell your WFS server to use the geometry of a 
certain feature for your spatial operator (like: give me all features 
from layer X within a buffer around this feature from layer Y (or are 
all features in the same layer?)). Maybe somebody else can shed a light 
on whether this is possible? I'm sure you could do it with a WPS server, 
but that adds extra complexity.

Regards, Roald

[1] http://www.openlayers.org/dev/examples/getfeature-wfs.html


On 12/05/10 05:10, sunny74 wrote:
> Hi Roald,
>
> Thanks for your reply.
> If I have the center point of the selected region then your code will do the
> rest.
> But the problem is that when the box is drawn using the GEtFeature control
> it is not possible to get center point of the selected region or the bounds
> of the selected region.
> If either of these were available then it would have been possible to draw a
> layer over the selected region.(this is wrt 'drawing a polygon over selected
> region').
>
> w .r.t this post I have a structure ID using which I can get the geometry
> from the postgres table.Since I get this geometry on the server side I need
> to get the other geometries and their attributes on the server side as well.
>
> I am not sure how get feature can help me when my selected geometry is on
> the server side.
> As far as I know getfeature works only when I select multiple features on a
> wfs layer.
> Is it possible to pass the geometry to getfeature control and get other
> feature details within a certain radius.
>
> Thanks.
>