Re: [Geoserver-users] WMS query tolerance

[Chris H. <ch...@op...>]

On Tue, 22 Feb 2005, John Xiao wrote:

> Is there a way that I can set query tolerance so I can use WMS query to
> search for a point, a line or a small polygon on the map?
Not quite sure what you mean.  You mean to do a GetFeatureInfo request?  
Or you want it to just return certain features that meet set criteria?  
For both you may look into the WFS GetFeature requests.  It returns GML, 
which you can then render yourself, but it allows you much finer control 
over your requests.  With WMS you can really only find a bounding box - 
with WFS you can search against a number of Filters - both spatial and 
non-spatial.  

If you need WMS then GeoServer actually has some hacked in ability to 
append a Filter to a WMS request.  The recommended OGC way to get Filters 
into a WMS is to use an SLD document that specifies the Filter as part of 
the rule.  GeoServer is not a full SLD-WMS yet, so you can't include SLD 
in the request, but you can upload it and make it a named style.

Chris


>  
> Thanks,
>  
> John Xiao
> 

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