[udig-devel] intersection/disjunction of layers?

[Jesse Eichar]

I've been working on something for this sort of issue.  But it is not  
ready in uDig yet.  It will be based on a Geotools construct which  
allows a layer to be constructed from an Arbitrary SQL statement.   
Perhaps you can look into that.  Jody should hopefully know more.

Jesse

On 12-Dec-07, at 3:26 AM, Vince Darley wrote:

> I have several layers related to a road network.  Each is composed  
> of LineStrings or similar.  These layers are all different views/ 
> subsets of an underlying postgres table of road segments -- all  
> referenced by a primary "road segment id" key.
>
> I'm wondering if uDig (or any community plugins) provide an easy way  
> to see, for any pair of such layers, which road segments are shared  
> by the two layers and which are not shared - i.e. intersection and  
> disjunction of the sets of road segments.
>
> Any known capabilities which cover this?
>
> regards,
>
> Vince.
>
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
> http://lists.refractions.net/mailman/listinfo/udig-devel