[postgis-users] How to extract common linestring of polyon and linestring

akrherz at iastate.edu akrherz at iastate.edu
Thu Mar 12 06:11:15 PDT 2009

On Wed, 11 Mar 2009, Stephen Woodbridge wrote:

> You might try something like:
> How about buffering the country polygon by your tolerance and then get 
> the results of the buffered country and the river.

Thanks so much, that got me pointed in the right direction.  What I 
settled on doing is:


So I turn the county polygon into an exteriorRing and then buffer it out a 
bit.  Then see what portions of the river intersect that buffered polygon.


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