[email protected] wrote:
Greetings,
Firstly, PostGIS continues to rock! Thanks so much for this software...
My question is that I have a rivers linestring table and a political
boundaries table (US counties) polygon. I am wishing to extract the
portion of the river geometry that lies along a county border. Of
course, these two layers don't have the same individual point precision,
so I suspect some buffering, simplification is necessary. I am not
seeking anything exact, but something like if the river and a county
border are within a few hundred meters of each other for some distance
along the river and county border.
I can't seem to figure out which functions could accomplish this task,
or if it is possible. Currently, I have no issue finding points of
intersection, so perhaps that is part of the solution that is staring me
in the face :)
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.
-Steve
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