[GRASS-user] Change detection in a Vector (polyline) dataset

[Maris Nartiss]

Just an idea:
v.surf.rst/idw/etc for both datasets
r.mapcalc diff=old-new
cell area*diff sum


Maris.

2008/3/19, Andrew Schroeder <andrew_schroeder at charoneconcepts.com>:
> Hi Everyone,
>
>  Can you tell me if GRASS is able to detect change between two input
>  polyline shapefiles?  I have a 5m contour set for two different years at
>  a particular mine, and I'm looking for a way to automate detection of
>  the yearly pit advances.
>
>  Basically, I'm looking for something to subtract file A from file B
>  (b-a=change) and output a file showing just the lines that changed
>  between the two files.
>
>  Thanks for any direction you can offer.
>
>
>  Andrew Schroeder
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