[GRASS-user] Divide raster map using vector line

[Helmut Kudrnovsky]

Rich Shepard wrote
> Running 7.3.svn here on Slackware-14.1/-14.2 and looking at both vector
> and raster modules I don't see how to overlay a vector map on a raster map
> to divide the raster into two sections.
> 
>    The raster map has the same value in every cell. I want to change the
> value in cells north of a vector map of a road. If there's a workflow
> description in the docs please point me to it. Otherwise, please suggest a
> procedure to accomplish this.
> 
> TIA,
> 
> Rich
> 
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What about?:

-g.region by your raster 
-v.in.region to get a vector area of your raster 
-split the vector area by your road
-Add a new attribute column and give 1 for the area which shouldn't change
and the other the number which you want to divide 
-v.to.rast by attribute 
-r.mapcalc with some if statement 





-----
best regards
Helmut
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