> 
> I have been attempting to convert a
> vector area layer to a raster layer using
> v.to.rast.  The problem I am having is
> that the vector layer contains a polygon
> that is wholly encloses by another
> polygon.  When executing a d.what.vect,
> the proper attribute value is returned
> for this lake.  However, after the
> conversion, the raster layer has "no
> data" for the lake.  Is this a known
> problem with v.to.rast?  I have checked
> for overlapping areas and there are none.
> I was able to circumvent the problem by
> importing the lake separately and doing
> an r.patch.  This seems like a roundabout
> way of doing it.  Any comments would be
> appreciated.
> 
> John Sparco
> 
> 

I didn't know this either, but Olga just wrote me that in order to do
anything after v.digit you'd better build your topology with v.support.
Apparently v.digit (although it always gives the message 'writing dig_plus
file') doesn't automatically update everything in your dig-files. I
suppose things like this could be more specific in the manuals.

Philip Verhagen


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