On 27/01/14 11:27, Johannes Radinger wrote:
Hi,
I have a raster river (processed with r.thin) which I want to transfrom
to a vector.
Therefore I use r.to.vect with the lines option. However, the raster has
two different
values representing e.g. habitat quality (good/bad) for single segments
(group of raster cells). This information is written strangely to the
vector attribute table as the lines
are not broken at changes of habitat quality which is a reasonable
behaviour of r.to.vect.
As I need the attributes in my vector table I thought about splitting
the vector into
small segments (<raster resolution) and updating the attribute table
with v.what.rast. However when I use v.split the attribute table of the
created map still has the same number of entries than before. So what do
I miss here to get single rows and thus categories for the single
created lines from v.split?
Or is there any other/better way for such transformation of raster lines
to vector lines incl. an update of the attribute table?
I'm not sure I totally understand your problem (an example with the NC
data would probably help), but have you tried the '-v' flag (Use raster
values as categories instead of unique sequence) of r.to.vect ?
Moritz
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