[GRASSLIST:8641] v.to.rast with line layers

GRASS GRASS user
1

Hi all!

I can't seem to find the way to rasterize a simple roads (line) vector layer. I
tried with points and areas and both worked, but lines did not. A peculiar
thing is that if I try to digitize a line vector and rasterize it, it works,
but with the "roads" vector layer I always get a blank raster. I did:

psql posts
posts=# \d roads
               Tabela "public.roads"
  Stolpec | Tip | Modifikatorji
------------+-----------------------+---------------
cat | integer |
length | double precision |
cod | double precision |
gavprimary | double precision |
geometry_s | character varying(15) |
link_name | character varying(30) |
id1 | double precision |
type | character varying(50) |
limits | integer |
Indeksi:
    "roads_cat" unikaten, btree (cat)
psql=# \q
GRASS 6.1.cvs (master):~ > v.to.rast in=roads out=roads use=attr col=limits

I also tried:
v.to.rast in=roads out=roads use=cat
v.to.rast in=roads out=roads use=val val=1
without success.

I even tried to copy the vector and export it in ascii and reimport it with the
same result.

I have maybe a month old cvs.

Suggestions are welcome.
Miha Staut

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2

I can't seem to find the way to rasterize a simple roads (line) vector
layer. I tried with points and areas and both worked, but lines did
not. A peculiar thing is that if I try to digitize a line vector and
rasterize it, it works, but with the "roads" vector layer I always get
a blank raster.

perhaps this is it:

only features with a category number will be converted. Use v.category.

make sure region is correct.

?
Hamish