[GRASS-user] v.to.rast "Converted points/lines: 0 of 47763"

GRASS GRASS user
1

Hi,

today another question.

My problem:
I converted boundaries from an area vmap to lines via v.type
v.type input=gitter@achim output=gitter_lines type=boundary,line --o

Now I want to convert these lines to raster-cells via:

v.to.rast --overwrite input=gitter_lines@achim output=gitter_lines
use=cat type=line

but nothing converts!

Loading data...
Pass 1 of 2:
Reading features...
Schreibe Rasterkarte...
Pass 2 of 2:
Schreibe Rasterkarte...
Converted areas: 0 of 0
Converted points/lines: 0 of 47763
v.to.rast komplett.

What am I doing wrong?

thanks,
achim

2

achim wrote:

today another question.

My problem:
I converted boundaries from an area vmap to lines via
v.type
v.type input=gitter@achim output=gitter_lines
type=boundary,line --o

Now I want to convert these lines to raster-cells via:

v.to.rast --overwrite input=gitter_lines@achim
output=gitter_lines
use=cat type=line

but nothing converts!

Loading data...
Pass 1 of 2:
Reading features...
Schreibe Rasterkarte...
Pass 2 of 2:
Schreibe Rasterkarte...
Converted areas: 0 of 0
Converted points/lines: 0 of 47763
v.to.rast komplett.

What am I doing wrong?

boundaries typically do not have a category value (e.g. a boundary between
two fields: which farmer owns the boundary?), but sometimes can (e.g. if
boundary is also a road)

only items with category are processed by most vector modules (they loop
from the first cat to the last cat). So run v.category to add cats to
your lines and then it should work.

there is a (short) word about this in the vectorintro help file.

Hamish

3

Thanks Hamish,

but I do have cats. I did v.clean and I tried with v.category, too. But
it doesn't help.

Maybe my cats addressing the nodes???

achim

Hamish schrieb:

achim wrote:

today another question.

My problem:
I converted boundaries from an area vmap to lines via
v.type
v.type input=gitter@achim output=gitter_lines
type=boundary,line --o

Now I want to convert these lines to raster-cells via:

v.to.rast --overwrite input=gitter_lines@achim
output=gitter_lines
use=cat type=line

but nothing converts!

Loading data...
Pass 1 of 2:
Reading features...
Schreibe Rasterkarte...
Pass 2 of 2:
Schreibe Rasterkarte...
Converted areas: 0 of 0
Converted points/lines: 0 of 47763
v.to.rast komplett.

What am I doing wrong?

boundaries typically do not have a category value (e.g. a boundary between
two fields: which farmer owns the boundary?), but sometimes can (e.g. if
boundary is also a road)

only items with category are processed by most vector modules (they loop
from the first cat to the last cat). So run v.category to add cats to
your lines and then it should work.

there is a (short) word about this in the vectorintro help file.

Hamish

4

Hi all,

I solved by adding cat via v.category (only) for the lines. Before only
centroids cats where present by default.

v.clean not nesessary.

Thanks Hamish!
achim

achim schrieb:

Thanks Hamish,

but I do have cats. I did v.clean and I tried with v.category, too. But
it doesn't help.

Maybe my cats addressing the nodes???

achim

Hamish schrieb:

achim wrote:

today another question.

My problem:
I converted boundaries from an area vmap to lines via
v.type
v.type input=gitter@achim output=gitter_lines
type=boundary,line --o

Now I want to convert these lines to raster-cells via:

v.to.rast --overwrite input=gitter_lines@achim
output=gitter_lines
use=cat type=line

but nothing converts!

Loading data...
Pass 1 of 2:
Reading features...
Schreibe Rasterkarte...
Pass 2 of 2:
Schreibe Rasterkarte...
Converted areas: 0 of 0
Converted points/lines: 0 of 47763
v.to.rast komplett.

What am I doing wrong?

boundaries typically do not have a category value (e.g. a boundary between
two fields: which farmer owns the boundary?), but sometimes can (e.g. if
boundary is also a road)

only items with category are processed by most vector modules (they loop
from the first cat to the last cat). So run v.category to add cats to
your lines and then it should work.

there is a (short) word about this in the vectorintro help file.

Hamish

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