[GRASS-user] gettşing closed boundary line

GRASS GRASS user
1

hello

how can I get perimeter line of an area ( as closed boundary line) ?

regards

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Ahmet Temiz

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2

temiz wrote:

how can I get perimeter line of an area ( as closed boundary line) ?

v.to.db

Maciek

3

Maciej Sieczka wrote:

temiz wrote:

how can I get perimeter line of an area ( as closed boundary line) ?
    
v.to.db

Maciek

thank you for your interest

If I am not mistaken, v.to.db produces perimeter as value.
I need only border "line" of an area (as graphic).

I am going to use it as GMT mask.

regards

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Ahmet Temiz

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4

1) v.category to add a category number to the boundary
2) v.extract to extract just the boundary

You can found more info on this commands, here:
http://grass.itc.it/grass62/manuals/html62_user/vector.html

Hope this help

Luca

On Fri, 19 Jan 2007 09:41:36 -0500
temiz <temiz@deprem.gov.tr> wrote:

Maciej Sieczka wrote:
> temiz wrote:
>
>
>> how can I get perimeter line of an area ( as closed boundary line) ?
>>
>
> v.to.db
>
> Maciek
>
>
thank you for your interest

If I am not mistaken, v.to.db produces perimeter as value.
I need only border "line" of an area (as graphic).

I am going to use it as GMT mask.

regards

--
Ahmet Temiz

--
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GENTOO-GIS Development Team
jabber: casagrande@jabber.linux.it

5

temiz wrote:

Maciej Sieczka wrote:

temiz wrote:

how can I get perimeter line of an area ( as closed boundary line) ?

v.to.db
  

thank you for your interest

If I am not mistaken, v.to.db produces perimeter as value.

Yes. You asked for perimeter. The perimeter is the distance around a
two-dimensional object. Hence, it has to be a "value".

I need only border "line" of an area (as graphic).

OK. So you want to extract a boundary. Then add category (v.category)
to your boundary and extract it (v.extract).

Maciek

6

temiz wrote:

Maciej Sieczka wrote:
> temiz wrote:
>> how can I get perimeter line of an area (as closed boundary line)?

Maciek:

> v.to.db

thank you for your interest

If I am not mistaken, v.to.db produces perimeter as value.
I need only border "line" of an area (as graphic).

I am going to use it as GMT mask.

[Luca/Maciek answered: v.category + v.extract]

see also v.hull and v.in.region.

Hamish