[GRASS-user] azimuth of lines with v.to.db?

[Carlos "Guâno" Grohmann]

This is almost what I need. I need the results to be in range 0-360,
from North. So I can get a rose diagram, with petals weighted
according to azimuth frequency or to azimuth lenght, like the
attachment.

cheers

Carlos



On 10/14/07, Dylan Beaudette <dylan.beaudette at gmail.com> wrote:
> On Saturday 13 October 2007, Carlos "Guâno" Grohmann wrote:
> > I think I already asked this, but without much success, so here is:
> > can I use v.to.db to get the azimuth of a line? I am thinking in
> > lineament analysis, so it's a simple line, just two end vertices.
> >
> > thanks
> >
> > Carlos
>
>
> Can you calculate it from the end points ?
>
> Like this:
>
> http://casoilresource.lawr.ucdavis.edu/drupal/node/468
>
>
> .... except that the calculation I am doing is in R. atan2() should exist in
> the c library, so adding it to GRASS should be a small effort.
>
>
> Dylan
>
> --
> Dylan Beaudette
> Soil Resource Laboratory
> http://casoilresource.lawr.ucdavis.edu/
> University of California at Davis
> 530.754.7341
>


-- 
+-----------------------------------------------------------+
              Carlos Henrique Grohmann - Guano
  Visiting Researcher at Kingston University London - UK
  Geologist M.Sc  - Doctorate Student at IGc-USP - Brazil
Linux User #89721  - carlos dot grohmann at gmail dot com
+-----------------------------------------------------------+
_________________
"Good morning, doctors. I have taken the liberty of removing Windows
95 from my hard drive."
--The winning entry in a "What were HAL's first words" contest judged
by 2001: A SPACE ODYSSEY creator Arthur C. Clarke

Can't stop the signal.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: rose.jpg
Type: image/jpeg
Size: 58355 bytes
Desc: not available
Url : http://lists.osgeo.org/pipermail/grass-user/attachments/20071014/62ab0fb9/rose.jpg