[GRASS-user] Re: intersection of vectors not working (fixed but some issued remain)

[Carlos "Guâno" Grohmann]

So, I managed to get the intersections of contours with drainages. But
not the way I wanted at first. If I just derive the contours and
drainage, I don't get the intersections. If I export them as
shapefiles and import again, then I get intersections...


Carlos



On 7/23/06, Carlos Guâno Grohmann <carlos.grohmann at gmail.com> wrote:
> Hi all.
> I'm trying get the intersections of contours and drainage, bu v.clean
> insn't giving me any output.
> The contours are from r.contour.
> Drainages came from JGrass (I need Strahler order), I used r.mapcalc
> to get a raster only with the orders of interest, then r.thin, then
> r.to.vect.
> After that I patched the vectors, with v.patch and used v.clean to get
> the intersections, as:
>
> v.clean input=patch output=temporary err=intersect tool=break
>
> but then...
>
> GRASS_INFO_MESSAGE(10017,11): Tool: Break lines at intersections
> Intersections:     0
> Intersections:     0 (line 329)
> Intersections:     0 (line 683)
> Intersections:     0
>
> I don't understand. Did I miss something on generating contours or
> converting drainage to vector? I used v.build on both maps prior to
> v.patch.
>
> thanks
>
> Carlos
>
>
>
> --
> +-----------------------------------------------------------+
>               Carlos Henrique Grohmann - Guano
>   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
>


-- 
+-----------------------------------------------------------+
              Carlos Henrique Grohmann - Guano
  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