[GRASS-user] [GRASSLIST:1108] Re: tin to raster dem

[ivan marchesini]

Hi Laurent, thanks for your answer....
I know that v.surf.* is able to interpolate points and contours...
but don't have this kind of data and I don't mind to interpolate points
because I would like to obtain perfect planes in correspondace of the
triangles!!! interpolating will obviously create some little difference
between the elevation of the dem and of the original triangle surface...
the boundaries that I have are 3d boundaries, they start from an
elevation and finish to another...
if you can imagine a 3d triangle you can also imagine a raster dem the
cells of which has the same elevation of the plane in each point!!!

I have tried to interpolate the tree points of a 3d triangle...
using v.surf.rst and smoothing=0 and tension=1  (for creating a perfect
plane) but the results is not so fine (please see the small attached
file, I apologize for this image with the users of the mailing list)

I know I can use r.plane for creating a single plane but I should know
the azimut and deep of the plane... is there a way to obtain this
information for a 3d triangle??? (not in a manual way obviously)

any idea????
thanks 

Ivan







Il giorno ven, 16/06/2006 alle 10.55 +0200, Laurent C. ha scritto:
> Hi,
> You can try v.surf.*
> 
> 2006/6/16, ivan marchesini <marchesini at unipg.it>:
>         Dear all...
>         I have been able to create a tin starting from the v.delaunay
>         module and
>         then manual editing the v.delaunay output exported with
>         v.in.ascii
>         (format=standard)
>         now I can see, using nviz, the some filled triangles in the
>         3d 
>         space...!!!!
>         now the problem:
>         I would like to transfrom the tin surface in a raster
>         surface...
>         is it possible in some way!!!!
>         any idea????
>         
>         
>         
>         
>         
>         
>         --
>         Ivan Marchesini
>         Department of Civil and Environmental Engineering 
>         University of Perugia
>         Via G. Duranti 93/a
>         06125
>         Perugia (Italy)
>         e-mail: marchesini at unipg.it
>                 ivan.marchesini at gmail.com
>         tel: +39(0)755853760
>         fax: +39(0)755853756
>         jabber: geoivan73 at jabber.org
>         
>         
> 
-- 
Ivan Marchesini
Department of Civil and Environmental Engineering
University of Perugia
Via G. Duranti 93/a 
06125
Perugia (Italy)
e-mail: marchesini at unipg.it
        ivan.marchesini at gmail.com
tel: +39(0)755853760
fax: +39(0)755853756
jabber: geoivan73 at jabber.org

-------------- next part --------------
A non-text attachment was scrubbed...
Name: wrong_solution.jpg
Type: image/jpeg
Size: 8064 bytes
Desc: not available
Url : http://lists.osgeo.org/pipermail/grass-user/attachments/20060616/03653c52/wrong_solution.jpg