[GRASS-user] [GRASSLIST:1110] Re: tin to raster dem

[ivan marchesini]

Hi Laurent,
not useful!!
there's not the option (using v.to.rast) for converting a 3d area into a
raster   :-( 


Il giorno ven, 16/06/2006 alle 15.39 +0200, Laurent C. ha scritto:
> 2006/6/16, ivan marchesini <marchesini at unipg.it>:
>         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????
> 
> I see. What sort of result give v.to.rast ?
-- 
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