[GRASS5] Voxels/3D rasters in GRASS 6.1

[benducke at compuserve.de]

Thanks, Markus for all the info. This should point
me into the right direction to get a grip on my
troubles.
I will try again and document my experiences
when I get back from my holidays.

Cheers,

Benjamin

----- Originalnachricht -----
Von: Markus Neteler <neteler at itc.it>
Datum: Freitag, 1. Juli 2005 5:38 pm
Betreff: Re: [GRASS5] Voxels/3D rasters in GRASS 6.1

> On Fri, Jul 01, 2005 at 11:50:57AM +0200, benducke at compuserve.de 
> wrote:> This is another mail in my desperate quest for handling 3D 
> data> in GRASS. I am trying voxels this time and got stuck just as
> > quickly as with 3D vectors.
> > Maybe someone could answer some of the questions I have.
> > I am using GRASS 6.1 CVS (about 2 weeks old).
> > 
> > 1. Do all commands that relate to voxels have r3. prefix now? Which
> > other commands relate to voxels?
> 
> Yes: r3.*
> - plus v.vol.*
> - plus g.* for file/region management (was g3.* in earlier days)
> 
> 
> > 2. r3.in.ascii mentions s.to.rast3 is there an equivalent 
> command for
> >    this in 6.1?
> 
> No. I think that s.to.rast3 still needs to be ported as v.to.rast3.
> 
> 
> > 3. When trying to visualise a voxel in nviz, I get:
> > 
> >   Illegal filename. character <> not allowed.G__open(r): mapset 
> (benni)> doesn't    match xmapset (ô¯@DHäÿ¿|v at 5&òr@ÿÿÿÿ@äÿ)
> > 
> >   on the console. Am I using a broken version of nviz?
> 
> Doesn't look good. I used the Slovakia data set a few days
> ago without problems.
> 
> > 4. Why does r3.info not give information about the data range?
> 
> AFAIK: No, that's a TODO.
> 
> > 5. How do I get actual volume information, do I have to count the
> >    non NULL cells in the voxel map, then add them up? Is there
> >    any command that can give me 3D raster voxel statistics?
> 
> There is not too much yet, I believe.
> 
> > 6. Is there any CURRENT information about voxels and GRASS on the
> >    web?
> 
> Should be. Please help to improve the documentation...
> 
> > I would be very happy indeed about any information on this subject!
> > 
> > Cheers,
> > 
> > Benjamin
> 
> Markus
> 
>