ODP: [GRASS-user] voxel from dems

[Maciej Tomaszczyk]

hi
thanks Soren for your sugestions i will try r.to.rast3 
best
maciej

Maciej Tomaszczyk
Polish Geological Institute
Geological Mapping Department



-----Wiadomość oryginalna-----
Od: Soeren Gebbert [mailto:soerengebbert at gmx.de]
Wysłano: Śr 2006-07-26 00:47
Do: grassuser at grass.itc.it
DW: Maciej Tomaszczyk
Temat: Re: [GRASS-user] voxel from dems
 
Dear Maciej,

On Tuesday 25 July 2006 21:47, Maciej Tomaszczyk wrote:
> hello all
> 
> i try to make a grid3d geological model from a drillhole data
> first i generated a couple of dems which represent a geological bounduary,
> (using Z values of geological bounduary from drillholes), 
> after that i used r3.out.vtk and everythink looked ok in paraview, but 
> i got a big problem with some geological structures wich are not more less planar
> as salt diapir or overturned folds, its mean that in some drillhole profills more 
> than one Z value exist (which represent the same bounduary)  
> and i am not able to make a DEM using both Z values.

>There is no way to create such volume surfaces with r3.out.vtk + dems,
>because of the limits of dems to have only one Z value per cell.

>But there are maybe some other ways:

>One way would be to modell the geological structures as 3d faces in
>grass and export this with v.out.vtk. But this is very .... hard.

>The second way would be to modell the geological structures as raster
>map slices at a specific hight and put them together with r.to.rast3. 
>take a look at:
>http://www-pool.math.tu-berlin.de/~soeren/grass/modules/screenshots/r.to.rast3.png

>Now you can export this data with r3.out.vtk and use the threshold or isosurface 
>filter of Paraview to extract the geological structure. To use these Filter you will need
>VTK point data (export with r3.otu.vtk or the Cell-Data-To-Point-Data filter of Paraview).

>For now there is no way to import the generated VTK isosufaces into grass. 
>And it would be nice if GRASS would have such a threshold or isosurface modules like VTK. 
>But this is just a wish... . 
>Well .... i have some ideas in my mind how to implement this. ;)

>Best regards
>Soeren

> maybe some of you got the same problem
> can you help me solve it
> best
> maciej  
> 
> Maciej Tomaszczyk
> Polish Geological Institute
> Geological Mapping Department
> 
> 

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