[GRASS-user] 3D geological volume modeling (raster 3D): is it really possible ?

[Michael Barton]

It is indeed possible. The 2 important issues are the way you construct the voxels and the way you visualize them.

If you want to have solid layers with sharp upper and lower boundaries (e.g., geologic strata), use r.to.rast3 or r.to.rast3elev. If you want to represent a property that varies continuously vertically (e.g., soil OM or groundwater), you need to create 3D points and do a 3D interpolation. 

Once you have a volume, it just looks like a block unless you specify colors and visualize it in NVIZ with isosurfaces and/or slices. However, even if it "looks" like a block, you can still query it as a 3D volume to extract a geologic layer, for example based on its z coordinate or voxel value.

Michael



On Jun 9, 2012, at 6:04 AM, <grass-user-request at lists.osgeo.org>
 wrote:

> For example:
> from <plangeol.jpg>to <volumo.jpg>
> 
> 
> Is this really possible ?  (it needs lots and lots of memory)
> 
> Many thanks 
> 
> 

_____________________
C. Michael Barton
Visiting Scientist, Integrated Science Program
National Center for Atmospheric Research &
University Consortium for Atmospheric Research
303-497-2889 (voice)

Director, Center for Social Dynamics & Complexity 
Professor of Anthropology, School of Human Evolution & Social Change
Arizona State University
www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu





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