1raster3dintro(1)              Grass User's Manual             raster3dintro(1)
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3D Raster data (voxel) in GRASS GIS

6   3D Raster (voxel) import
7       The  module  r3.in.ascii  supports generic x,y,z import. Alternatively,
8       voxels can be generated from 3D point vector data (v.to.rast3).  Always
9       the full map is imported.  Volumes can also be created based on 2D ele‐
10       vation map(s) and value raster map(s) (r.to.rast3elev).  Alternatively,
11       a  volume  can  be  composed  of several 2D raster map slices which are
12       merged into one 3D raster volume map (r.to.rast3).
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14   Voxel region settings and 3D MASK
15       GRASS 3D raster map processing is always performed in  the  current  3D
16       region  settings  (see  g.region,  -p3 flags), i.e.  the current region
17       extent, vertical extent and current 3D resolution are used.  If the  3D
18       resolution  differs  from  that  of the input raster map(s), on-the-fly
19       resampling is performed (nearest neighbor resampling).  If this is  not
20       desired, the input map(s) has/have to be reinterpolated beforehand with
21       one of the dedicated modules.  Masks can be set (r3.mask).
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23   Voxel operations
24       Powerful 3D map algebra is implemented in r3.mapcalc.
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26   Voxel conversion to vector or 2D raster maps
27       3D vector point data  can  be  converted  to  a  GRASS  3D  raster  map
28       (v.to.rast3).   Layers  from  a  3D raster map can be converted to a 2D
29       raster  map  (r3.to.rast).   Cross  sectional  2D  raster  map  can  be
30       extracted   from   3D   raster   map   based  on  a  2D  elevation  map
31       (r3.cross.rast).
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33   Voxel statistics
34       Volume statistics can be calculated with r3.stats and r3.univar.
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36   Voxel interpolation
37       From 3D vector  points,  GRASS  3D  raster  maps  can  be  interpolated
38       (v.vol.rst).  Results  are  volumes,  or  2D  raster  maps  can be also
39       extracted.
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41   Voxel export
42       GRASS 3D raster maps can be exported to VTK  (r3.out.vtk).   VTK  files
43       can  be visualized with the VTK Toolkit, Paraview and MayaVi.  GRASS 2D
44       raster maps can be exported to VTK with r.out.vtk,  GRASS  vector  maps
45       can be exported to VTK with v.out.vtk.
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47       Alternatively,  GRASS  3D  raster  maps  can  be  imported and exported
48       from/to Vis5D (r3.out.v5d).  Note that Vis5D is limited in  the  number
49       of supported voxels.
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51       Finally, export to 3D ASCII is also available (r3.out.ascii).
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53   See also
54       Introduction to GRASS raster map processing
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56       full index
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60GRASS 6.3.0                                                   raster3dintro(1)
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