1raster3dintro(1)              Grass User's Manual             raster3dintro(1)
2
3
4

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 are be interpolated from 3D point clouds as transformed from  3D
9       point vector data (v.to.rast3).  Always the full map is imported.
10
11   Voxel region settings and 3D MASK
12       GRASS  3D  raster  map processing is always performed in the current 3D
13       region settings (see g.region), i.e. the current region extent,  verti‐
14       cal  extent  and  current 3D resolution are used.  If the 3D resolution
15       differs from that of the input raster map(s), on-the-fly resampling  is
16       performed  (nearest  neighbor resampling).  If this is not desired, the
17       input map(s) has/have to be reinterpolated beforehand with one  of  the
18       dedicated modules.  Masks can be set (r3.mask).
19
20   Voxel operations
21       Powerful 3D map algebra is implemented in r3.mapcalc.
22
23   Voxel conversion
24       3D  vector  point  data  can  be  converted  to  a  GRASS 3D raster map
25       (v.to.rast3).  Layers from a 3D raster map can be  converted  to  a  2D
26       raster map (r3.to.rast).
27
28   Voxel interpolation
29       From  3D  vector  points,  GRASS  3D  raster  maps  can be interpolated
30       (v.vol.rst). Results are  volumes,  or  2D  raster  maps  can  be  also
31       extracted.
32
33   Voxel export
34       GRASS  3D  raster  maps can be exported to VTK (r3.out.vtk).  VTK files
35       can be visualized with the VTK Toolkit, Paraview and MayaVi.  GRASS  2D
36       raster  maps  can  be exported to VTK with r.out.vtk, GRASS vector maps
37       can be exported to VTK with v.out.vtk.
38
39       Alternatively, GRASS 3D  raster  maps  can  be  imported  and  exported
40       from/to Vis5D (r3.out.v5d).
41
42       Finally, export to 3D ASCII is also possible (r3.out.ascii).
43
44   See also
45       Introduction to GRASS raster map processing
46
47       full index
48
49
50
51GRASS 6.2.2                                                   raster3dintro(1)
Impressum