GRASS GIS Manual: r3.in.xyz

NAME

r3.in.xyz

DESCRIPTION

r3.in.xyz imports sparse XYZ data from an ASCII file into a 3D raster map (voxels). It does this by running the r.in.xyz module multiple times for different z-ranges and then assembling the slices with r.to.rast3.

See the r.in.xyz help page for general parameter usage and tips.

The map is created using the rows, columns, and depths set by current region settings. Be sure to check and adjust these with the g.region module before performing the import.

NOTES

The 2D and 3D horizontal region resolutions must match. See the EXAMPLES section below.

Unlike r.in.xyz, reading from stdin and z-scaling are not possible.

To enable parallel processing support, set the workers= option to match the number of CPUs or CPU-cores avaiable on your system.

Points falling exactly on a vertical bound will belong to the depth band below them, except for points exactly on the top bound, which will belong to the top-most slice.

The script is expected to be nearly as efficient as if it was fully written in C.

EXAMPLE

Using the Serpent Mound dataset. (see the GRASS LiDAR wiki page)

  #scan dataset for extent:
  r3.in.xyz -s in=Serpent_Mound_Model_LAS_Data.txt out=dummy \
     x=1 y=2 z=3 fs=space

  # set the 2D and 3D regions:
  g.region n=4323641.57 s=4320942.61 w=289020.90 e=290106.02 res=1 -a
  g.region b=166 t=216 res3=1 tbres=5 -3 -p

  r3.in.xyz in=Serpent_Mound_Model_LAS_Data.txt out=serpent3D \
     method=mean x=1 y=2 z=3 fs=space type=float

BUGS

r.to.rast3 always creates a double output map regardless of input.

AUTHOR

Hamish Bowman
Dunedin, New Zealand

Last changed: $Date$