s.vol.idw
NAME
s.vol.idw - Interpolates point data to a 3D grid.
(GRASS 3D Program)
SYNOPSIS
s.vol.idw
s.vol.idw help
s.vol.idw input=name output=name
[npoints=count]
[field=value]
DESCRIPTION
s.vol.idw fills a GRID3D raster volume matrix with
interpolated values generated from a set of irregularly spaced data
points using numerical approximation (weighted averaging)
techniques. The interpolated value of a tile is determined
by values of nearby data points and the distance of the
cell from those input points. In comparison with other
methods, numerical approximation allows representation of
more complex volumes (particularly those with anomalous
features), restricts the spatial influence of any errors,
and generates the interpolated volume from the data
points.
Parameters:
- input
- Name of input 3D sites file
- output
- Name of output 3D - G3D raster file
- npoints
- Number of interpolation points
- Default: 12
- field
- Number of z-field attribute to use for calculation
- default: 1
NOTES
If two or more sites fall into one voxel, the last site value will determine
the 3dcell value (no warning yet).
SEE ALSO
s.vol.rst,
s.to.rast3
AUTHOR
Jaro Hofierka
hofierka@geomodel.sk
Last changed: $Date$