man v.kernel () - Generates a raster density map from vector points data using a moving 2D isotropic Gaussian kernel or optionally generates a vector density map on vector network with a 1D kernel

NAME

v.kernel - Generates a raster density map from vector points data using a moving 2D isotropic Gaussian kernel or optionally generates a vector density map on vector network with a 1D kernel

SYNOPSIS

v.kernel

v.kernel help

v.kernel [-oqv] input=string [net=string] output=string stddeviation=float [dsize=float] [segmax=float] [distmax=float] [mult=float]

Flags:

"-o
Try to calculate an optimal standard deviation with 'stddeviation' taken as maximum (experimental)
"-q
Only calculate optimal standard deviation and exit (no map is written)
"-v
Run verbosely

Parameters:

"input=string
Input vector with training points
"net=string
Input network vector
"output=string
output raster/vector map
"stddeviation=float
stddeviation in map units
"dsize=float
discretization error in map units Default: 0.
"segmax=float
maximum length of segment on network Default: 100.
"distmax=float
maximum distance from point to network Default: 100.
"mult=float
multiply the density result by this number Default: 1.

DESCRIPTION

Generates a raster density map from vector points data using a moving 2D isotropic Gaussian kernel or optionally generates a vector density map on vector network with a 1D kernel.

NOTES

The mult option is needed to overcome the limitation that the resulting density in case of a vector map output is stored as category (Integer). The density result stored as category may be multiplied by this number.

With the -o flag (experimental) the command tries to calculate an optimal standard deviation. The value of stddeviation is taken as maximum value. Standard deviation is calculated using ALL points, not just those in the current region.

LIMITATIONS

The modules only considers the presence of point, but not (yet) any attribute values.

SEE ALSO

v.surf.rst

AUTHOR

Stefano Menegon, ITC-irst, Trento, Italy

Radim Blazek (network part)

Last changed: $Date: 2005/01/11 10:23:39 $

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