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v.kernel

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v.kernel: Generates a raster density map from vector points data using a moving 2D isotropic Gaussian kernel or optionally

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.

KEYWORDS

vector, kernel density

SYNOPSIS

v.kernel v.kernel help v.kernel [-oqv] input=name [net=name] output=name stddeviation=float [dsize=float] [segmax=float] [distmax=float] [mult=float] [--verbose] [--quiet] 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 --verbose Verbose module output --quiet Quiet module output Parameters: input=name Input vector with training points net=name Input network vector map output=name Output raster/vector map stddeviation=float Standard deviation 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 11:23:39 +0100 (Tue, 11 Jan 2005) $ Full index (C) 2003-2010 GRASS Development Team V.KERNEL(1)
 
 
 

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