NAME
r3.univar - Calculates univariate statistics from the non-null 3d cells of a raster3d map.
KEYWORDS
raster3d, statistics
SYNOPSIS
r3.univar
r3.univar help
r3.univar [-ge] input=name [percentile=float[,float,...]] [--verbose] [--quiet]
Flags:
- -g
- Print the stats in shell script style
- -e
- Calculate extended statistics
- --verbose
- Verbose module output
- --quiet
- Quiet module output
Parameters:
- input=name
- Name of input raster3d map
- percentile=float[,float,...]
- Percentile to calculate (requires extended statistics flag)
- Options: 0-100
- Default: 90
DESCRIPTION
r3.univar calculates the univariate statistics for raster3d maps.
This includes the number of cells counted, minimum and maximum cell values,
range, arithmetic mean, population variance, standard deviation, and
coefficient of variation.
If the -e extended statistics flag is given the 1st quartile, median,
3rd quartile, and given percentile are calculated.
If the -g flag is given the results are presented in a format suitable
for use in a shell script.
NOTES
As with most GRASS raster3d modules, r3.univar operates on the cell
array defined by the current 3d region settings, not the original extent and
resolution of the input map. See g.region.
This module can use large amounts of system memory when the -e
extended statistics flag is used with a very large region setting. If the
region is too large the module should exit gracefully with a memory allocation
error. Basic statistics can be calculated using any size input region.
TODO
mode, skewness, kurtosis
SEE ALSO
g.region
r.univar
r.univar.sh
r.average
r.median
r.mode
r.quantile
r.sum
r.series
r.stats
r.statistics
v.univar
v.univar.sh
AUTHORS
Soeren Gebbert
Code is based on r.univar from
Hamish Bowman, Otago University, New Zealand
and Martin Landa
Last changed: $Date: 2010-03-10 08:52:33 -0800 (Wed, 10 Mar 2010) $
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