This is the command r.li.padcvgrass that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
r.li.padcv - Calculates coefficient of variation of patch area on a raster map
KEYWORDS
raster, landscape structure analysis, patch index
SYNOPSIS
r.li.padcv
r.li.padcv --help
r.li.padcv input=name config=name output=name [--overwrite] [--help] [--verbose]
[--quiet] [--ui]
Flags:
--overwrite
Allow output files to overwrite existing files
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog
Parameters:
input=name [required]
Name of input raster map
config=name [required]
Configuration file
output=name [required]
Name for output raster map
DESCRIPTION
r.li.padcv calculates the coefficient of variation of patch area sizes in hectares as:
with:
· SD: standard deviation of patch area size
· MPS: mean patch area size
· ai: area of patch i
· Npatch: number of patches
NOTES
Do not use absolute path names for the config and output file/map parameters. If the
"moving window" method was selected in g.gui.rlisetup, then the output will be a raster
map, otherwise an ASCII file will be generated in the folder
C:\Users\userxy\AppData\Roaming\GRASS7\r.li\output\ (MS-Windows) or
$HOME/.grass7/r.li/output/ (GNU/Linux).
The result is NULL if the sample area contains only NULL values.
EXAMPLES
To calculate patch area distribution coefficient of variation index on map my_map, using
my_conf configuration file (previously defined with g.gui.rlisetup) and saving results in
my_out, run:
r.li.padcv input=my_map conf=my_conf output=my_out
Forest map (Spearfish sample dataset) example:
g.region raster=landcover.30m -p
r.mapcalc "forests = if(landcover.30m >= 41 && landcover.30m <= 43,1,null())"
r.li.padcv input=forests conf=movwindow7 out=forests_padcv_mov7
r.univar forests_padcv_mov7
Forest map (North Carolina sample dataset) example:
g.region raster=landclass96 -p
r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
r.li.padcv input=forests conf=movwindow7 out=forests_padcv_mov7
# verify
r.univar forests_padcv_mov7
r.to.vect input=forests output=forests type=area
d.mon wx0
d.rast forests_padcv_mov7
d.vect forests type=boundary
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