r.li.padsd(1grass) GRASS GIS User's Manual r.li.padsd(1grass)
NAME
r.li.padsd - Calculates standard deviation of patch area a raster map
KEYWORDS
raster, landscape structure analysis, patch index
SYNOPSIS
r.li.padsd
r.li.padsd --help
r.li.padsd 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.padsd calculates the standard deviation of patch area sizes in
hectares as:
with:
• MPS: mean patch area size
• ai: area of patch i
• Npatch: number of patches
This index is calculated using a 4 neighbour algorithm, diagonal cells
are ignored when tracing a patch.
NOTES
Do not use absolute path names for the config and output file/map pa-
rameters. 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\App-
Data\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 standard deviation 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.padsd 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.padsd input=forests conf=movwindow7 out=forests_padsd_mov7
r.univar forests_padsd_mov7
Forest map (North Carolina sample dataset) example:
g.region raster=landclass96 -p
r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
r.li.padsd input=forests conf=movwindow7 out=forests_padsd_mov7
# verify
r.univar forests_padsd_mov7
r.to.vect input=forests output=forests type=area
d.mon wx0
d.rast forests_padsd_mov7
d.vect forests type=boundary
SEE ALSO
r.li - package overview
g.gui.rlisetup
REFERENCES
McGarigal, K., and B. J. Marks. 1995. FRAGSTATS: spatial pattern analy-
sis program for quantifying landscape structure. USDA For. Serv. Gen.
Tech. Rep. PNW-351. (PDF)
AUTHORS
Michael Shapiro - CERL (patch identification)
Markus Metz (statistics)
SOURCE CODE
Available at: r.li.padsd source code (history)
Accessed: unknown
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GRASS 7.8.7 r.li.padsd(1grass)
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