r.li.padsd (1)
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:
o MPS: mean patch area size
o ai: area of patch i
o 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 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 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 analysis program for quantifying landscape structure. USDA For. Serv. Gen. Tech. Rep. PNW-351. (PDF)
AUTHORS
Michael Shapiro - CERL (patch identification)
Markus Metz (statistics)
Last changed: $Date: 2014-12-19 22:17:36 +0100 (Fri, 19 Dec 2014) $
SOURCE CODE
Available at: r.li.padsd source code (history)
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2003-2017 GRASS Development Team, GRASS GIS 7.2.1 Reference Manual