r.li.padsd.1grass - Man Page

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:

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\GRASS8\r.li\output\ (MS-Windows) or $HOME/.grass8/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)

Source Code

Available at: r.li.padsd source code (history)

Accessed: Tuesday Mar 19 11:02:01 2024

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