r.li.padrange - Calculates range of patch area size on a raster map

NAME  KEYWORDS  SYNOPSIS  Flags:  Parameters:  DESCRIPTION  NOTES  EXAMPLES  SEE ALSO  REFERENCES  AUTHORS  SOURCE CODE 

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NAME

r.li.padrange − Calculates range of patch area size on a raster map

KEYWORDS

raster, landscape structure analysis, patch index

SYNOPSIS

r.li.padrange
r.li.padrange −−help
r.li.padrange 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.padrange calculates the range of patch area sizes in hectares as:
with:

	•		amax: max patch area size
	•		amin: min patch area size

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).

If the sample area contains only NULL values then r.li.padrange returns NULL.

EXAMPLES

To calculate range of patch area size 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.padrange 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.padrange input=forests conf=movwindow7 out=forests_padrange_mov7
r.univar forests_padrange_mov7

Forest map (North Carolina sample dataset) example:

g.region raster=landclass96 −p
r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
r.li.padrange input=forests conf=movwindow7 out=forests_padrange_mov7
# verify
r.univar forests_padrange_mov7
r.to.vect input=forests output=forests type=area
d.mon wx0
d.rast forests_padrange_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.padrange source code (history)

Latest change: Tuesday Dec 17 20:17:20 2024 in commit: d962e90c026708a4815ea2b9f46c0e84c17de22d

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© 2003−2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual

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