NAME
r.li.patchnum - Calculates patch number index on a raster map, using a 4 neighbour algorithm.
KEYWORDS
raster,
landscape structure analysis,
patch index
SYNOPSIS
r.li.patchnum
r.li.patchnum --help
r.li.patchnum 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
r.li.patchnum calculates the "patch number index" as:
f(sample_area)= Patch_Number
This index is calculated using a 4 neighbour algorithm, diagonal cells
are ignored when tracing a patch.
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 it is considered to
have zero patches.
To calculate patch number 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.patchnum input=my_map conf=my_conf out=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.patchnum input=forests conf=movwindow7 out=forests_patchnum_mov7
r.univar forests_patchnum_mov7
Forest map (North Carolina sample dataset) example:
g.region raster=landclass96 -p
r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
r.li.patchnum input=forests conf=movwindow7 out=forests_patchnum_mov7
# verify
r.univar forests_patchnum_mov7
r.to.vect input=forests output=forests type=area
d.mon wx0
d.rast forests_patchnum_mov7
d.vect forests type=boundary
r.li (package overview),
g.gui.rlisetup
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)
Michael Shapiro - CERL (patch identification)
Markus Metz (statistics)
SOURCE CODE
Available at:
r.li.patchnum source code
(history)
Latest change: Friday Dec 06 16:55:34 2024 in commit: f3405fe2979802f7bece4cbc55202031e3fc131b
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© 2003-2024
GRASS Development Team,
GRASS GIS 8.5.0dev Reference Manual