NAME
r.li.mpa - Calculates mean pixel attribute index on a raster map
KEYWORDS
raster,
landscape structure analysis,
patch index
SYNOPSIS
r.li.mpa
r.li.mpa --help
r.li.mpa 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.mpa (mean pixel attribute) calculates the average value of the
attribute of all the non-null cells in the sampling area as:
with:
- i: attribute
- m: number of non-null attributes in the sampling area
- wi: number of cells of attribute i
- size: size of sampling area (in cells)
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 input raster map contains only NULL values then r.li.mpa considers to
have 0 patches.
If area is 0 r.li.mpa returns -1; it is possible only if the
raster is masked
If you want to change these -1 values to NULL, run subsequently on the resulting map:
r.null setnull=-1 input=my_map
after index calculation.
To calculate the mean pixel attribute 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.mpa 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.mpa input=forests conf=movwindow7 out=forests_mpa_mov7
r.univar forests_mpa_mov7
Forest map (North Carolina sample dataset) example:
g.region raster=landclass96 -p
r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
r.li.mpa input=forests conf=movwindow7 out=forests_mpa_mov7
# verify
r.univar forests_mpa_mov7
r.to.vect input=forests output=forests type=area
d.mon wx0
d.rast forests_mpa_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)
Serena Pallecchi student of Computer Science University of Pisa (Italy).
Commission from Faunalia Pontedera (PI), Italy (www.faunalia.it)
Markus Metz
SOURCE CODE
Available at:
r.li.mpa source code
(history)
Latest change: Friday Dec 06 16:55:34 2024 in commit: f3405fe2979802f7bece4cbc55202031e3fc131b
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GRASS Development Team,
GRASS GIS 8.5.0dev Reference Manual