r.li.edgedensitygrass - Online in the Cloud

PROGRAM:

NAME

r.li.edgedensity - Calculates edge density index on a raster map, using a 4 neighbour
algorithm

KEYWORDS

raster, landscape structure analysis, patch index

SYNOPSIS

r.li.edgedensity
r.li.edgedensity --help
r.li.edgedensity [-b] input=name config=name output=name [patch_type=string]
[--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:
-b
Exclude border edges

--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

patch_type=string
The value of the patch type
It can be integer, double or float; it will be changed in function of map type

DESCRIPTION

r.li.edgedensity calculates:

· the density of all edges of patch type k , or

· the density of all edges in the sampling area if k is not specified,

with:

· k: patch type

· m: number of patch types

· n: number of edge segments of patch type k

· eik :total edge length in the landscape involving patch type k

· Area: total landscape area

The unit is meters per hectare.

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).

If the input raster map contains only NULL values then r.li.edgedensity consider to have 0
patches.
If area is 0 r.li.edgedensity returns NULL; this is only possible if input raster is
masked.

EXAMPLES

To calculate the edge density 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.edgedensity input=my_map conf=my_conf output=my_out
To calculate edge density index of patch_type 34, using "my_conf" configuration file and
on map "my_map", saving results in "my_out" file run:
r.li.edgedensity input=my_map conf=my_conf output=my_out patch_type=34

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.edgedensity input=forests conf=movwindow7 out=forests_edgedens_mov7
r.univar forests_edgedens_mov7

Forest map (North Carolina sample dataset) example:
g.region raster=landclass96 -p
r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
r.li.edgedensity input=forests conf=movwindow7 out=forests_edgedensity_mov7
# verify
r.univar forests_edgedensity_mov7
r.to.vect input=forests output=forests type=area
d.mon wx0
d.rast forests_edgedensity_mov7
d.vect forests type=boundary

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