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 map=
name conf=
string
output=
name [
patch_type=
string]
[--
overwrite] [--
verbose] [--
quiet]
Flags:¶
- --overwrite
-
Allow output files to overwrite existing files
- --verbose
-
Verbose module output
- --quiet
-
Quiet module output
Parameters:¶
- map=name
-
Name of input raster map
- conf=string
-
Configuration file
- output=name
-
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 the edge of patch i
or
-
the density of all the edge in the sampling area if i isn't specified
with:
- k: patch type
- m: number of patch type
- n: number of edge segment of patch type k
- eik :total length of edge in landscape involving
patch type k
-
Area: total landscape area
NOTES¶
Do not use absolute path names for output files. They are raster if moving
window disposition was selected, otherwise they are in ~/.r.li/output folder.
If input raster is full of null values r.li.edgedensity consider to have 0
patch.
If area is 0 r.li.edgedensity returns -1; this is possible only if input raster
is masked. If you want to have null values instead run
r.null setnull=-1 map=my_map
after index calculation.
EXAMPLES¶
To calculate edge density index on map my_map, using my_conf configuration file
and saving results in my_out file run:
r.li.edgedensity map=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 map=my_map conf=my_conf output=my_out patch_type=34
SEE ALSO¶
r.li
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.
AUTHORS¶
Serena Pallecchi student of Computer Science University of Pisa (Italy).
Commission from Faunalia Pontedera (PI), Italy (www.faunalia.it)
Last changed: $Date: 2011-08-16 11:13:05 +0200 (Tue, 16 Aug 2011) $
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