Rechercher une page de manuel
r.li.cwed
Langue: en
Version: 368985 (fedora - 01/12/10)
Section: 1 (Commandes utilisateur)
NAME
r.li.cwed - Calculates contrast weighted edge density index on a raster mapKEYWORDS
raster, landscape structure analysis, patch indexSYNOPSIS
r.li.cwedr.li.cwed help
r.li.cwed map=name conf=string path=string output=name [--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- path=string
input file that contains the weight to calculate the index- output=name
Name for output raster map
DESCRIPTION
r.li.cwed (contrast weighted edge density) calculates the edge density between patch types specified:with:
-
k: attribute
m: number of non-null attributes in the sampling area
eik: total length of edge in landscape between patch types i and k
- dik: dissimilarity (edge contrast weight) between patch types i and k
Area: total landscape area
The input file have a row for each couple of patch type that we want to consider in the calculation. Each row must to have this syntax:
patchType1,patchType2,dissimilarityBetweenPatchType1andPatchType2
EXAMPLES
To calculate mean pixel attribute index on map my_map, using my_conf configuration file and saving results in my_out file run:r.li.cwed map=my_map conf=my_conf path=my_file output=my_out
Example of input file: 12,16,0.65
44,123,0.32
56,12,0.54
23,66,0.99
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 the raster is full of null value it is considered to have 0 patch and CWED=0. If Area is 0 r.li.cwed returns -1. This is possible only if the map is masked.
If you want to have null values instead run
r.null setnull=-1 map=my_map
after index calculation.
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.SEE ALSO
r.li package overviewr.li.daemon
r.li.setup
AUTHORS
Serena Pallecchi student of Computer Science University of Pisa (Italy).Commission from Faunalia Pontedera (PI), Italy (www.faunalia.it)
BUGS
Please send bugs reports to pallecch@cli.di.unipi.itLast changed: $Date: 2007-02-08 17:33:52 +0100 (Thu, 08 Feb 2007) $
Full index
© 2003-2008 GRASS Development Team
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre