Rechercher une page de manuel
r.li.edgedensity
Langue: en
Version: 369955 (fedora - 01/12/10)
Section: 1 (Commandes utilisateur)
NAME
r.li.edgedensity - Calculates edge density index on a raster map, using a 4 neighbour algorithmKEYWORDS
raster, landscape structure analysis, patch indexSYNOPSIS
r.li.edgedensityr.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
- k: patch type
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.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
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.
SEE ALSO
r.liAUTHORS
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 17:52:53 +0100 (Thu, 08 Feb 2007) $
Full index
© 2003-2008 GRASS Development Team
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre