DESCRIPTION

r.li.edgedensity calculates:

the density of all the edge of patch i

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

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.

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.it