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r.le.patch.1grass

NAME

r.le.patch - Calculates attribute, patch size, core (interior) size, shape, fractal dimension, and perimeter measures for sets of patches in a landscape.

KEYWORDS

raster

SYNOPSIS

r.le.patch
r.le.patch help
r.le.patch [-cnptu] map=string [sam=string] [reg=string] [att=string[,string,...]] [siz=string[,string,...]] [co1=integer] [co2=string[,string,...]] [sh1=string] [sh2=string[,string,...]] [bnd=string[,string,...]] [per=string[,string,...]] [out=string] [--verbose] [--quiet]

Flags:

-c

Output map 'interior' with patch cores (specify co1 & co2)

-n

Output map 'num' with patch numbers

-p

Include sampling area boundary as perimeter

-t

Use 4 neighbor instead of 8 neighbor tracing

-u

Output maps 'units_x' with sampling units for each scale x

--verbose

Verbose module output

--quiet

Quiet module output

Parameters:

map=string

Raster map to be analyzed

sam=string

Sampling method (choose only 1 method):
       w = whole map u = units m = moving window r = regions

Default: w

reg=string

Name of regions map, only when sam = r; omit otherwise

att=string[,string,...]

a1 = mn. pixel att.            a2 = s.d. pixel att.

       a3 = mn. patch att.             a4 = s.d. patch att.    a5 = cover by gp                a6 = density by gpa7 = total density a8 = eff. mesh number

Options: a1,a2,a3,a4,a5,a6,a7,a8

siz=string[,string,...]

s1 = mn. patch size            s2 = s.d. patch size

       s3 = mn. patch size by gp       s4 = s.d. patch size by gp      s5 = no. by size class  s6 = no. by size class by gps7 = eff. mesh size s8 = deg. landsc. division

Options: s1,s2,s3,s4,s5,s6,s7,s8

co1=integer

Depth-of-edge-influence in pixels (integer) for use with co2

co2=string[,string,...]

Core size measures (required if co1 was specified):
       c1 = mn. core size              c2 = s.d. core size     c3 = mn. edge size              c4 = s.d. edge sizec5 = mn. core size by gpc6 = s.d. core size by gpc7 = mn. edge size by gpc8 = s.d. edge size by gpc9 = no. by size classc10 = no. by size class by gp

Options: c1,c2,c3,c4,c5,c6,c7,c8,c9,c10

sh1=string

Shape index (choose only 1 index):
       m1 = per./area m2 = corr. per./area m3 = rel. circum. circle

sh2=string[,string,...]

Shape measures (required if sh1 was specified):
       h1 = mn. patch shape            h2 = s.d. patch shape   h3 = mn. patch shape by gp      h4 = s.d. patch shape by gph5 = no. by shape class h6 = no. by shape class by gp

Options: h1,h2,h3,h4,h5,h6

bnd=string[,string,...]

n1 = mn. twist number n2 = s.d. twist number
       n3 = mn. omega index n4 = s.d. omega index

Options: n1,n2,n3,n4

per=string[,string,...]

p1 = sum of perims.            p4 = sum of perims. by gp

       p2 = mn. per.                   p5 = mn. per. by gp     p3 = s.d. per.                  p6 = s.d. per. by gp

Options: p1,p2,p3,p4,p5,p6

out=string

Name of output file for individual patch measures, when sam=w,u,r;
       if out=head, then column headings will be printed

DESCRIPTION

The r.le.patch module calculates attribute, patch size, core (interior) size, shape, fractal dimension, and perimeter measures for sets of patches in a landscape.

NOTES

Full instructions can be found in the r.le manual (see "REFERENCES" section below) and the r.le.setup help page.

REFERENCES

Baker, W.L. and Y. Cai. 1992. The r.le programs for multiscale analysis of landscape structure using the GRASS geographical information system. Landscape Ecology 7(4):291-302.

The r.le manual: Quantitative analysis of landscape structures (GRASS 5; 2001)

SEE ALSO

r.le.pixel, r.le.setup, r.le.trace

AUTHOR

William L. Baker Department of Geography and Recreation University of Wyoming Laramie, Wyoming 82071 U.S.A.

Last changed: $Date: 2009-02-04 03:03:33 +0100 (mer, 04 feb 2009) $

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