---
name: "r.le.patch"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "6.4.4-1"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/r.le.patch"
---

# r.le.patch(1grass)

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

## 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, landscape structure analysis, patch index

## 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 gp	a7 = 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 gp	s7 = 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 size	c5 = mn. core size by gp	c6 = s.d. core size by gp	c7 = mn. edge size by gp	c8 = s.d. edge size by gp	c9 = no. by size class		c10 = 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 gp	h5 = 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 (Wed, 04 Feb 2009) $*

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