Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.

**-a**- Set for 8 cell-neighbors. 4 cell-neighbors are default
**--overwrite**- Allow output files to overwrite existing files
**--help**- Print usage summary
**--verbose**- Verbose module output
**--quiet**- Quiet module output
**--ui**- Force launching GUI dialog

**input**=*name***[required]**- Raster map containing categories
**output**=*name***[required]**- Output patch-based result as raster map
**keyval**=*integer***[required]**- The value of the class to be analysed
**method**=*string***[required]**- Operation to perform on fragments
- Options:
*area, perimeter, shape, border, compactness, asymmetry, area-perimeter, fractal, ENN* **title**=*"phrase"*- Title for resultant raster map

Available options for the index to be computed for patches within a certain class are: area (area), perimeter (perim), SHAPE (shape), Border-Index (bor), Compactness (comp), Asymmetry (asym), area-perimeter ratio (apr), fractal dimension (fract), distance to euclidean nearest neighbour (ENN).

**Area**- The
*Area*computes the area of each patch. **Perimeter**- The
*Perimeter*computes the perimeter of each patch. **Area-Perimeter ratio**- The
*Area-Perimeter ratio*divides the patch perimeter by the area. **SHAPE Index**- The
*SHAPE Index*divides the patch perimete by the minimum perimeter possible for a maximally compact patch of the corresponding patch area. **Border Index**- The
*Border Index*.... **Compactness Index**- The
*Compactness Index*.... **Asymmetry Index**- The
*Border Index*.... **Fractal Dimension Index**- The
*Fractal Dimension Index*.... **Nearest Neighbour Index**- The
*Nearest Neighbour Index*computes the Euclidean distance to the first nearest neighbour patch.

g.region rast=landclass96

r.pi.index input=landclass96 output=landclass96_forestclass5_area keyval=5 method=area # improve colouring of resulting map: r.colors landclass96_forestclass5_area col=bgyr

r.pi.index input=landclass96 output=landclass96_forestclass5_area keyval=5 method=area -a

r.pi.index input=landclass96 output=landclass96_forestclass5_ENN keyval=5 method=ENN -a

Scientific concept: Dr. Martin Wegmann

Department of Remote Sensing

Remote Sensing and Biodiversity Unit

University of Wuerzburg, Germany

Port to GRASS GIS 7: Markus Metz

Available at: r.pi.index source code (history)

Latest change: Monday Jun 28 07:54:09 2021 in commit: 1cfc0af029a35a5d6c7dae5ca7204d0eb85dbc55

Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.

Main index | Raster index | Topics index | Keywords index | Graphical index | Full index

© 2003-2023 GRASS Development Team, GRASS GIS 7.8.8dev Reference Manual