Tool Fragmentation (Standard)

Grid based fragmentation analysis after Riitters et al. (2000).

(1) interior, if Density = 1.0
(2) undetermined, if Density > 0.6 and Density = Connectivity
(3) perforated, if Density > 0.6 and Density - Connectivity > 0
(4) edge, if Density > 0.6 and Density - Connectivity < 0
(5) transitional, if 0.4 < Density < 0.6
(6) patch, if Density < 0.4

References

Riitters, K., Wickham, J., O'Neill, R., Jones, B., Smith, E. (2000): Global-scale patterns of forest fragmentation. Conservation Ecology 4(2):3.https://www.srs.fs.usda.gov/pubs/ja/ja_riitters006.pdf

Author: O.Conrad (c) 2008
Menu: Grid|Analysis|Fragmentation Analysis

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Classification	Grid, input	`CLASSES`	-	-
Output	Density [Percent]	Grid, output	`DENSITY`	Density Index (Pf).	-
	Connectivity [Percent]	Grid, output	`CONNECTIVITY`	Connectivity Index (Pff).	-
	Fragmentation	Grid, output	`FRAGMENTATION`	Fragmentation Index	-
	Summary (*)	Table, output, optional	`FRAGSTATS`	-	-
Options	Grid System	Grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Class Identifier	Integer	`CLASS`	-	Default: 1
	Neighborhood	Value range	`NEIGHBORHOOD`	Moving window size = 1 + 2 * Neighborhood.	-
	Level Aggregation	Choice	`AGGREGATION`	-	Available Choices: [0] average [1] multiplicative Default: 0
	Add Border	Boolean	`BORDER`	-	Default: 0
	Connectivity Weighting	Floating point	`WEIGHT`	-	Minimum: 0.000000 Default: 1.100000
	Minimum Density [Percent]	Floating point	`DENSITY_MIN`	-	Minimum: 0.000000 Maximum: 100.000000 Default: 10.000000
	Minimum Density for Interior Forest [Percent]	Floating point	`DENSITY_INT`	if less than 100, it is distinguished between interior and core forest	Minimum: 0.000000 Maximum: 100.000000 Default: 99.000000
	Neighbourhood	Choice	`CIRCULAR`	-	Available Choices: [0] square [1] circle Default: 1
	Include diagonal neighbour relations	Boolean	`DIAGONAL`	-	Default: 1
(*) optional

Command-line

Usage: saga_cmd grid_analysis 15 [-CLASSES <str>] [-DENSITY <str>] [-CONNECTIVITY <str>] [-FRAGMENTATION <str>] [-FRAGSTATS <str>] [-CLASS <num>] [-NEIGHBORHOOD_MIN <double>] [-NEIGHBORHOOD_MAX <double>] [-AGGREGATION <str>] [-BORDER <str>] [-WEIGHT <double>] [-DENSITY_MIN <double>] [-DENSITY_INT <double>] [-CIRCULAR <str>] [-DIAGONAL <str>]
  -CLASSES:<str>            	Classification
	Grid, input
  -DENSITY:<str>            	Density [Percent]
	Grid, output
  -CONNECTIVITY:<str>       	Connectivity [Percent]
	Grid, output
  -FRAGMENTATION:<str>      	Fragmentation
	Grid, output
  -FRAGSTATS:<str>          	Summary
	Table, output, optional
  -CLASS:<num>              	Class Identifier
	Integer
	Default: 1
  -NEIGHBORHOOD_MIN:<double>	Neighborhood
	Value range
  -NEIGHBORHOOD_MAX:<double>	Neighborhood
	Value range
  -AGGREGATION:<str>        	Level Aggregation
	Choice
	Available Choices:
	[0] average
	[1] multiplicative
	Default: 0
  -BORDER:<str>             	Add Border
	Boolean
	Default: 0
  -WEIGHT:<double>          	Connectivity Weighting
	Floating point
	Minimum: 0.000000
	Default: 1.100000
  -DENSITY_MIN:<double>     	Minimum Density [Percent]
	Floating point
	Minimum: 0.000000
	Maximum: 100.000000
	Default: 10.000000
  -DENSITY_INT:<double>     	Minimum Density for Interior Forest [Percent]
	Floating point
	Minimum: 0.000000
	Maximum: 100.000000
	Default: 99.000000
  -CIRCULAR:<str>           	Neighbourhood
	Choice
	Available Choices:
	[0] square
	[1] circle
	Default: 1
  -DIAGONAL:<str>           	Include diagonal neighbour relations
	Boolean
	Default: 1