Fragmentation (Standard)

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

Description

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

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 number	`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 number	`WEIGHT`	-	Minimum: 0.000000 Default: 1.100000
	Minimum Density [Percent]	floating point number	`DENSITY_MIN`	-	Minimum: 0.000000 Maximum: 100.000000 Default: 10.000000
	Minimum Density for Interior Forest [Percent]	floating point number	`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

Command Line

Usage: saga_cmd grid_analysis 15 [-CLASSES ] [-DENSITY ] [-CONNECTIVITY ] [-FRAGMENTATION ] [-FRAGSTATS ] [-CLASS ] [-NEIGHBORHOOD_MIN ] [-NEIGHBORHOOD_MAX ] [-AGGREGATION ] [-BORDER ] [-WEIGHT ] [-DENSITY_MIN ] [-DENSITY_INT ] [-CIRCULAR ] [-DIAGONAL ]
  -CLASSES:            	Classification
	grid, input
  -DENSITY:            	Density [Percent]
	grid, output
  -CONNECTIVITY:       	Connectivity [Percent]
	grid, output
  -FRAGMENTATION:      	Fragmentation
	grid, output
  -FRAGSTATS:          	Summary
	table, output, optional
  -CLASS:              	Class Identifier
	integer number
	Default: 1
  -NEIGHBORHOOD_MIN:	Neighborhood
	value range
  -NEIGHBORHOOD_MAX:	Neighborhood
	value range
  -AGGREGATION:        	Level Aggregation
	choice
	Available Choices:
	[0] average
	[1] multiplicative
	Default: 0
  -BORDER:             	Add Border
	boolean
	Default: 0
  -WEIGHT:          	Connectivity Weighting
	floating point number
	Minimum: 0.000000
	Default: 1.100000
  -DENSITY_MIN:     	Minimum Density [Percent]
	floating point number
	Minimum: 0.000000
	Maximum: 100.000000
	Default: 10.000000
  -DENSITY_INT:     	Minimum Density for Interior Forest [Percent]
	floating point number
	Minimum: 0.000000
	Maximum: 100.000000
	Default: 99.000000
  -CIRCULAR:           	Neighbourhood
	choice
	Available Choices:
	[0] square
	[1] circle
	Default: 1
  -DIAGONAL:           	Include diagonal neighbour relations
	boolean
	Default: 1