Description Usage Arguments Details Value References See Also Examples

Edge Density (Area and Edge metric)

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`landscape` |
Raster* Layer, Stack, Brick, SpatRaster (terra), stars, or a list of rasterLayers. |

`count_boundary` |
Count landscape boundary as edge. |

`directions` |
The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case). |

*ED = \frac{∑ \limits_{k = 1}^{m} e_{ik}} {A} * 10000*

where *e_{ik}* is the total edge length in meters and *A* is the total
landscape area in square meters.

ED is an 'Area and Edge metric'. The edge density equals the sum of all edges of class i
in relation to the landscape area. The boundary of the landscape is only included in the
corresponding total class edge length if `count_boundary = TRUE`

.
The metric describes the configuration of the landscape, e.g. because an aggregation
of the same class will result in a low edge density. The metric is standardized to the
total landscape area, and therefore comparisons among landscapes with different total
areas are possible.

Meters per hectare

ED >= 0

Equals ED = 0 if only one patch is present (and the landscape boundary is not included) and increases, without limit, as the landscapes becomes more patchy

tibble

McGarigal, K., SA Cushman, and E Ene. 2012. FRAGSTATS v4: Spatial Pattern Analysis Program for Categorical and Continuous Maps. Computer software program produced by the authors at the University of Massachusetts, Amherst. Available at the following web site: http://www.umass.edu/landeco/research/fragstats/fragstats.html

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