lsm_c_ed {landscapemetrics} | R Documentation |
ED (class level)
Description
Edge Density (Area and Edge metric)
Usage
lsm_c_ed(landscape, count_boundary = FALSE, directions = 8)
Arguments
landscape |
A categorical raster object: SpatRaster; Raster* Layer, Stack, Brick; stars or a list of SpatRasters. |
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). |
Details
ED = \frac{\sum \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.
Units
Meters per hectare
Range
ED >= 0
Behaviour
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
Value
tibble
References
McGarigal K., SA Cushman, and E Ene. 2023. FRAGSTATS v4: Spatial Pattern Analysis Program for Categorical Maps. Computer software program produced by the authors; available at the following web site: https://www.fragstats.org
See Also
Examples
landscape <- terra::rast(landscapemetrics::landscape)
lsm_c_ed(landscape)