lsm_c_pd {landscapemetrics} | R Documentation |
PD (class level)
Description
Patch density (Aggregation metric)
Usage
lsm_c_pd(landscape, directions = 8)
Arguments
landscape |
A categorical raster object: SpatRaster; Raster* Layer, Stack, Brick; stars or a list of SpatRasters. |
directions |
The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case). |
Details
PD = \frac{n_{i}} {A} * 10000 * 100
where n_{i}
is the number of patches and A
is the total landscape
area in square meters.
PD is an 'Aggregation metric'. It describes the fragmentation of a class, however, does not
necessarily contain information about the configuration or composition of the class. In
contrast to lsm_c_np
it is standardized to the area and comparisons among
landscapes with different total area are possible.
Units
Number per 100 hectares
Ranges
0 < PD <= 1e+06
Behaviour
Increases as the landscape gets more patchy. Reaches its maximum if every cell is a different patch.
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_pd(landscape)