lsm_c_pd: PD (class level)

In r-spatialecology/landscapemetrics: Landscape Metrics for Categorical Map Patterns

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

lsm_c_np, lsm_l_ta,
lsm_l_pd

Examples

landscape <- terra::rast(landscapemetrics::landscape)
lsm_c_pd(landscape)

r-spatialecology/landscapemetrics documentation built on April 3, 2024, 2:21 a.m.