lsm_c_pd {landscapemetrics}

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.

Because the metric is based on distances or areas please make sure your data is valid using check_landscape.

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)