lsm_l_pladj {landscapemetrics}

PLADJ (landscape level)

Description

Percentage of Like Adjacencies (Aggregation metric)

Usage

lsm_l_pladj(landscape)

Arguments

landscape

A categorical raster object: SpatRaster; Raster* Layer, Stack, Brick; stars or a list of SpatRasters.

Details

PLADJ = (\frac{g_{ij}} {\sum \limits_{k = 1}^{m} g_{ik}}) * 100

where g_{ii} is the number of adjacencies between cells of class i and g_{ik} is the number of adjacencies between cells of class i and k.

PLADJ is an 'Aggregation metric'. It calculates the frequency how often patches of different classes i (focal class) and k are next to each other, and following is a measure of class aggregation. The adjacencies are counted using the double-count method.

Units

Percent

Ranges

0 <= PLADJ <= 100

Behaviour

Equals PLADJ = 0 if class i is maximal disaggregated, i.e. every cell is a different patch. Equals PLADJ = 100 when the only one patch is present.

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.

Examples

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