lsm_p_perim function

PERIM (patch level)

Perimeter (Area and edge metric)

lsm_p_perim(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).

Returns

tibble

Details

where $p_{ij}$ is the perimeter in meters.

PERIM is an 'Area and edge metric'. It equals the perimeter of the patch including also the edge to the landscape boundary. The metric describes patch area (larger perimeter for larger patches), but also patch shape (large perimeter for irregular shapes).

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

Units

Meters

Range

PERIM > 0

Behaviour

Increases, without limit, as patch size and complexity increases.

Examples

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

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