lsm_p_para {landscapemetrics} | R Documentation |
PARA (patch level)
Description
Perimeter-Area ratio (Shape metric)
Usage
lsm_p_para(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
PARA = \frac{p_{ij}} {a_{ij}}
where p_{ij}
is the perimeter in meters and a_{ij}
is the
area in square meters.
PARA is a 'Shape metric'. It describes the patch complexity in a straightforward way. However, because it is not standarised to a certain shape (e.g. a square), it is not scale independent, meaning that increasing the patch size while not changing the patch form will change the ratio.
Units
None
Range
PARA > 0
Behaviour
Increases, without limit, as the shape complexity increases.
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_p_area
,
lsm_p_perim
,
lsm_c_para_mn
,
lsm_c_para_sd
,
lsm_c_para_cv
,
lsm_l_para_mn
,
lsm_l_para_sd
,
lsm_l_para_cv
Examples
landscape <- terra::rast(landscapemetrics::landscape)
lsm_p_para(landscape)