lsm_c_para_mn {landscapemetrics} | R Documentation |
PARA_MN (class level)
Description
Mean perimeter-area ratio (Shape metric)
Usage
lsm_c_para_mn(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_{MN} = mean(PARA[patch_{ij}]
where PARA[patch_{ij}]
is the perimeter area ratio of each patch.
PARA_MN is a 'Shape metric'. It summarises each class as the mean of each patch belonging to class i. The perimeter-area ratio 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_MN > 0
Behaviour
Approaches PARA_MN > 0 if PARA for each patch approaches PARA > 0, i.e. the form approaches a rather small square. Increases, without limit, as PARA increases, i.e. patches become more complex.
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_para
,
mean
,
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_c_para_mn(landscape)