Coefficient of variation perimeter-area ratio (Shape metric)
lsm_l_para_cv(landscape, directions = 8)tibble
Raster* Layer, Stack, Brick, SpatRaster (terra), stars, or a list of rasterLayers.
The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case).
$$PARA_{CV} = cv(PARA[patch_{ij}]$$ where \(PARA[patch_{ij}]\) is the perimeter area ratio of each patch.
PARA_CV is a 'Shape metric'. It summarises the landscape as the Coefficient of variation of each patch belonging in the landscape 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.
None
PARA_CV >= 0
Equals PARA_CV = 0 if the perimeter-area ratio is identical for all patches. Increases, without limit, as the variation of the perimeter-area ratio increases.
McGarigal, K., SA Cushman, and E Ene. 2012. FRAGSTATS v4: Spatial Pattern Analysis Program for Categorical and Continuous Maps. Computer software program produced by the authors at the University of Massachusetts, Amherst. Available at the following web site: https://www.umass.edu/landeco/
lsm_p_para,
cv,
lsm_c_para_mn,
lsm_c_para_sd,
lsm_c_para_cv,
lsm_l_para_mn,
lsm_l_para_sd