Patch area (Area and edge metric)
lsm_p_area(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).
$$AREA = a_{ij} * (\frac{1} {10000})$$ where \(a_{ij}\) is the area in square meters.
AREA is an 'Area and edge metric' and equals the area of each patch in hectares. The lower limit of AREA is limited by the resolution of the input raster, i.e. AREA can't be smaller than the resolution squared (in hectares). It is one of the most basic, but also most important metrics, to characterise a landscape. The metric is the simplest measure of composition.
Hectares
AREA > 0
Increases, without limit, as the patch size 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_c_area_mn,
lsm_c_area_sd,
lsm_c_area_cv,
lsm_c_ca,
lsm_l_area_mn,
lsm_l_area_sd,
lsm_l_area_cv,
lsm_l_ta