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
$$AREA_{MN} = mean(AREA[patch_{ij}])$$
where \(AREA[patch_{ij}]\) is the area of each patch in hectares
AREA_MN is an 'Area and Edge metric'. The metric summarises each class
as the mean of all patch areas belonging to class i. The metric is a simple way
to describe the composition of the landscape. Especially together with the total
class area (lsm_c_ca), it can also give an an idea of patch structure
(e.g. many small patches vs. few larges patches).
Units
Hectares
Range
AREA_MN > 0
Behaviour
Approaches AREA_MN = 0 if all patches are small. Increases, without
limit, as the patch areas increase.
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