m = number of patch types (classes) present in the landscape, excluding the landscape border if present.
Description PR equals the number of different patch types present within the landscape boundary.
Units None
Range PR ≥ 1, without limit
Comments Patch richness is perhaps the simplest measure of landscape composition, but note that it does not reflect the relative abundances of patch types. Note, this metric is redundant with both patch richness density and relative patch richness.