Number of patches (Aggregation metric)
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).
NP = N
where N is the number of patches.
NP is an 'Aggregation metric'. It describes the fragmentation of the landscape, however, does not necessarily contain information about the configuration or composition of the landscape.
NP >= 1
Equals NP = 1 when only one patch is present and increases, without limit, as the number of patches 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: http://www.umass.edu/landeco/research/fragstats/fragstats.html
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