DCAD (class level)
Disjunct core area density (core area metric)
lsm_c_dcad( landscape, directions = 8, consider_boundary = FALSE, edge_depth = 1 )
landscape |
Raster* Layer, Stack, Brick, SpatRaster (terra), stars, or a list of rasterLayers. |
directions |
The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case). |
consider_boundary |
Logical if cells that only neighbour the landscape boundary should be considered as core |
edge_depth |
Distance (in cells) a cell has the be away from the patch edge to be considered as core cell |
DCAD = (\frac{∑ \limits_{j = 1}^{n} n_{ij}^{core}} {A}) * 10000 * 100
where n_{ij}^{core} is the number of disjunct core areas and A is the total landscape area in square meters.
DCAD is a 'Core area metric'. It equals the number of disjunct core areas per 100 ha relative to the total area. A disjunct core area is a 'patch within the patch' containing only core cells. A cell is defined as core area if the cell has no neighbour with a different value than itself (rook's case). The metric is relative and therefore comparable among landscapes with different total areas.
Number per 100 hectares
DCAD >= 0
Equals DCAD = 0 when DCORE = 0, i.e. no patch of class i contains a disjunct core area. Increases, without limit, as disjunct core areas become more present, i.e. patches becoming larger and less complex.
tibble
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
lsm_c_dcad(landscape)
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