View source: R/lsm_c_contig_mn.R
lsm_c_contig_mn | R Documentation |
Mean of Contiguity index (Shape metric)
lsm_c_contig_mn(landscape, directions = 8)
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). |
CONTIG_{MN} = mean(CONTIG[patch_{ij}])
where CONTIG[patch_{ij}]
is the contiguity of each patch.
CONTIG_MN is a 'Shape metric'. It summarises each class as the mean of each patch belonging to class i. CONTIG_MN asses the spatial connectedness (contiguity) of cells in patches. The metric coerces patch values to a value of 1 and the background to NA. A nine cell focal filter matrix:
filter_matrix <- matrix(c(1, 2, 1, 2, 1, 2, 1, 2, 1), 3, 3, byrow = T)
... is then used to weight orthogonally contiguous pixels more heavily than diagonally contiguous pixels. Therefore, larger and more connections between patch cells in the rookie case result in larger contiguity index values.
None
0 >= CONTIG_MN <= 1
CONTIG equals the mean of the contiguity index on class level for all patches.
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: https://www.umass.edu/landeco/
LaGro, J. 1991. Assessing patch shape in landscape mosaics. Photogrammetric Engineering and Remote Sensing, 57(3), 285-293
lsm_p_contig
,
lsm_c_contig_sd
,
lsm_c_contig_cv
,
lsm_l_contig_mn
,
lsm_l_contig_sd
,
lsm_l_contig_cv
lsm_c_contig_mn(landscape)
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