landscapemetrics (version 1.4.4)

lsm_l_contig_mn: CONTIG_MN (landscape level)

Description

Mean of Contiguity index (Shape metric)

Usage

lsm_l_contig_mn(landscape, directions)
# S3 method for RasterLayer
lsm_l_contig_mn(landscape, directions = 8)
# S3 method for RasterStack
lsm_l_contig_mn(landscape, directions = 8)
# S3 method for RasterBrick
lsm_l_contig_mn(landscape, directions = 8)
# S3 method for stars
lsm_l_contig_mn(landscape, directions = 8)
# S3 method for list
lsm_l_contig_mn(landscape, directions = 8)

Arguments

landscape

Raster* Layer, Stack, Brick 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).

Value

tibble

Details

$$CONTIG_{MN} = mean(CONTIG[patch_{i}])$$

where \(CONTIG[patch_{ij}]\) is the contiguity of each patch.

CONTIG_MN is a 'Shape metric'. It summarises the landscape as the mean of all patches in the landscape. 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.

Units

None

Range

0 >= CONTIG_MN <= 1

Behaviour

CONTIG equals the mean of the contiguity index on landscape level for all patches.

References

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

LaGro, J. 1991. Assessing patch shape in landscape mosaics. Photogrammetric Engineering and Remote Sensing, 57(3), 285-293

See Also

lsm_p_contig, lsm_c_contig_sd, lsm_c_contig_cv, lsm_c_contig_mn, lsm_l_contig_sd, lsm_l_contig_cv

Examples

# NOT RUN {
lsm_l_contig_mn(landscape)

# }