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AREA_MN (class level)

Source: R/lsm_c_area_mn.R
lsm_c_area_mn.Rd

Mean of patch area (Area and edge metric)

Usage

lsm_c_area_mn(landscape, directions = 8)

Arguments

landscape

A categorical raster object: SpatRaster; Raster* Layer, Stack, Brick; stars or a list of SpatRasters

directions

The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case).

Value

tibble

Details

$$AREA_{MN} = mean(AREA[patch_{ij}])$$ where \(AREA[patch_{ij}]\) is the area of each patch in hectares

AREA_MN is an 'Area and Edge metric'. The metric summarises each class as the mean of all patch areas belonging to class i. The metric is a simple way to describe the composition of the landscape. Especially together with the total class area (lsm_c_ca), it can also give an an idea of patch structure (e.g. many small patches vs. few larges patches).

Because the metric is based on distances or areas please make sure your data is valid using check_landscape.

Units

Hectares

Range

AREA_MN > 0

Behaviour

Approaches AREA_MN = 0 if all patches are small. Increases, without limit, as the patch areas increase.

References

McGarigal K., SA Cushman, and E Ene. 2023. FRAGSTATS v4: Spatial Pattern Analysis Program for Categorical Maps. Computer software program produced by the authors; available at the following web site: https://www.fragstats.org

See also

lsm_p_area, mean,
lsm_c_area_cv, lsm_c_area_sd,
lsm_l_area_mn, lsm_l_area_sd, lsm_l_area_cv

Examples

landscape <- terra::rast(landscapemetrics::landscape)
lsm_c_area_mn(landscape)
#> # A tibble: 3 × 6
#>   layer level class    id metric    value
#>   <int> <chr> <int> <int> <chr>     <dbl>
#> 1     1 class     1    NA area_mn 0.00204
#> 2     1 class     2    NA area_mn 0.0018 
#> 3     1 class     3    NA area_mn 0.00803