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NP (class level)

Source: R/lsm_c_np.R
lsm_c_np.Rd

Number of patches (Aggregation metric)

Usage

lsm_c_np(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

$$NP = n_{i}$$ where \(n_{i}\) is the number of patches.

NP is an 'Aggregation metric'. It describes the fragmentation of a class, however, does not necessarily contain information about the configuration or composition of the class.

Units

None

Ranges

NP >= 1

Behaviour

Equals NP = 1 when only one patch is present and increases, without limit, as the number of patches increases

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_l_np

Examples

landscape <- terra::rast(landscapemetrics::landscape)
lsm_c_np(landscape)
#> # A tibble: 3 × 6
#>   layer level class    id metric value
#>   <int> <chr> <int> <int> <chr>  <dbl>
#> 1     1 class     1    NA np         9
#> 2     1 class     2    NA np        13
#> 3     1 class     3    NA np         6