TA (landscape level)

Total area (Area and edge metric)

Usage

lsm_l_ta(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

$$CA = sum(AREA[patch_{ij}])$$ where $AREA[patch_{ij}]$ is the area of each patch in hectares.

TA is an 'Area and edge metric'. The total (class) area sums the area of all patches in the landscape. It is the area of the observation area.

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

Units

Hectares

Range

TA > 0

Behaviour

Approaches TA > 0 if the landscape is small and increases, without limit, as the size of the landscape 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

Examples

landscape <- terra::rast(landscapemetrics::landscape)
lsm_l_ta(landscape)
#> # A tibble: 1 × 6
#>   layer level     class    id metric value
#>   <int> <chr>     <int> <int> <chr>  <dbl>
#> 1     1 landscape    NA    NA ta      0.09