lsm_c_te function

TE (class level)

Total (class) edge (Area and Edge metric)

lsm_c_te(landscape, count_boundary = FALSE, directions = 8)

Arguments

• landscape: A categorical raster object: SpatRaster; Raster* Layer, Stack, Brick; stars or a list of SpatRasters.
• count_boundary: Include landscape boundary in edge length
• directions: The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case).

Returns

tibble

Details

where $e_{ik}$ is the edge lengths in meters. TE is an 'Area and edge metric'. Total (class) edge includes all edges between class i and all other classes k. It measures the configuration of the landscape because a highly fragmented landscape will have many edges. However, total edge is an absolute measure, making comparisons among landscapes with different total areas difficult. If count_boundary = TRUE also edges to the landscape boundary are included.

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

Units

Meters

Range

TE >= 0

Behaviour

Equals TE = 0 if all cells are edge cells. Increases, without limit, as landscape becomes more fragmented

Examples

landscape <- terra::rast(landscapemetrics::landscape)
lsm_c_te(landscape)

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_perim

lsm_l_te