| lsm_l_lpi {landscapemetrics} | R Documentation |
LPI (landscape level)
Description
Largest patch index (Area and Edge metric)
Usage
lsm_l_lpi(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). |
Details
LPI = \frac{\max (a_{ij})} {A} * 100
where max(a_{ij}) is the area of the patch in square meters and A
is the total landscape area in square meters.
The largest patch index is an 'Area and edge metric'. It is the percentage of the landscape covered by the largest patch in the landscape. It is a simple measure of dominance.
Because the metric is based on distances or areas please make sure your data
is valid using check_landscape.
Units
Percentage
Range
0 < LPI <= 100
Behaviour
Approaches LPI = 0 when the largest patch is becoming small and equals LPI = 100 when only one patch is present
Value
tibble
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,
lsm_l_ta,
lsm_c_lpi
Examples
landscape <- terra::rast(landscapemetrics::landscape)
lsm_l_lpi(landscape)