lsm_c_ai {landscapemetrics} | R Documentation |
AI (class level)
Description
Aggregation index (Aggregation metric)
Usage
lsm_c_ai(landscape)
Arguments
landscape |
A categorical raster object: SpatRaster; Raster* Layer, Stack, Brick; stars or a list of SpatRasters |
Details
AI = \Bigg[\frac{g_{ii}}{max-g_{ii}} \Bigg](100)
where g_{ii}
is the number of like adjacencies based on the single-count method and
max-g_{ii}
is the classwise maximum number of like adjacencies of class i.
AI is an 'Aggregation metric'. It equals the number of like adjacencies divided by the theoretical maximum possible number of like adjacencies for that class. The metric is based on he adjacency matrix and the the single-count method.
Units
Percent
Range
0 <= AI <= 100
Behaviour
Equals 0 for maximally disaggregated and 100 for maximally aggregated classes.
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
He, H. S., DeZonia, B. E., & Mladenoff, D. J. 2000. An aggregation index (AI) to quantify spatial patterns of landscapes. Landscape ecology, 15(7), 591-601.
See Also
Examples
landscape <- terra::rast(landscapemetrics::landscape)
lsm_c_ai(landscape)