Normalized landscape shape index (Aggregation metric)
lsm_c_nlsi(landscape)tibble
Raster* Layer, Stack, Brick, SpatRaster (terra), stars, or a list of rasterLayers.
$$nLSI = \frac{e_{i} - \min e_{i}} {\max e_{i} - \min e_{i}}$$ where \(e_{i}\) is the total edge length in cell surfaces and \(\min e_{i}\) \(\max e_{i}\) are the minimum and maximum total edge length in cell surfaces, respectively.
nLSI is an 'Aggregation metric'. It is closely related to the lsm_c_lsi
and describes the ratio of the actual edge length of class i in relation to the
hypothetical range of possible edge lengths of class i (min/max).
Currently, nLSI ignores all background cells when calculating the minimum and maximum total edge length. Also, a correct calculation of the minimum and maximum total edge length is currently only possible for rectangular landscapes.
None
0 <= nlsi <= 1
Equals nLSI = 0 when only one squared patch is present. nLSI increases the more disaggregated patches are and equals nLSI = 1 for a maximal disaggregated (i.e. a "checkerboard pattern").
McGarigal, K., SA Cushman, and E Ene. 2012. FRAGSTATS v4: Spatial Pattern Analysis Program for Categorical and Continuous Maps. Computer software program produced by the authors at the University of Massachusetts, Amherst. Available at the following web site: https://www.umass.edu/landeco/
Patton, D. R. 1975. A diversity index for quantifying habitat "edge". Wildl. Soc.Bull. 3:171-173.
lsm_c_lsi
lsm_l_lsi