Description Usage Arguments Details Value References See Also Examples

Simpson's diversity index (Diversity metric)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | ```
lsm_l_sidi(landscape, directions)
## S3 method for class 'RasterLayer'
lsm_l_sidi(landscape, directions = 8)
## S3 method for class 'RasterStack'
lsm_l_sidi(landscape, directions = 8)
## S3 method for class 'RasterBrick'
lsm_l_sidi(landscape, directions = 8)
## S3 method for class 'stars'
lsm_l_sidi(landscape, directions = 8)
## S3 method for class 'list'
lsm_l_sidi(landscape, directions = 8)
``` |

`landscape` |
Raster* Layer, Stack, Brick or a list of rasterLayers. |

`directions` |
The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case). |

*SIDI = 1 - ∑ \limits_{i = 1}^{m} P_{i}^{2}*

where *P_{i}* is the proportion of class i and *m* is the
number of classes.

SIDI is a 'Diversity metric'. It is widely used in biodiversity and ecology. It is
less sensitive to rare class types than `lsm_l_shdi`

. It can be interpreted
as the probability that two randomly selected cells belong to the same class.

None

0 <= SIDI < 1

Equals SIDI = 0 when only one patch is present and approaches SIDI < 1 when the number of class types increases while the proportions are equally distributed

tibble

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: http://www.umass.edu/landeco/research/fragstats/fragstats.html

Simpson, E. H. 1949. Measurement of diversity. Nature 163:688

1 |

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.