Description Usage Arguments Details Value References Examples

Patch richness density (Diversity metric)

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

*PRD = \frac{m} {A} * 10000 * 100 *

where *m* is the number of classes and *A* is the total landscape area in
square meters.

PRD is a 'Diversity metric'. It is one of the simplest diversity and composition measures.
In contrast to `lsm_l_pr`

, it is a relative measure and following, comparable
among landscapes with different total landscape areas.

Number per 100 hectares

PR > 0

Approaches PRD > 1 when only one patch is present and the landscape is rather large. Increases, without limit, as the number of classes increases and the total landscape area decreases.

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

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