lsm_c_pd: PD (class level)

Description Usage Arguments Details Value References See Also Examples

Description

Patch density (Aggregation metric)

Usage

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lsm_c_pd(landscape, directions)

## S3 method for class 'RasterLayer'
lsm_c_pd(landscape, directions = 8)

## S3 method for class 'RasterStack'
lsm_c_pd(landscape, directions = 8)

## S3 method for class 'RasterBrick'
lsm_c_pd(landscape, directions = 8)

## S3 method for class 'stars'
lsm_c_pd(landscape, directions = 8)

## S3 method for class 'list'
lsm_c_pd(landscape, directions = 8)

Arguments

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).

Details

PD = \frac{n_{i}} {A} * 10000 * 100

where n_{i} is the number of patches and A is the total landscape area in square meters.

PD is an 'Aggregation metric'. It describes the fragmentation of a class, however, does not necessarily contain information about the configuration or composition of the class. In contrast to lsm_c_np it is standardized to the area and comparisons among landscapes with different total area are possible.

Units

Number per 100 hectares

Ranges

0 < PD <= 1e+06

Behaviour

Increases as the landscape gets more patchy. Reaches its maximum if every cell is a different patch.

Value

tibble

References

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

See Also

lsm_c_np, lsm_l_ta,
lsm_l_pd

Examples

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r-spatialecology/landscapemetrics documentation built on May 20, 2019, noon