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lsm_l_rpr

RPD (landscape level)

Description

Relative patch richness (Diversity metric)

Usage

lsm_l_rpr(landscape, classes_max = NULL, verbose = TRUE)

Arguments

landscape

Raster* Layer, Stack, Brick, SpatRaster (terra), stars, or a list of rasterLayers.
classes_max

Potential maximum number of present classes
verbose

Print warning message if not sufficient patches are present

Details

RPR = \frac{m} {m_{max}} * 100

where m is the number of classes and m_{max} is the (theoretical) maximum number of classes.

RPR is an 'Diversity metric'. The metric calculates the percentage of present classes in the landscape in relation to a (theoretical) number of maximum classes. The user has to specify the maximum number of classes. Note, that if classes_max is not provided, the functions returns NA.

Units

Percentage

Ranges

0 < RPR <= 100

Behaviour

Approaches RPR > 0 when only one class type is present, but the maximum number of classes is large. Equals RPR = 100 when m = m_max

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

Romme, W. H. 1982. Fire and landscapediversity in subalpine forests of Yellowstone National Park.Ecol.Monogr. 52:199-221

Examples

lsm_l_rpr(landscape, classes_max = 5)
landscapemetrics

Landscape Metrics for Categorical Map Patterns

v1.5.2
GPL-3
Authors
Maximillian H.K. Hesselbarth [aut, cre] (<https://orcid.org/0000-0003-1125-9918>), Marco Sciaini [aut] (<https://orcid.org/0000-0002-3042-5435>), Jakub Nowosad [aut] (<https://orcid.org/0000-0002-1057-3721>), Sebastian Hanss [aut] (<https://orcid.org/0000-0002-3990-4897>), Laura J. Graham [ctb] (Input on package structure), Jeffrey Hollister [ctb] (Input on package structure), Kimberly A. With [ctb] (Input on package structure), Florian Privé [ctb] (Original author of underlying C++ code for get_nearestneighbour() function), Project Nayuki [ctb] (Original author of underlying C++ code for get_circumscribingcircle and lsm_p_circle), Matt Strimas-Mackey [ctb] (Bugfix in sample_metrics())
Initial release

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