Description Usage Arguments Details Value References Examples
Calculate patch statistics for a given class (i.e. cell value) in a numeric matrix.
1 | patch_stats(mat, class)
|
mat |
A numeric matrix. |
class |
The patch class for which statistics should be calculated. |
Statistics are based on and inspired by
SDMTools::
ClassStat
,
FRAGSTATS
and Faye et al. 2016
A dataframe containing:
class |
The patch class for which statistics were calculated. |
area |
Total area (number of cells). |
prop |
Proportion of landscape area represented by cells in the given class. |
perim |
Total perimeter (number of outside edges). |
perim_min |
Minimum perimeter, given the number of cells. |
inside_edges |
Total number of shared, inside edges. |
inside_edges_max |
Maximum number of inside edges that could be shared, given the number of cells. |
shape_index |
Patch shape index. Calculated as the observed perimeter divided by the minimum perimeter. See FRAGSTATS p.101. |
AI |
Aggregation index. Calculated as the observed number of shared, inside edges divided by the maximum number that could be shared. See He et al. 2000. |
cohesion |
Cohesion index. Calculated from the area and perimeter of cells in the given class relative to the area of the entire landscape. See Scuhmaker 1996. |
SDMTools: Species Distribution Modelling Tools: Tools for processing data associated with species distribution modelling exercises. Available on CRAN.
McGarigal, K., S. A. Cushman, M. C. Neel, and E. Ene. 2002. FRAGSTATS: Spatial Pattern Analysis Program for Categorical Maps. Computer software program produced by the authors at the University of Massachusetts, Amherst. Available at the following web site: www.umass.edu/landeco/research/fragstats/fragstats.html
Faye, E. , Rebaudo, F. , Yánez‐Cajo, D. , Cauvy‐Fraunié, S. , Dangles, O. and Tatem, A. (2016), A toolbox for studying thermal heterogeneity across spatial scales: from unmanned aerial vehicle imagery to landscape metrics. Methods Ecol Evol, 7: 437-446. https://doi.org/10.1111/2041-210X.12488
He, H.S., DeZonia, B.E. & Mladenoff, D.J. (2000), An aggregation index (AI) to quantify spatial patterns of landscapes. Landscape Ecology, 15: 591. https://doi.org/10.1023/A:1008102521322
Schumaker, N. H. (1996), Using landscape indices to predict habitat connectivity. Ecology, 77: 1210-1225. https://doi.org/10.2307/2265590
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