Description Usage Arguments Details Value Examples
Extent of occurrence of a species based on convex hull polygons
1 | eoo(occurrences, polygons)
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occurrences |
a data.frame containing geographic coordinates of species occurrences, columns must be: Species, Longitude, and Latitude. Geographic coordinates must be in decimal degrees (WGS84). |
polygons |
SpatialPolygons object to clip convex hulls to these limits. Projection must be WGS84 (EPSG:4326). |
Areas are calculated in square kilometers using the Lambert Azimuthal Equal Area projection, centered on the centroid of occurrence points given as inputs.
A list containing a SpatialPolygonsDataFrame of the extent of occurrence, and a vector with the areas in km2 of the spatial polygons resulted. Projection of resulting spatial object is Lambert Azimuthal Equal Area.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | # occurrences
data("occ_f", package = "rangemap")
occ <- unique(occ_f)
# polygons
poly <- simple_wmap("simple", "Cuba")
LAEA <- LAEA_projection(occ[, 2:3])
poly_pr <- sp::spTransform(poly, LAEA)
# to fix topology problems
poly_pr <- rgeos::gBuffer(poly_pr, width = 0)
# EOO
eoo_pe <- eoo(occurrences = occ, polygons = poly_pr)
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