Calculates the Extent of Occurrence of a species based on either records or predicted distribution.
One of three options: 1) matrix of longitude and latitude (two columns) of each occurrence record; 2) matrix of easting and northing (two columns, e.g. UTM) of each occurrence record in meters; 3) RasterLayer object of predicted distribution (0/1 values).
EOO is calculated as the minimum convex polygon covering all known or predicted sites for the species.
A single value in km2.
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