Elevation limits.
Calculates the elevation (or depth) limits (range) of a species based on either known records or predicted distribution.
elevation(spData, dem = NULL)
spData |
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). |
dem |
RasterLayer object. Should be a digital elevation model (DEM) of the relevant area. If not given the function will try to read it from base data, only works with longlat data. |
Maximum and minimum elevation are calculated based on the DEM.
A vector with two values (min and max) in meters above (or below) sea level.
data(red.records) data(red.range) data(red.layers) dem = red.layers[[3]] elevation(red.records, dem) elevation(red.range, dem)
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