Caclulate the geodesic areas of
SpatialPolygons object on the Nothern
Hemisphere Polar Stereographic grid projection
boolean indicating whether areas should be calculated for each polygon individually or for the whole object together
Area calculations are for the Polar stereographic grid with major axis of 6378273m and ellipsoid flattening of 1/298.2794111.
Area of polygon (or vector of areas if
byid is set to
Information on Polar Stereographic North projection: https://nsidc.org/data/polar-stereo/ps_grids.html
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