Figure B3. Context map of the Brøgger peninsula, with the thickwhite outline showing the total coverage of the HRSC-AX surveyand with the white square indicating the location of the image tileprovided in this publication (base map: hillshade version of ASTERDEM).a geoid but to a mathematically defined reference surface,which is a rotational ellipsoid with the equatorial A and Baxes both having a radius of 6378.14 km and the polar C axishaving a radius of 6356.75 km. This results in an offset ofabout 36.5 m with respect to geoid heights; i.e., sea level inthe HRSC-AX DEM is not at 0 m, but at ∼ 36.5 m.