sea_floor_depth_below_reference_ellipsoid
https://w3id.org/hacid/data/cs/variables/cf/sea_floor_depth_below_reference_ellipsoid <https://w3id.org/hacid/onto/data/Variable>
"Depth_below_X" means the vertical distance below the named surface X. A reference ellipsoid is a regular mathematical figure that approximates the irregular shape of the geoid. A number of reference ellipsoids are defined for use in the field of geodesy. To specify which reference ellipsoid is being used, a grid_mapping variable should be attached to the data variable as described in Chapter 5.6 of the CF Convention.
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sea_floor_depth_below_reference_ellipsoid