Fig. 1
From: Bathymetric effect on geoid modeling over the Great Lakes area
Sketches of the real topographic model in the case of water masses being a totally or b partly above the geoid. If the water masses with the density \(\rho_{{\text{w}}}\) (the blue part) is substituded by the rock masses with the density \(\rho_{0}\), the real topographic model then becomes the topographic model corresponding to the RTM-Base scheme