Bathymetric data is also made available to host country hydrographic departments in order to supplement their oceanographic mapping programs.
Similar techniques are applied in bathymetric surveys using sonar to determine the terrain of the ocean floor.
Generally, the volume must be inferred from bathymetric data by integration.
Even then the elongated bathymetric expression of trenches was not recognized until well into the 20th century.
Simply put, the bathymetric chart is intended to show the land if overlying waters were removed in exactly the same manner as the topographic map.
Precise ocean floor depth data from bathymetric surveys, which used modern acoustic echosounders, across this undersea plateau are lacking.
Furthermore, the short period seismicity appears to have some degree of dependency on bathymetric highs such as seamounts.
Nautical charts display the water's charted depth at specific locations with soundings and the use of bathymetric contour lines to depict the submerged surface's shape.
