The science and art of determination terrain relief with respect to a datum is called

• A. Hypsography
• B. Topography
• C. Bathymetry
• D. Uranography

Answer: (A)

The concept here is about measuring and portraying how the land rises or falls relative to a reference level. Hypsography is the study and depiction of terrain relief tied to a datum, typically mean sea level. It focuses on elevations above or below that reference, and is the term used when describing the vertical dimension of the landscape in relation to a standard surface.

Topography refers to the overall surface features of an area, including both natural and man-made elements, rather than just their heights relative to a datum. Bathymetry is about depths of bodies of water, especially the ocean floor. Uranography deals with mapping the heavens. So hypsography is the precise term for relief with respect to a datum.