What term describes the altitude relative to a given datum?

The term that describes the altitude relative to a given datum is elevation. Elevation specifically refers to how high a point is above a reference level, typically sea level. This distinction is important in various fields, including grading, drainage, and stormwater management, as different benchmarks or datums can significantly influence measurements and design considerations.

Altitude usually refers to the height of an object or point in relation to sea level or ground level but is often used in specific contexts such as aviation or meteorology. Height can generally refer to the measurement of something from base to top, without necessarily referencing a datum, making it more ambiguous in this context. Grade typically refers to a slope or inclination, rather than a vertical measurement in relation to a datum. Hence, elevation is the most precise term for describing altitude in relation to a specific reference point.