Question

A global mean sea level model used as a reference surface for elevation is known as:

• A. \(\text{Datum} \)
• B. \(\text{Ellipsoid} \)
• C. \(\text{Geoid} \)
• D. \(\text{Sphere} \)

Hint:

The geoid is the most accurate model for Earth's mean sea level, used as a reference for elevation and gravity measurements.

Answer 1

The Correct Option is C

Step 1: Understanding reference surfaces for elevation. - Geoid is the equipotential surface of Earth's gravity field, representing the mean sea level used as a reference for elevation measurements. - Datum is a coordinate reference system based on a geoid or ellipsoid. - Ellipsoid is a mathematical approximation of Earth's shape. - Sphere is an oversimplified model of Earth, rarely used in geodesy.
Step 2: Selecting the correct option. Since the geoid is the actual reference for mean sea level elevation, the correct answer is c. Geoid.