Which of the following are land surveying datum types?

Which of the following are land surveying datum types?

• A. Horizontal
• B. Vertical
• C. Complete
• D. Horizontal and Vertical

Answer: (D)

Datums in land surveying establish the reference framework for where things are located and how high they are. There are horizontal datums, which anchor locations in a plane for plan coordinates, and vertical datums, which anchor elevations relative to a reference surface like mean sea level. Since a survey needs both position and height, both horizontal and vertical datums are used. The idea of a “complete” datum isn’t a standard category, so it isn’t applicable. In practice, you’ll see specific horizontal datums (like NAD83) paired with vertical datums (like NAVD88) to provide a full 3D reference.

Datums in land surveying establish the reference framework for where things are located and how high they are. There are horizontal datums, which anchor locations in a plane for plan coordinates, and vertical datums, which anchor elevations relative to a reference surface like mean sea level. Since a survey needs both position and height, both horizontal and vertical datums are used. The idea of a “complete” datum isn’t a standard category, so it isn’t applicable. In practice, you’ll see specific horizontal datums (like NAD83) paired with vertical datums (like NAVD88) to provide a full 3D reference.