Define "Geodetic Datum."

A geodetic datum refers to a reference framework used for measuring geographical coordinates, which includes both horizontal and vertical positioning on the Earth’s surface. It provides the necessary reference points and surface upon which spatial data can be accurately placed. This framework allows for the consistent representation of the Earth’s shape and size, enabling accurate mapping, navigation, and geographic information system (GIS) applications.

In practical terms, a geodetic datum establishes the relationship between the real-world coordinates and their corresponding 3D positions in a defined coordinate system. This is crucial for transforming measurements from different surveys or data sources into a common context, ensuring that all measurements align correctly to provide coherent and reliable spatial information.

Understanding this concept is fundamental for geodetic engineers, as it underpins the accuracy and reliability of the measurements and calculations they perform in their work.