What are geodetic control points?

Geodetic control points are defined as points with precise locations established for geodetic measurements. These points are critical in geodesy, which is the science of measuring and understanding the Earth's geometric shape, orientation in space, and gravity field. The precision of geodetic control points allows for accurate positioning and mapping, making them essential for tasks like surveying, navigation, and the establishment of geographic information systems (GIS).

These points are carefully surveyed and their coordinates are known to a high degree of accuracy, often using techniques like Global Positioning System (GPS) or traditional triangulation methods. Because they serve as reference points for establishing the location of other features and for linking local surveys to national or global frameworks, they play a crucial role in ensuring that all measurements taken in the field are consistent and comparable.

In contrast, temporary markers, points with approximate locations, and locations for geological surveys do not provide the same level of accuracy or are intended for different purposes altogether, which is why they do not fit the definition of geodetic control points.