What are the two main types of geodetic surveys?

The classification of geodetic surveys into absolute and relative surveys is an important concept in geodesy. Absolute surveys provide the exact position of a point in relation to a specific frame of reference, often based on fixed geodetic networks and control points. They are essential for establishing a definitive location that can be universally applied or referenced.

On the other hand, relative surveys focus on the position of points in relation to one another. This type of survey is more about the measurements and angles between points rather than their absolute positions. This can be particularly useful in applications where the location of a new point in relation to existing ones is sufficient.

Understanding this distinction is crucial for geodetic engineers as it guides the methodology and technology they employ depending on the goals of a survey. Each type serves different purposes in the field of geodesy and has its own set of methods and tools that can be applied effectively. The chosen approach influences factors such as precision, accuracy, and ultimately the reliability of the data collected.