What is the primary purpose of using a datum in surveying?

The primary purpose of using a datum in surveying is to establish elevation points. A datum serves as a reference point or level from which measurements are taken. In surveying, it provides a consistent baseline for determining the vertical position of points in relation to sea level or another reference point. This is essential for construction projects, topographic mapping, and any work that requires a clear understanding of heights and elevations, ensuring that structures are built accurately and that any land features are correctly represented in terms of slope, drainage, and other critical factors.

In this context, datums are fundamental to ensuring all measurements are comparable and can be reliably used in various applications, such as engineering and environmental assessments.