What is the purpose of differential leveling in surveying?

The purpose of differential leveling in surveying is to determine differences in elevation between points. This technique is critical for establishing how high or low one point is relative to another, which is essential for various applications in construction, engineering, and land development. By using a leveling instrument and a benchmark, surveyors can accurately measure vertical distances to ensure that structures are built at the correct elevation and to manage drainage or landscaping projects effectively. This method provides precise measurements that help in achieving the desired topography and ensuring that projects meet design specifications.

Other options, such as measuring angles between points, establishing terrain curvature, or mapping the survey area, involve different methodologies and objectives that do not specifically pertain to the elevation measurement focus of differential leveling.