What is the function of a Horizontal Angle in surveying?

The function of a Horizontal Angle in surveying is to determine the direction between lines. Horizontal angles are measured in a plane parallel to the earth's surface. This measurement is crucial for establishing the bearing or azimuth of a line in relation to another, allowing surveyors to accurately describe the direction of survey lines, set control points, and establish the layout of features in a project. Understanding horizontal angles is fundamental for creating accurate maps and plans, as they help define the spatial relationships between different elements of a project. Accurate direction measurement is essential in ensuring that construction and layout activities are performed as intended.