What is the gamma angle also known as in surveying?

The gamma angle, also known as the convergence angle, specifically refers to the angle that arises when mapping points from a spherical surface (like the Earth) onto a flat surface (like a map or construction site). In surveying, this angle accounts for the deviation from true north when considering the convergence of meridians as one moves away from the equator. This phenomenon is essential for accurately representing geospatial data and maintaining correct orientation in various surveying applications.

Understanding the convergence angle is crucial for surveyors as it impacts measurements and calculations related to distances and positioning on the Earth's surface. Proper adjustment for the gamma angle ensures that surveying results remain precise, especially in large-scale operations or in areas where the curvature of the Earth must be accounted for.