What is the primary use of a planimeter in surveying?

The primary use of a planimeter in surveying is to measure the area of shapes on maps. This instrument is particularly valuable for determining the area of irregularly shaped plots, which can be challenging to calculate mathematically using standard geometric formulas. By tracing the perimeter of a shape on a map, the planimeter computes the area enclosed, providing surveyors with accurate measurements essential for various applications, including land development, environmental assessments, and resource management.

The design of the planimeter, which typically employs a pivoting arm and a distance measuring mechanism, allows it to effectively translate the physical shape into an area measurement, making it a practical tool in both field and office settings. This application is fundamental in geodetic engineering, where precise area estimations are crucial for planning and decision-making processes.