What is the function of a planimeter in surveying?

The function of a planimeter in surveying is to measure areas by tracing outlines. A planimeter is a tool designed specifically for the purpose of calculating the area of a two-dimensional shape on a map or a drawing by tracing its perimeter. This device operates by having a pivot point that moves along the traced outline, allowing it to accurately determine the area enclosed within the boundaries being measured.

In the context of surveying, this capability is particularly important for quantifying land areas and understanding the dimensions of plots or geographic features. By providing a means to easily determine the area without manual calculation or complex formulae, planimeters are valuable instruments in various applications such as land surveying, cartography, and engineering projects.

Other options relate to different surveying functions, but they do not align with the specific role of a planimeter. Measuring distances typically involves tools like tapes or electronic distance measurement devices, while creating digital maps and analyzing geospatial data involve different technological processes such as geographic information systems (GIS) or other mapping software rather than the mechanical function of a planimeter.