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Introduction to Marine Engineering

Subsubsection Instruments Used to Measure Area

Although ordinary length measuring tools can be used for measuring the dimensions of a shape, which can then be used to calculate the area of simple geometric shapes, there are some tools which can measure area directly.
A Planimeter is a mechanical device used to measure the area of irregular shapes on a map or plan. It works by tracing the outline of the shape, and the device calculates the area based on the movement of its components.
Figure 2.2.15. Planimeter
Geographic Information Systems (GIS) are software which can analyze and measure areas of land, often for mapping purposes. These software applications can measure the area of polygons drawn on digital maps with high precision.
Figure 2.2.16. Geographic Information System (GIS)