ABSTRACT
One must o£en measure the area of enclosed regions on plan-size drawings. œese areas might be either regular or irregular in shape and describe one of the following:
• Areas enclosed by map contours • Cross section of the diastolic and systolic volumes of heart cavities • Farmland or forestland shown in aerial photographs • Cross sections of proposed and existing roads • Quantities of materials used in clothing manufacture • ScientiŸc measurements • Swimming pools • Quantities of ground cover
œe tools for this type of measurement include planimeters, digitizer-computer setups, digitizers with built-in area measuring capability, and grid overlay transparencies.
