Map scale can be expressed as the ratio or proportion between a distance on a map and the actual distance on the land surface. This ratio is called the Representative Fraction (RF). A RF of 1:100,000 indicates that 1 unit of measure on the map represents 100,000 units on the land surface (i.e., 1 inch = 100,000 inches - 1.58 miles).
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The following information may be useful regarding map scales.