scale is a ratio, or fraction, that expresses the mathematical relationship between MAP and LAND, such as 1 : 24,000. which means "1 map unit is equivalent to 24,000 land units." Because an R.F. The continental United States depicted on a 62-inches wide wall map, has a representative fraction scale of 1:3,000,000. For example, a RF scale of 1 : 1,200 means that every one â¦ This type of scale is sometimes confused with Representative Fraction (RF) scales. scales can be compared â¦ Handy calculators are available online. (It could be yards, meters, inches, and so forth. ) 1: 250 000 km b) km km c) z 3. is equal to 50000 of the same unit on the ground. Using the following scale, determine the length of the following line segments. This provides the representative fraction. A representative ratio of 500,000:1 shown on a map means that one unit of distance in the map equals 500,000 units of distance on â¦ Bar scales denote only the nominal or average map scale. These "representative fraction" scales mean that one unit of measurement on the map 1 inch or 1 centimeter represents 10,000 of the same units on the ground. ): An R.F. Converting Lexical Scale "1 inch represents 3.9 miles" to Representative Fraction (RF) and Ratio: First, I write the lexical scale as a fraction - 1 inch (on the map) / 3.9 miles (on the ground), then I convert the length unit mile to inches because the RF shows how many inches on the ground are represented by 1 inch on a map. Common Length and Distance Conversions ; Length or Distance Converter Variable scales, like the one illustrated above right, show how scale varies, in this case by latitude, due to deformation caused by map projection. 1 inch (in) = 2.54 centimeters 1 centimeter (cm) = 0.39 inch 1 foot (ft) = 12 inches = 30.5 centimeters = 0.3 meter 1 yard (yd) = 36 â¦ The first example at the right shows that earlier version â¦ ), it means that the R.F. 1: 150 000 km b) km km c) 2. Representative Fraction (R.F. Representative fractions may, therefore, specify map scale along a line at which deformation is minimal (nominal scale). The representative fraction scale presents the proportional relationship between map and ground distances in a different way. If the scale were 1:63,360, for instance, then 1 inch on the map would represent 63,360 inches or 1 mile on the An RF of 1/50,000 or 1:50,000 means that one unit of measure on the map is equal to 50,000 units of â¦ Definition of representative fraction. A representative fraction is the scale shown in a map as a ratio. This scale is usually written as a fraction and is called the representative fraction. Showing the entire world on a wall map that is 59.5 inches wide results in a representative fraction scale of â¦ Here are several examples: Scale Finder (Nigel James, Bodleian Library, Map Room). Even its name is deceptive, although during the first part of the twentieth century this type of scale was actually written on USGS maps as a fraction. 2. The scale is a simple ratio of map to ground measurement with a colon between the two measurements . Distance measured on the scale= 2.5 cm Ground distance= 10 miles= 10*1.6=, 4. fraction. RF scales is also a text based scale but no units are shown. : a map scale in which figures representing units (as centimeters, inches, or feet) are expressed in the form of the fraction 1/x (as 1/250,000) or of the ratio 1:x to indicate that one unit on the map represents x units (as 250,000 centimeters) on the earth's surface. Converting Between Scale Types of Historic and Topographic Maps, page 1 Converting Bar Scale to Representative Fraction (RF)/Ratio Scale English and Metric Measures of Length to use:. Map Scales - Representative Fraction Scales 1. Using the following scale, determine the length of the following line segments. 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