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 scale is a simple ratio of map to ground measurement with a colon between the two measurements . 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." 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¦ ): An R.F. 1: 150 000 km b) km km c) 2. 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. 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. 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¦ 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:. 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. RF - Representative Fraction Scale of the map, 4. difficult to compare between different maps - it must be converted first . The RF is always written with the map distance as 1 and is independent of any unit of measure. Bar scales denote only the nominal or average map scale. Distance measured on the scale= 2.5 cm Ground distance= 10 miles= 10*1.6=, 4. fraction. ), it means that the R.F. The representative fraction scale presents the proportional relationship between map and ground distances in a different way. (It could be yards, meters, inches, and so forth. ) Convert linear scales to representative fractions and vice-versa. 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 scales can be compared â¦ Representative fractions may, therefore, specify map scale along a line at which deformation is minimal (nominal scale). 1: 250 000 km b) km km c) z 3. Here are several examples: Scale Finder (Nigel James, Bodleian Library, Map Room). 2. This scale is usually written as a fraction and is called the representative fraction. Representative Fraction (R.F. A representative fraction is the scale shown in a map as a ratio. Because an R.F. carries no units (inches, centimeters, etc. For example, a RF scale of 1 : 1,200 means that every one â¦ : 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. This provides 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¦ Map Scales - Representative Fraction Scales 1. Handy calculators are available online. Using the following scale, determine the length of the following line segments. 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