Common Length and Distance Conversions ; Length or Distance Converter This scale is usually written as a fraction and is called the representative fraction. 1: 150 000 km b) km km c) 2. Variable scales, like the one illustrated above right, show how scale varies, in this case by latitude, due to deformation caused by map projection. 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 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 ⦠The representative fraction scale presents the proportional relationship between map and ground distances in a different way. 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. Definition of representative fraction. 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 ⦠The continental United States depicted on a 62-inches wide wall map, has a representative fraction scale of 1:3,000,000. scales can be compared ⦠The first example at the right shows that earlier version ⦠Representative fractions may, therefore, specify map scale along a line at which deformation is minimal (nominal scale). 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 ⦠For example, a RF scale of 1 : 1,200 means that every one ⦠is equal to 50000 of the same unit on the ground. 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:. Representative Fraction (R.F. Handy calculators are available online. 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. A representative fraction is the scale shown in a map as a ratio. Because an R.F. 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. : 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. Here are several examples: Scale Finder (Nigel James, Bodleian Library, Map Room). 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." This type of scale is sometimes confused with Representative Fraction (RF) scales. 1: 250 000 km b) km km c) z 3. Showing the entire world on a wall map that is 59.5 inches wide results in a representative fraction scale of ⦠Bar scales denote only the nominal or average map scale. ), it means that the R.F. ): An R.F. Using the following scale, determine the length of the following line segments. RF - Representative Fraction Scale of the map, 4. difficult to compare between different maps - it must be converted first . 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. (It could be yards, meters, inches, and so forth. ) 2. carries no units (inches, centimeters, etc. RF scales is also a text based scale but no units are shown. Map Scales - Representative Fraction Scales 1. This provides the representative fraction. Convert linear scales to representative fractions and vice-versa. The RF is always written with the map distance as 1 and is independent of any unit of measure. Using the following scale, determine the length of the following line segments. 2.5 cm ground distance= 10 miles= 10 * 1.6=, 4. fraction type scale... Of 1:3,000,000 as 1 and is independent of any unit of measure right shows that earlier version ⦠of...: scale Finder ( Nigel James, Bodleian Library, map Room ) at! Distance= 10 miles= 10 * 1.6=, 4. fraction ) z 3,,... 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