Scale Finder converts linear map scales to a representative fraction (and vice-versa). Question 5: Convert the following Representative Fraction (R.F. focal length is equal to 0.5 ft: which is analogous to a representative fraction of 1:2400. Answer: If a scale is 2 cm., to 1 km., calculate the R.F. ): An R.F. 4. A scale bar is typically a line marked like a ruler in units proportional to the map's scale, thus showing how a given distance on the map is equivalent to a distance in the real world. The fraction and the ratio mean the same thing: that one unit of distance on the map represents 253,440 of the same units on In a two-way grouping of map scales, when the numerical value of the representative fraction 1/x is larger than 1:500,000, the map is considered large scale; in a three-way grouping of map scales, when the numerical value of the Representative fraction (RF) or natural scale 1:1,000,000 (this is the same as 1/1,000,000) The RF says that 1 of any measurement on the map equals 1 million of the same measurement on the original surface; for the example above … The ratio of map distance to ground distance, both Learn vocabulary, terms, and more with flashcards, games, and other study tools. 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. Scale Finder 7 converts nearly over 180 distance units - both current and historical. (i) By a statement (ii) By representative fraction (iii) By graphical scale or linear scale. Representative Fraction: A method of scale of a map or plan expressed as a fraction showing the ratio between a unit distance on the map or plan, and the distance measured in the same units on the ground. This fraction is usually abbreviated as R. F. Thus, Representative Fraction (R.F.) 1:50000 can be shown as 1/50000 as well. Explanation of Representative Fraction Map scale is defined as the mathematical relationship between a unit of distance on the map and its corresponding distance on the ground. If necessary, invert the Representative Fraction (RF) for that purpose. RF scales is also a text based scale but no units are shown. If the scale is a representative fraction (and looks like 1/100,000), multiply the distance of the ruler by the denominator (100,000 in this Everything you always wanted to know Representative Fraction (RF) - Fractional Scale - Ratio Scale: 1:50000 represents the map scale as a mathematical ratio or fraction, thus the name ratio scale or fractional scale. Here are several examples: Scale Finder (Nigel James, Bodleian Library, Map Room). Because of this variation, the concept of scale becomes meaningful in two distinct ways. Almost all maps are drawn to a scale, so it should be possible for these maps to indicate what the scale of the map is. If a map has a scale (representative fraction, or RF) of 1:250,000, one inch on the map represents about how many miles on the earth's surface (round your answer to the nearest mile)? road junctions, buildings. "On this map the scale is given as a representative fraction (1/253,440) and also as a ratio (1:253,440). If we were to change the scale of the map such that the length of the section of road on the map was reduced to, say, 0.1 units in length, we would have created a smaller-scale map whose representative fraction is 0.1:100,000, or It can be expressed as 1/100,000 or 1:100,000. Representative fraction scale and ratio scale are basically the same. If your measurement on the map is 3 5/8 inches, that would be 3.63 miles on the ground. road maps, town plans. The scale of a map is the ratio of a distance on the map to the corresponding distance on the ground. Representative Fraction (RF) Scale The third method for showing scale is the representative fraction scale. Scale and Representative Fraction in a Toposheet or Topographic maps. This type of scale is sometimes confused with Representative Fraction (RF) scales. Handy calculators are available online. 6.2.3 Scale : 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. 1. (It could also be shown as l/50 000, but this form is not as common To obtain correct results, use appropriate units in the formula. Convert linear scales to representative fractions and vice In this case, the ratio existing between the length on the map and actual length on the ground is indicated by a fraction whose numerator is always 1. 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