Question 4: Convert the following scales into R.F. (i) By a statement (ii) By representative fraction (iii) By graphical scale or linear scale. The representative fraction of a map scale is 1:50,000. This type of scale is sometimes confused with Representative Fraction (RF) scales. To obtain correct results, use appropriate units in the formula. Answer: If a scale is 2 cm., to 1 km., calculate the R.F. 2. Here are several examples: Scale Finder (Nigel James, Bodleian Library, Map Room). 1. Map scales may be expressed in words (a lexical scale), as a ratio, or as a fraction. Words & Numbers Map Scale A ratio or representative fraction (RF) indicates how many units on Earth's surface are equal to one unit on the map. Learn basic calculations concerning the scale in maps: how to calculate the distance in reality from the distance on the map, and vice versa. [7] There are many different forms of scale bar which vary from a simple box of a set length to more detailed bars with smaller divisions, allowing for more precise measuring. 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 RF scales is also a text based scale but no units are shown. "On this map the scale is given as a representative fraction (1/253,440) and also as a ratio (1:253,440). 4. road maps, town plans. 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. 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 … Representative fraction scale and ratio scale are basically the same. There are three primary ways to indicate scale on a map: a representative fraction (e.g., 1:24,000), a verbal Question 5: Convert the following An example: on a map with the scale 1:20000, 3 centimeters accord to 0.6 Representative fraction scale (RF): Two other terms refer to the representative fraction scale - the fractional 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. Learn vocabulary, terms, and more with flashcards, games, and other study tools. 1) Suppose I have a map with a scale of 1:50,000. (It could also be shown as l/50 000, but this form is not as common Please enter two values, the third will be calculated. A ratio or representative fraction using ratios to measure and calculate distances 2. If your measurement on the map is 3 5/8 inches, that would be 3.63 miles on the ground. The scale is a simple ratio of map to ground measurement with a colon between the two measurements . In this example, 1 centimeter on 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 How to Calculate the Scale of an Aerial Photograph Measure the distance between two distinct features Hints • The two features must appear on both the map and aerial photograph.• Use human features eg. Representative fraction - Topic:GIS - Online Encyclopedia - What is what? The ratio of map distance to ground distance, both A word statement that states the conversion of base units and is also a description of a map … 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. Glossary not to be It can be expressed as 1/100,000 or 1:100,000. An RF is a ratio and is shown as follows: 1:50 000. The scale ratio is always written as one unit on the photo or map to the corresponding number of units on the ground. Scale Calculator By ScaleCalculator.com you can easily calculate model size or model scale.You can also calculate map scale, distance on map and distance in real life on Map Scale Calculator page Handy calculators are available online. This provides the representative fraction. Definition of representative fraction. The scale of a map is the ratio of a distance on the map to the corresponding distance on the ground. 6.2.3 Scale 6.2.2.2 Representative Fraction This same situation can be utilized to calculate representative fraction, keeping in mind that a 6-in. Scale Finder converts linear map scales to a representative fraction (and vice-versa). This simple concept is complicated by the curvature of the Earth's surface, which forces scale to vary across a map. Scale and Representative Fraction in a Toposheet or Topographic maps. If necessary, invert the Representative Fraction (RF) for that purpose. 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 1:50000 can be shown as 1/50000 as well. They both mean that 1cm on the map represents 50 000cm on the ground. 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)? ): An R.F. focal length is equal to 0.5 ft: which is analogous to a representative fraction of 1:2400. 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. Map Scale and Distance Calculator Calculate scale, distance on the map or real distance on Earth. Examples are: 'one centimetre to one hundred metres' or 1:10,000 or … If a distance on the map is measured as 6.5 inches, what is the true distance (in inches) on Earth's surface? Convert linear scales to representative fractions and vice show the most detail but only cover a small area e.g. 50,000 … road junctions, buildings. It is an invaluable tool for map cataloguers and users and is free to download and use. 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