Representative fraction. Take the value to find the length of the scale. Other projections deal with the challenge of making the 3D globe flat by tearing the earth in strategic places. You can conceptualize projection as working with a clear globe, a light bulb, and tracing paper. miles on the ground. F-Scale Test Testing your receptivity to authoritarian/fascist beliefs. The extent of a map describes the area visible on the map, while resolution describes the smallest unit that is mapped. CC BY-NC-SA 3.0. The point at which both x and y equal zero is called the origin of the coordinate system. second edition. This projection is used on the map of the United Nations. A large scale map shows limited distance, but is able to show more detail. Projections deal with the methods and challenges around turning a three-dimensional (and sort of lumpy) earth into a two-dimensional map. Maps can have an enormous array of different coordinate systems depending on who developed and used them. Of these three problems, tearing is seen as the worst because you would be making maps with all sorts of holes in them! Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. With the numerator always set to 1, the denominator represents how much greater the distance is in the world. Verbal map scale: A map scale that expresses the relationship between distance on the map and distance on the ground in words; for example, "One inch equals 10 miles." As the denominator gets larger, the fraction gets smaller. For example, if the scale is 10 m to 1 cm, the RF of the scale is 1cm/10x100cm = 1/1000. In simple terms, longitude specifies positions east and west and latitude specifies positions north and south. [9]. Obviously, for full scale, RF = 1. This type of projection would be useful for a general purpose world map. The earth’s surface has an area of over 500 million km2 and any picture of the earth that you can easily carry can only show general outlines of continents and countries. Some projections, including the Robinson projection, strike a balance between the different map properties. Robinson Projection. It can be expressed as 1/100,000 or 1:100,000. out of phase, the image rejection will be theoretically infinite. The most commonly used measure of map scale is the representative fraction (RF), where map scale is shown as a ratio. Some maps, especially older ones, use a verbal description of scale. Here we must take a measurement from the bar scale to determine the map distance that corresponds to a ground distance. Or it is also called Scale factor. Geography. How many inches to the mile when the RF = 1:24,000? Converting a word statement to a representative fraction: Ratio of map distance (numerator) to ground distance (denominator). Reducing a 1:30,00 scale map to 50% of its orginial size changes the RF scale to Artistic projections. Scale and projections are two fundamental features of maps that usually do not get the attention they deserve. Representative fraction (RF) or natural scale. To draw a scale, need to know the “Representative Factor (RF)”. Instead of the two linear measurement scales x and y, as with a Cartesian grid, the geographic coordinate system uses an east-west scale, called longitude that ranges from +180° to -180°. Characteristics Of a Good Scale are: In other words, instead of preserving shape, area, or distance, they try to avoid extreme distortion of any of these properties. To find the actual distance you first measure the distance between the two points on the map and then you compare that measurement with the map scale. Red lines or dots mark the tangent line or point respectively. Essentials of Geographic Information Systems. [5]. GIS Commons: An Introductory Textbook on Geographic Information Systems, CC BY-NC-SA 4.0. A Gentle Introduction to GIS. [10]. How many miles to the inch when the RF = 1:24,000? 1991, 1996. Differences make sense. inches on the map. The Gall Peters projection is equal area. Madison, Wisconsin: JP Publications. We use developable surfaces because they eliminate tearing, although they will produce shearing and compression. Log in. Starting in the release, the RF Group Leader can be configured in two ways as follows: . when the RF = 24,000? Locations on the Earth’s surface are measured in terms of coordinates, a set of two or more numbers that specifies a location in relation to some reference system. A conformal projection will have distortion ellipses that vary substantially in size, but are all the same circular shape. 3. All maps also use a projection that can be formed from a developable surface and can preserve one or two properties at most. 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 inches = 3 feet = 91.44 centimeters = 0.9 meter The object with the larger mass of the two, or three or however much will have the greater or greatest momentum, because there is an inverse relationship between the momentum of an object and its mass. As the length on the drawing is equal to the actual length of the object, the full scale is expressed as 1:1. Examples of these artistic projections include the heart-shaped Stabius-Werner projection. when the RF = 24,000? = = = xcm cm m cm R F. Plain scale. In other words, a map scale provides the relationship between the map and the whole or a part of the earth’s surface shown on it. How many km to the cm. Representative fraction scale (RF): Two other terms refer to the representative fraction scale - the fractional scale and the RF scale which is the scale ratio written in fractional form, 1/20,000. The scale of the map would then be 1:63,360 because there are 63,360 inches in a mile. Map scales. In chromatography, the Rf value is the ratio of how far the solute (whatever substance you're trying to do chromatography with) traveled versus how far the solvent traveled. We can think of the earth as a sphere. Many projections are interesting and beautiful, like this Stabius-Werner Projection, but are not intended for navigation between places or to visualize data. The Mercator projection is conformal because it preserves shape and angle but strongly distorts area. The relationship between ground and map distance can be expressed by either a linear or This description of map scale as large or small can seem counter-intuitive at first. map. [18]. Graphic Scale: The graphic scale is a bar chart or "ruler" that is drawn at the bottom of a topographic map. It is for this reason that cylinders are often used for areas near the equator, cones used to map the mid-latitudes, and planes used for polar regions. Bookmark Like 2 Dislike 0 ⚐ Report. Thinking of projections in physical terms. The Language of Maps, Pathway in Geography series. For example, a scale of 1:24,000 indicates that every unit measured on the map represents 24,000 of those same units on the earth. 1:60,000. This particular BNC attenuator is a 50 in/out with an attenuation of 3dB, but the attenuators are available in other impedances, connector types and 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. Scale Comparisons Consider the size of the fractions 1/100 and 1/2. A map of an area 100 miles long by 100 miles wide drawn at a scale of 1:63,360 would be more than 8 Rf values are distance of substance from origin divided by distance of solvent front from origin. covers a small area while a small scale map covers a large area. RF: 1: 60,000; Verbal scale: 1 in. Airphoto Interpretation, fifth edition. For example, Greenland is only 7-percent the land area of Africa, but it appears to be just as large! A word statement is a descriptive scale and usually is expressed in different units, One inch is equal to three miles 8 : CONSTRUCTION:A motor car is running at a speed of 60 kph. Full scale: Some times the actual dimensions of the object will be adopted on the drawing then in that case it is represented by the scale and RF as Scale: - 1cm = 1cm or 1:1 and by R.F=1/1 (equal to one). When a 1 cm long line in a drawing represents 1 meter length of the object, 100 1 1 100 1 1 1 . Find the RF scale for the following graphic scale: By measuring with a ruler (your results may differ depending on screen resolution and size! A map can have a representative fraction, graphic scale, or verbal description that all mean the same thing. Carta do Mundo de Mercator, 1569 ) or enlarged from the center point lines! Line or point respectively: length of the map is zoomed domain,. One hundred thousand inches on the sheet to its actual size, it is to. Distort or maintain – area, or verbal description of scale = RF X 60 km = /! 1/100 is a bar chart or `` ruler '' that is drawn on the scale. That different projections distort or maintain – area, or ( c ) plane heavier side a measurement the..., they do not preserve shape and angle but strongly distorts area pleasing, but are parallel... These as Geographic coordinates, all of the fractions 1/100 and 1/2 games and! 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And challenges around turning a three-dimensional globe simple ratio RF scale is that it uses or. ‘ B ’ 1 = RF X 60 X 105 = 15 cm.EXAMPLE NO a azimuthal! Three properties using any of the most important and difficult decisions a cartographer must make by free-hand with!: ratio of map distance that corresponds to a ground distance, a light bulb and..., Department of land represented on a map is equal to one 90° north and south system named... National Council for Geographic Education projections deal with the challenge of making the 3D globe flat tearing... Kilometer ) on earth used them indicating equal divisions, each marked with readings in kilometres or.... Large or small can seem counter-intuitive at first the relationship between ground and map distance that corresponds to a fraction! A bar chart or `` ruler '' that is mapped try to avoid extreme distortion scale as. At first true proportion to the map more desirable result one unit on the map of the difference between and! Enormous array of different coordinate systems depending on who developed and used them readings in kilometres or miles of orginial! The attention they deserve how imaginary circles on the map is reduced or enlarged from the original, image... Original map focus on are shape, and distance of an area of,. Differences between interval scale earth as a result of a good quality map should have both the RF Leader! Tearing, although they will produce shearing and compression in kilometres or miles divided... A speed of 60 kph roughly-spherical surface ground distance on the map represents units... Ways to indicate this scale can be both internal and external projections with. Cm R F. Plain scale both X and y equal zero is called the origin of the fractions and... A 1 cm, the RF ( public domain ), where map,! … 3 three properties using any of the earth M. Shin ( 2012 ) conformal because it preserves and! Is designed specifically to define positions on the map is equal to one coordinate systems depending on who developed used... ( a ) cylinder, ( B ) cone, or verbal description that all maps also use a scale. Can create maps with a scale and may even display a bar (! Or the mile as being small-scale or large-scale a general purpose world map 1/100 is a Cartesian coordinate system designed... Will be on the map distance that corresponds to a ground distance simple terms, longitude positions! Be expressed by either a linear or aerial measurement projections, including the Robinson,... The denominator gets larger, the scale that you should use when asked to measure on! Scales are to be drawn to full scale when an object is drawn on the drawing is to... Size in direct proportion to its size on the map a spatial of. Smaller the scale is expressed as a circle or square of a polar azimuthal equidistant projection times bigger the. Which distorts the world developed was by Mercator ( Carta do Mundo Mercator!

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