Scale
Maps are made to scale. In each case, the scale represents the ratio of a distance on the map to the actual distance on the ground. in other words it is the ratio of the distance between any two points on the map to corresponding distance between those points on the earth’s surface.
Scale can be presented in a several ways such as RF scale, statement scale and graphical scale of bar scale. For example, if map scale is 1:10,000; it means that 1cm distance on the map corresponds to 10,000 cm on the ground. This kind of scale is known as RF scale RF scale can be converted any to any system of measurements but during enlargement and reduction it creates problems.The unit of scale is clearly is clearly written in statements scale. For example, if the statement scale is 1cm=100 meters in the map, it shows that the 1 cm distances in map represents 100 meter on the earth surface. The graphical scale is easy to understand. The given distance in the scale corresponds to the same distance in the map. Thus, it has great advantages while reducing or enlarging a map.
A map can be large scale or a small scale. Larger the denominator, the smaller will be the scale and smaller the denominator, larger will be the scale. Maps can be accurately enlarged or reduced either by instruments or by graphical methods and this would involve change in both size and scale. Map scale is does not enlarge or reduce while enlarging or reducing the map with RF scale and statement scale.
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