Scale is proportion. The larger the denominator, the smaller the scale, and the smaller the denominator, the larger the scale.
The key point of scale is that only by mastering the scale can we calculate the distance between the map and the reality, so that the map can really play its role.
The difficulty lies in the contrast of size. Because the scale is actually a fractional formula, the larger the denominator, the smaller the scale. However, because of the three forms of scales, except the standard fractional formula, the other two are not clear at a glance, which is still a bit difficult for students with weak mathematical foundation.
The concept of scale
Scale is the ratio of the length of a line segment on the map to the distance of the corresponding line on the ground. The formula is: scale = distance on the map/actual distance, which can be expressed in three ways: numerical scale, graphic scale and text scale.
Scale can be used in mapping, cartography, geographic information synthesis and other scenes. In addition, scale also means a description of the accuracy and details of the map.
In order to meet the needs of economic construction and national defense construction, topographic maps with different scales need to be mapped and compiled. Generally speaking, 1: 1 10,000,1:500,000 and1:200,000 are small-scale topographic maps; 1:50,000 and1:25,000 are medium-scale topographic maps; 1: 10000, 1:5000, 1:2000, 1: 1000 and 1:500 are large-scale topographic maps.
Generally speaking, large-scale maps, with detailed contents and high geometric accuracy, can be used for mapping on maps. Small-scale maps are universal and not suitable for surveying and mapping. The selection of drawing scale should be based on the accuracy required by engineering planning and construction practice.