The formula is: scale = the ratio of the distance on the map to the actual distance.
The length of a drawing somewhere is 3 cm, and the actual length is 3×200=600 cm, which is 6 meters.
This scale is a reduced scale, which is often used in maps and civil engineering drawings.
There is also a magnification ratio, such as 100: 1, which means 100 mm and 1 mm on the drawing.
The scale is divided into enlargement scale and reduction scale, so as to draw drawings more conveniently.
Maps and large drawings in civil engineering are simplified into drawings, which is convenient for drawing.
Small mechanical parts can be seen clearly and read easily when magnified to the drawing.
The general purpose is to enlarge or reduce the actual situation and draw it on the map for easy reading.
Extended data:
Scale is the ratio of the length of a line segment on the map to the actual length of the corresponding line segment on the ground.
The formula is: scale = the ratio of the distance on the map to the actual distance.
There are three ways to express scale: numerical scale, graphic scale and text scale. 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.
Expressed by the formula: scale = distance on the map/actual distance. There are usually three representations of scales.
1, a number (also known as digital scale), and the scale size is expressed by a numerical scale or fractional formula. For example:1:50,000,000 or1/50,000,000.
2. Linetype (also called scale): draw a line on the map and indicate the actual distance represented by 1 cm on the map.
3. Text-based method: directly write 1 cm on the map to indicate how many meters of field distance, for example, 1 cm on the map is equivalent to 500 meters, or one in 50,000.
These three representations are interchangeable. Must be converted to units.
When drawing a plan such as a map, it is necessary to reduce (or expand) the actual distance according to a certain proportion before drawing it on the drawing. At this time, it is necessary to determine the ratio of the distance on the map to the corresponding actual distance. The ratio of the distance on a picture to the actual distance is called the scale of this picture.
Proportional formula:
Map distance = actual distance × scale
Actual distance = distance on map/scale.
Proportion = distance on the map ÷ actual distance. (Pay attention to the conversion between units in proportion calculation)
( 1km = 1km = 1x 1000m = 1x 100000cm)
Unit conversion: centimeters on the map, kilometers on the spot, centimeters for kilometers, and five zeros; Kilometers represent centimeters, and two zeros are added to thousands.
Baidu Encyclopedia-Scale