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:

1, distance on map = actual distance × scale.

2, the actual distance = distance on the map/scale.

3. Proportion = distance on the map ÷ actual distance. (Pay attention to the conversion between units when calculating the proportion) (1km =1km =1x10000 cm =1x10000 cm).

4. Unit conversion: centimeter on the map, kilometer on the spot, centimeter on the kilometer, and five zeros; Kilometers represent centimeters, and two zeros are added to thousands.

Proportional representation:

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.

Extended data:

How to use the scale:

1, according to the scale on the map, you can measure the field distance between the two places on the map; According to the actual distance and scale of the two places, the distance between the two places on the map can be calculated; According to the distance on the map and the actual distance between the two places, the scale can be calculated.

2. According to the purpose of the map, the size of the area, the size of the map sheet and the details of the content, the scale to be drawn is large or small. The numerator in the map scale is usually 1, and the larger the denominator, the smaller the scale.

3. Generally, a map with a scale greater than1100000 is called a large-scale map; A map with a scale of1:100000 to1:100000 is called a medium-scale map; A map with a scale less than one millionth is called a small-scale map.

4. On the same Tu Tu map, the larger the scale, the smaller the scope of map representation, the more detailed the content of map representation, and the higher the accuracy; The smaller the scale, the larger the range represented on the map, the simpler the content reflected and the lower the accuracy. Most of the geography textbooks and maps in the map set used by middle school students belong to reduced scale maps.

2. The distance on the map divided by the actual distance is equal to the scale, and the formula is the distance on the map: actual distance = scale. For example, 2cm on the map represents the actual 300km, so you can find the scale as follows: 2cm: 300km = 2cm: 30000000cm = 1: 1500000, and you can get it.

Baidu Encyclopedia-Scale