Calculation method of graphic scale: distance on map = actual distance × scale; Actual distance = distance on the map ÷ scale; Proportion = distance on the map ÷ actual distance. Pay attention to the conversion between units when calculating the proportion. 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.

Proportional representation method:

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.

The role of scale in topographic map;

1, the necessary mathematical basis for mapping and using maps;

2. Reflect the measurement accuracy of the map;

3. Reflect the details of the map content.

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