What Is the Digit Ratio?

The 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 = ratio of distance on the graph to actual distance. There are three ways to represent scales: numerical scales, graphic scales, and text scales. Generally speaking, large-scale maps, with detailed content and high geometric accuracy, can be used for measurement on the map. A small-scale map has a strong generality and is not suitable for measurement on the map.

Maps are divided into three types: large-scale maps, medium-scale maps, and small-scale maps according to the scale. This is a classification method that is commonly used to distinguish map details, accuracy, and degree of problem solving. In view of the

The map scale is a measure of the reduction of the geographic entity's outline compared to the ground. To be precise, the ratio of the length of a straight line segment on the map to the corresponding straight line distance horizontal projection length on the ground is called the map scale.

Scale substance

The essence of the map scale is the enlargement and reduction of the earth and its related geographic elements. The scale at this time should be called the space scale. The scale has two essential meanings: the degree of abstraction (or detail); the ratio of distances. It is considered that the former affects the ability to understand spatial relationships, and the latter affects the expression of spatial data quality. The best connection between the two is "resolution", which is an index used to measure spatial data in digital form. On the map with paper as the carrier, the content of the map is selected. The degree of generalization and data accuracy are closely related to the scale. On a computer-generated screen map, the scale mainly indicates the accuracy of the map data. The change of the scale on the screen does not affect the characteristics of the scale of the map itself involved in the above content.

Scale effect

The role of scales in topographic maps is mainly as follows:

1. The essential mathematical foundation for measuring and using maps;

2. Reflect the measurement accuracy of the map;

3. Reflect the level of detail of the map content ^[1] .