1, scale

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.

2. Myth; legend

Legend is concentrated in the corner or side of the map. It is helpful to better understand the map by describing the contents and indicators represented by various symbols and colors on the map. It has a dual task, as a standard for graphic representation of map content in drawing and as a necessary reading guide in drawing. Legend should conform to the principles of integrity and consistency.

3. Pointer

Pointing markers are directional tools on maps, pointing north at the top of the markers. Determining the direction of space objects on the map is called map orientation, which is often oriented with signs such as longitude or latitude, three-north direction map and direction arrow as the standard direction.

Extended data:

Map elements:

1, graphic element

It is the content expressed by the map according to the requirements of drawing. Including notes and geoscience foundation.

2. Mathematical elements

It is used to determine the spatial correlation position of geoscience elements and plays the role of "skeleton" of map content.

3. Auxiliary elements

Explain the present situation of map compilation and the contents that must be provided for the convenience of map application.

4. Supplementary explanation

In the form of maps, statistical charts, profiles, photos, words, etc. The theme map is supplemented in content and form. It can be arranged in an appropriate position on the main map as required.