The map is a graph depicting the natural geography, administrative region, and social condition of the earth's surface by using lines, symbols, colors, and text notes in a certain proportion. With the advancement of science and technology, the concept of maps is constantly evolving. For example, maps are regarded as “images and symbolic models that reflect natural and social phenomena”. Maps are “carriers of spatial information” and “transmission channels for spatial information”. Wait. Ancient maps are usually painted on parchment or slate. The traditional maps are mostly paper. With the development of technology, electronic maps and other carriers have emerged. The map is based on a certain drawing rule, using the drawing method, through the mapping synthesis on a certain carrier, expressing the spatial distribution of the various things on the earth (or other celestial bodies), the connection and the state of development and change in time.