The traditional concept of the map is in accordance with certain mathematical rules of the schema with the provisions of symbols and colors, the earth's surface the natural and social phenomenon, the selective reduction in the floor plan drawn map on paper. Such as general maps, thematic maps, topographic maps of various scales, image maps, three-dimensional maps. Modern map has appeared microfilm maps, digital maps, electronic maps, such as new varieties of holographic photograph.
         The state's basic topographic maps that the state's basic-scale topographic maps, referred to as the state's basic plan. It is enacted in accordance with national norms of the unity of measurement, pattern and scale series mapping or compilation of topographic maps from the country's economic construction, national defense construction and military operations with the basic plan, but also the basis for the preparation of other maps. National-scale topographic map series are not consistent, the provisions of China's 1:1 million, 1:2.5 million and 1:5 million and 1:10 million and 1:20 million (now for the 1:25 million), 1:50 million , 1:100 scale topographic map万七species of the state's basic-scale topographic maps. The accuracy of the measurement system and the quality of mapping is a measure of the number of mapping a country's level of development of science and technology one of the important symbols.