国家标准比例尺地形图说明(国外英文资料).docVIP

国家标准比例尺地形图说明(国外英文资料) Explanation of national standard scale topographic map There are seven basic scale topographic maps in our country: 1:100 million and 1:50 million and 1:25 million, 1:10 million, 1:5 million, 1:2.5 million Vanward 1:1; general map is usually divided into large and medium scale according to a Mistress: less than 1 million (small scale), 100 thousand to 1 million (in scale), more than 100 thousand (large scale). 1:100 million topographic map Sketch map of coverage of 1:100 000 topographic map The 1:100 million map reflects the natural geography and social economy of drawing within the scope for macroscopic evaluation and research of geographic information in a large range, is the need of the national departments of basic geographic information and the terrain elements of the platform, can be used as various departments to carry out overall planning for economic construction, economic layout, production layout, land the exploitation and utilization of resources and management plans to use a graph or map work, also can be used as a figure of national defense construction, but also can be used as a geographical map smaller scale general map of the basic information and thematic map. 1:100 000 topographic map by Conformal Conic Projection, map compilation method. The width and number are in the international 1:100 map. The division standard starts from the equator, the latitude is one column every 4 degrees, and the Latin letters A, B and C are used in turn...... V said it used to use Arabia figures 1, 2, and 3 in 1970s...... Said, the column number) preceded by N or S, the difference between the northern and southern hemisphere (China is located in the northern hemisphere, drawing No. N before all omitted); from 180 degrees of longitude from west to east 6 degrees as a global, divided into 60 longitudinal, followed by 1, 2. 3...... 60 means that the combination of column number line number is the number of the graph. Such as: J - 50, 10 - 50. 1:50 t