地图数字化（Map digitization）.doc

地图数字化（Map digitization） We usually have two sets of topographic map schemas: 1:500 1:1000 1:2000 topographic map schema I. 1:5000 1:10000 topographic map schema II The two map type basic content of similar results, the provisions of the different topographic map represents various features, landscape elements symbols, annotations and decoration standards, and the use of symbols, principles, methods and requirements. Its just a little bit different in the size and requirements of some symbols. A symbol size The numbers beside the sign are marked in millimeters. Line segments represented by dotted lines, where the size is not specified, the actual part is 2.0mm, and the imaginary part is 1.0mm. (I) The positioning points and location lines of the B symbols Having a point in the figure; the point is the central location of the object. (II) A geometric symbol, such as a circle, rectangle, or triangle, at the center of its figure. Wide bottom symbol (Mongolia package, chimney, water tower, independent stone) at the bottom line center. A rectangular symbol at the bottom (windmill, landmark, tree, etc) at the right angle. Several graphics composed of symbols (meteorological station, Oboo, church, radar, radio mast, etc.) at the center point below the graph or cross point. Is not the bottom line symbols (kiln, pavilion, cave, etc.) according to the scale representation of the positioning points at both ends point (I); non scale representation of the location center in the lower part between the end points of the. Linear symbols (roads, rivers and embankments, etc., according to the scale of state) said, on both sides of the center line (I); non scale, the center line symbol. The direction and configuration of the C symbol The independence of the symbol according to the specified direction except that really a brief explanation, the other are perpendicular to the NaNTU profile picture. The configuration of soil and vegetation symbols is as follows: Arranged in rows, such as