求翻译：在传统的地形图中，是用符号、必要的数字注记表示地物、地貌的位置、形状及特征。是将地面上的信息用图形与注记的方式表示在图纸上，优点在于直观，便于人工使用。但是，随着计算机技术和信息处理的飞速发展，纸质地图己不能满足工程设计、施工的自动化、数字化的要求¨J。而数字高程模型实现了区域地形表面的数字化表达，是新一代的地形图，它实现了地形从二维表达向三维表达的转引，因此，对数字高程模型(DEM)建立的方法、应用的探讨与研究是十分必要。是什么意思？

Traditional topographic maps, symbols, said surface features, landscape position, shape and characteristics of the necessary digital annotation. On the ground information graphics and annotation on the drawings, the advantage of intuitive, easy manual use. However, with the rapid development of comp

In the traditional topographic maps, with the symbol is needed, the digital note that geometry, geography of the location, shape and features. Is the information on the ground in a graphical way to indicate that the note on the drawing, the advantage is that an intuitive and easy to use manual. Howe

In the traditional topographic diagram, is with the mark, the essential digital note records the expression thing, the landform position, the shape and the characteristic.Is the ground in information the way expression which records with the graph and the note on the blueprint, the merit lies in int

In traditional topographic maps is the use of symbols, the necessary number of notes indicates an object, location, shape and characteristic. Is graphic and information notes on the ground expressed in drawings and advantage of intuitive, easy to use artificial. However, with the rapid development o

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