Digital Elevation Model (DEM) records topographic fluctuation changes and in which it contains various topographic construct information including valley lines and ridge lines.
数字高程模型(dem)是记录地形起伏变化的资料，当中蕴含着各种地形地貌的结构信息，其中包括山谷线和山脊线。
And it has been widely applied in digital city, topographic mapping, geographic information system, medical engineering, preservation of cultural relics and robotic navigation.
广泛地应用于数字城市、地形测绘、地理信息系统、医学工程、文物保护、机器人导航等各个行业。
The design and development of the topographic data extraction information system based on non-metric digital imagery.
基于非量测数码影像的地形数据采集信息系统设计与开发。
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