However, the features of topographic information of these DEMs have not been clarified.
然而，对于这些DEM数据的地形信息容量特征却未能从理论上予以阐明。
China would require an extensive database of accurate topographic information to use terrain comparison (TERCOM) guidance.
中国需要一个大规模精确地形信息数据库去用于地形匹配(TERCOM)制导。
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。
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 steps for the system establishment include digitizing the forest types map and topographic map and linking the attributes of forest types and spatial information.
该系统的建立包括林相图、地形图的数字化与处理，小班属性与空间信息系统相联结。
To implement topographic map digitalization by means of MAPGIS is one of main means of getting spatial geographic information data, and that digitalization could bring out diversified sorts of errors.
利用MAPGIS实现地形图数字化是获取空间地理信息数据的主要手段之一，而图形数字化过程中会产生各种类型的误差。
The method includes various information such as survey line, control-point, topographic drawing and satellite photo etc and is gained broad application in petroleum exploration of Junggar basin.
该方法包含了测线、控制点、地形图、卫星照片等多种信息，在准噶尔盆地石油物探中得到了广泛的应用。
The campus topographic map was managed by applying Geographic Information System (GIS) and the channels of managing elements of topographic map were probed.
本文应用GIS管理技术对校园地形图进行管理，并探讨了对地形图要素进行管理的途径。
The topographic map contains a large amount of elevation information, and is an important source of DEM data.
地形图中包含了大量的高程信息，是DEM数据的重要的来源。
First, we must strengthen the construction of geographic information data sources, using 3 to 4 years time to achieve full coverage of the basic topographic maps.
一是要加强地理信息数据资源建设，利用3至4年时间实现基本地形图全覆盖。
Orthophotomap has been increasingly used to practical production because it keeps rich aerial photograph information and has the feature of topographic map.
正射影像图因为保留了航摄像片丰富的影像信息又具有地形图的特征，因此，在实际生产中得到了越来越广泛的应用。
Orthophotomap has been increasingly used to practical production because it keeps rich aerial photograph information and has the feature of topographic map.
正射影像图因为保留了航摄像片丰富的影像信息又具有地形图的特征，因此，在实际生产中得到了越来越广泛的应用。
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