利用GIS方法建立了数字高程模型（DEM），研究了子汇水面积的边界。
By means of GIS method, the digital elevation model(DEM)is established, the subcatchment boundaries are studied.
DTM中属性为高程的要素称为数字高程模型。
It is called the digital elevation model whose attribute is elevation in DTM.
高质量数字高程模型的建立是DEM应用的重要前提。
High quality DEM construction is the important precondition of the application.
首先介绍了数字高程模型的基本知识，及其在水文中应用。
At first, the basic knowledge of DEM and its application in the hydrology were introduced.
数字高程模型(dem)是地理信息系统的一种基础数据。
Digital Elevation Model (DEM) is an important type of basic data in gi s.
研究数字高程模型(DEM)在滑坡地表排水辅助设计中的应用。
This paper studies the application of digital elevation model (DEM) to the design of the surface drainage ditch system.
基于规则数字高程模型格网的峡谷检测是地形特征分析的重要手段。
Valley extraction based on a regular DEM grid is an important method for terrain analyzing.
结合数字高程模型的特点，对土石方工程量格网法计算方法进行改进。
Combined with the digital elevation model characteristics, this paper improves the grid method that is used to calculate earth-rock volume.
干涉合成孔径雷达是获取场景数字高程模型和正射影像图的有效技术之一。
Interferometric Synthetic Aperture Radar is an effective technique to get Digital Elevation Model and orthophoto map.
机载激光点云数据滤波是获取高精度数字表面模型和数字高程模型的关键。
Airborne lidar point cloud filtering is the key of acquiring DSM and DEM with high precision.
从制作技术、数据检查、质量管理等方面分析了数字高程模型数据库的建设。
This paper analyzes on the construction of DEM database from the making technique, data checking and quality control.
基于数字高程模型（DEM）中提取流域水系是分布式水文模拟的基础与关键。
The foundation of the simulations lies on how to obtain hydrologic and topographic parameters from Digital Elevation Model(DEM).
介绍基于地表径流漫流模型从数字高程模型(dem)提取水系的一系列算法。
A set of algorithms for extracting drainage network from digital elevation model (DEM) based on ground water overflow model is introduced.
数字高程模型(dem)是地理信息数据库的基本内核，其应用的广泛性不言而喻。
DEM is the basic kernel of data-base of geographical information, which has wide applications.
应用纹理映射技术将TM影像与数字高程模型结合，实现准动态监测湿地的水文变化。
TM image and DEM are combined using texture mapping technology, thus realizes monitoring the hydrological change of wetland dynamically.
本文主要对大规模地形数据(基于规则格网数字高程模型)的组织与可视化进行研究。
In this paper, study on organization and visualization of the massive terrain dataset mainly on Regular Square Grid data format are discussed.
数字高程模型(dem)是人们研究地表过程、构造地貌的一种行之有效的方法和手段。
Digital elevation model (DEM) analysis is one of the most effective methods for studying surficial processes and geomorphology.
在数字高程模型(DEM)允许误差的条件下，一定存在最优基线使得DEM精度最佳。
In the condition of acceptable Digital Elevation Model (DEM) error, there must be an optimal baseline which makes DEM precision highest.
本模型只需数字高程模型(dem)就可计算太阳直接辐射、日照时间和简化的散射辐射。
The model presented here only USES a digital elevation model (DEM) to compute direct solar radiation, time of irradiation and simply diffuse radiation.
高精度数字高程模型(DEM)是水土流失规律研究与流域地形空间分析中重要的空间数据。
High accuracy DEMs is an important data in study of soil erosion and terrain feature space analysis.
数字高程模型(dem)是重要的基础地理信息数据，在军事和民用领域有着重要的应用价值。
Digital elevation model (DEM) is the fundamental infrastructure of geographical information systems and has wide applications in both military and civil areas.
说明了实现人工阴影和人工立体观察像对的方法的基本原理及其在处理数字高程模型数据上的应用；
The Principles of the techniques about shaded relief and synthetic stereo-pair viewing of images as well as their application in digital elevation model data processing are described.
利用三线阵c CD图像自动提取数字高程模型(dem)的关键问题是立体像对的匹配相关技术。
The key problem to generate automatically the digital elevation model (DEM) by three-line CCD camera for photographic measurement is the stereo image matching technology.
在遥感与GIS技术的基础上，应用数字高程模型(DEM)生成的格网模型进行洪水的淹没分析。
Based on remote sensing technology the GIS grid model generated by digital elevation model (DEM) is utilized to analyze the flood submergence.
这两个模块的结合，实现了遥感影像、矢量地图、数字高程模型以及三维场景数据的统一管理和调度。
All of these two modules achieve unified management and scheduling about remote sensing images, vector maps, digital elevation models and three-dimensional scene data.
数字高程模型(DEM)生产中最关键的环节是质量控制，而粗差是影响DEM质量的重要因素之一。
Quality control is the key link in DEM production, and the gross error is one of important factors affecting DEM quality.
建立这些数字高程模型，有无数的用途，可以帮助军用飞机超低飞行，可以给救济工作人员显示地震的哪里破坏最大。
Their digital elevation model will have myriad USES, from helping military jets fly ultra low to showing relief workers where an earthquake's damage is worst.
数据库包括地图数据、遥感影像数据、文档数据、照片数据、数字高程模型以及各类数据的元数据信息。
The remote sensing datum, map datum, photo datum, document datum, DEM, and meta-data are included in the database.
数字高程模型(dem)是对地球表面地形地貌的数字表达、模拟，DEM在地质学中得以广泛的应用。
Digital elevation moded (DEM) is a digital expression of landform surface, and its application in geology has become more and more extensive.
例如，数字高程模型(Digital Elevation Model,DEM)数据点在网格图形中均匀排列。
For example, Digital Elevation Model (DEM) data points are equally arranged in a grid pattern.
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