By means of GIS method, the digital elevation model(DEM)is established, the subcatchment boundaries are studied.
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。
For example, Digital Elevation Model (DEM) data points are equally arranged in a grid pattern.
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。
Digital elevation model (DEM) is the fundamental infrastructure of geographical information systems and has wide applications in both military and civil areas.
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。
As the data base of the GIS digital terrain analysis, digital Elevation Model (DEM) contains rich of terrain, topography and related geo-information and knowledge.
数字地形模型(DEM)包含着丰富的地形、地貌及相关的地学信息与知识，是GIS数字地形分析的数据基础。
Based on remote sensing technology the GIS grid model generated by digital elevation model (DEM) is utilized to analyze the flood submergence.
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。
This paper discusses the methods of automatic extraction of digital elevation model (DEM) from remote sensing image. A system of scheme is established to extract DEM from SPOT image.
本文研究了利用航天遥感影像自动提取数字高程模型（DEM）的方法技术，建立了一整套利用SPOT影像提取DEM的方案。
Digital elevation model (DEM) analysis is one of the most effective methods for studying surficial processes and geomorphology.
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。
The foundation of the simulations lies on how to obtain hydrologic and topographic parameters from Digital Elevation Model(DEM).
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 model presented here only USES a digital elevation model (DEM) to compute direct solar radiation, time of irradiation and simply diffuse radiation.
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。
DEM (Digital elevation Model) is a data set of plane coordinate or longitude, latitude, and elevation of the regular square grid points in some region.
数字高程模型(DEM)是一定区域范围内规则格网点的平面坐标及其高程的数据集或者是经、纬度和海拔高度的数据集。
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.
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。
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。
Water depth data (main parameters), which was matching to model's grid structure, was obtained by using the function of GIS digital elevation model (DEM) to linear-interpolate the isobath of chart.
在模型参数求取中应用了GIS的数字高程模型(DEM)功能将海图等深线通过线性内插得到与模型网格相匹配的具有栅格结构的水深数据(模型的主要参数)。
Digital Elevation model (DEM) is a common model of three dimension terrain, and digital analysis is mainly based on DEM.
在三维地形有关的数字分析中，地表面积是经常用到的数据。
By means of GIS method, the digital elevation model(DEM)is established, the flow direction, flow accumulation, subcatchment boundaries and stream network spatial distribution are studied.
采用GIS的方法，建立了环县数字高程模型（DEM），研究了本区地表水流方向、集流能力、子集水区的划分及水系网络空间分布等水文特征。
This paper studies the application of digital elevation model (DEM) to the design of the surface drainage ditch system.
研究数字高程模型(DEM)在滑坡地表排水辅助设计中的应用。
A set of algorithms for extracting drainage network from digital elevation model (DEM) based on ground water overflow model is introduced.
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。
In the condition of acceptable Digital Elevation Model (DEM) error, there must be an optimal baseline which makes DEM precision highest.
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。
Terrain fidelity of digital elevation model (DEM) can be enhanced by integrating terrain character points and terrain lines in the three dimensional model.
采用了地性特征点和地性线参与三维建模的方法，提高了数字高程模型DEM的地形逼真度。
Digital Elevation Model (DEM) is an important type of basic data in gi s.
数字高程模型(dem)是地理信息系统的一种基础数据。
Digital Elevation ModeI (DEM) is a common model of three dimension terrain, and digital analysis is mainly based on DEM.
数字高程模型(DEM)是一种常用的三维地形建模数据模型，三维地形的数字分析主要是针对dem模型的。
Digital Elevation Model(DEM) is a digital modeling process which aims at terrain and physiognomy. Irregular triangulation TIN is the best model when DEM data are stored and expressed.
数字地形模型是针对地形地貌的一种数字建模，这种建模的结果通常就是一个数字高程模型（DEM）。
The collected ground true data includes topography map with scale of 1:50 000 and the corresponding Digital Elevation Model (DEM).
收集的地理实况数据包括1：5万的地形图和根据该地形图经数字化处理生成的数字高程模型(dem)。
Because of adding 3 calibration parameters, the block adjustment of amplitude images and Digital Elevation Model (DEM) could be actualized at the same time.
由于改进的模型中增加了三个定标参数，因此能够同时实现多航带幅度图像以及数字高程模型(dem)的联合平差。
Because of adding 3 calibration parameters, the block adjustment of amplitude images and Digital Elevation Model (DEM) could be actualized at the same time.
由于改进的模型中增加了三个定标参数，因此能够同时实现多航带幅度图像以及数字高程模型(dem)的联合平差。
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