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。
At first, the basic knowledge of DEM and its application in the hydrology were introduced.
首先介绍了数字高程模型的基本知识，及其在水文中应用。
Phase unwrapping is one of the key steps for the processing of InSAR data. The quality of the unwrapping results affects the final DEM directly.
相位解缠是SAR干涉测量数据处理中的一个关键步骤之一，解缠结果的好坏直接影响最终数字高程模型的精度。
Using alternant dem the study raised a new method based on the relation of sedimentation and precipitation to acquire the amount of soil erosion on hillslopes.
笔者提出一种基于不同时相实测数据建立交互数字高程模型研究坡面土壤沉积与搬运间的量化关系的方法，进而获得小流域坡面不同时相间的土壤侵蚀量。
This paper analyzes on the construction of DEM database from the making technique, data checking and quality control.
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。
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。
Otherwise, based on DEM, digital model of KSD distribution, digital Se model and profile-map analysis, the research has a quantitative analysis of macro change rule in microelement distribution.
另外，建立了数字高程模型、数字克山病分布模型、数字硒模型并作剖面图分析，定量分析了地形与微量元素分布的宏观变化规律。
However, how to evaluate and control the quality of all sorts of data in the course of building DEM is a bottleneck problem of establishing various type databases and GIS.
如何评估利控制数字高程模型建立过程中各种数据的质量，是建立各种类型数据库和地理信息系统的“瓶颈”问题。
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。
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。
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。
TM image and DEM are combined using texture mapping technology, thus realizes monitoring the hydrological change of wetland dynamically.
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。
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。
Airborne lidar point cloud filtering is the key of acquiring DSM and DEM with high precision.
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。
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。
High quality DEM construction is the important precondition of the application.
高质量数字高程模型的建立是DEM应用的重要前提。
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。
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 accuracy of flood area is mostly dependent on the contour interval of map, accuracy of digitizing map, accuracy of DEM, and interval of GRID, detecting resolution of pixels.
对于采用本方法计算淹没区，准确性受地形图等高距大小、数字化采集精度、数字地面模型（DEM）高程精度以及格网间隔大小、像素探测分辨率等因素的影响。
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。
DEM is the basic kernel of data-base of geographical information, which has wide applications.
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。
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)。
Valley extraction based on a regular DEM grid is an important method for terrain analyzing.
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。
The landscape types and patterns were directly reflected by the overlay of the landscape types and the DEM of Harbin.
将景观类型和哈尔滨市数字高程模型（DEM）相叠加，更加直观地反映了哈尔滨城市郊的景观类型和景观格局；
The remote sensing datum, map datum, photo datum, document datum, DEM, and meta-data are included in the database.
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。
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。
And many key techniques such as VLL matching, multi-scale DEM, self-adapted matching window and thresholds for the framework are discussed and investigated deeply.
探讨了基于DEM的VLL物方影像匹配方法、多尺度表达的数字高程模型，以及自适应窗口大小和变化阈值的确定等用于三维变化检测的关键技术。
And many key techniques such as VLL matching, multi-scale DEM, self-adapted matching window and thresholds for the framework are discussed and investigated deeply.
探讨了基于DEM的VLL物方影像匹配方法、多尺度表达的数字高程模型，以及自适应窗口大小和变化阈值的确定等用于三维变化检测的关键技术。
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