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。
The overlaying of the vector data above 3D terrain offers the data basis for the spatial data analysis.
矢量数据的加入为在三维地形上进行空间分析提供了可能性。
High accuracy DEMs is an important data in study of soil erosion and terrain feature space analysis.
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。
The system comprised terrain and meteorological data pre-process module, vegetation dynamic simulation module (including disturbance) and results analysis module.
干扰模拟体系由地形数据预处理、气候数据预处理、植被动态模拟(含干扰)、结果分析四大模块组成。
In the study of the method for extracting topographic patterns based on Grid data, the author introduces the terrain profile analysis method and the falling water simulations method.
在研究基于规则格网数据地形特征提取过程中，本人先后介绍了断面极值法和流水模拟法。
In the study of the method for extracting topographic patterns based on Grid data, including the terrain profile analysis method and the falling water simulations method.
在研究基于规则格网数据地形特征提取过程中，主要有断面极值法和流水模拟法。
TIN composing discrete terrain points almost has the same amount of spatial data as it is and the response time of analysis and 3d visualization becomes too long to wait for.
由离散高程点生成的TIN同样也具有相当大的数据量，这严重制约了TIN的分析、三维可视化等处理速度。
TIN composing discrete terrain points almost has the same amount of spatial data as it is and the response time of analysis and 3d visualization becomes too long to wait for.
由离散高程点生成的TIN同样也具有相当大的数据量，这严重制约了TIN的分析、三维可视化等处理速度。
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