提出一种基于多层dem与似三棱柱体元(QTPV)的混合三维数据模型。
A hybrid 3d spatial data model based on multi-DEMs and quasi tri-prism volume (QTPV) is proposed.
矿山地质三维数据模型是实现矿山3DGIS的基础，也是矿山3D GIS研究的重点和难点。
Three-dimensional data model of geology in mine is the foundation of mining 3D GIS, and also the keystone and difficulty in the studies of GIS.
地下水运动三维可视化的关键技术是对三维数据模型构造、网格数据的自动生成以及三维数据可视化集成。
The 3D-Visualization key techniques of groundwater movement are the three dimensions data model construction, mesh data automatic creation and three dimensions data visualization integration.
对涉及到的关键技术包括三维数据模型的实现、二维数据的嵌入与操作、日照分析关键技术等都进行了详尽的介绍。
Some relative key techniques including the design of 3D data model, database management based on Oracle, the fusion between CAD data and GIS data, sunlight analysis and so on are emphasized.
它是生成三维立体地貌，计算地面距离、坡度、土方、面表积等的基础数据模型，也是巡航飞行器地形相关匹配的基础数据。
It is the basic model for various GIS operations, and the key data for terrain correlation matching of cruise missiles as well.
在FLY模块下，分别装入纠正好的TM影像和DEM，即可生成遥感信息三维飞行数据模型。
Under fly model, already corrected TM and DEM images are set up, which can form three-dimensional flying model of remote information.
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 ModeI (DEM) is a common model of three dimension terrain, and digital analysis is mainly based on DEM.
三维地质模型在计算机中的数据表达就是三维地质模型的数据模型，它具有确定性、可视性和可修改性的特点。
Data expression method of 3d geological model in computer is data model of 3d geological model. It has characters of certainty, visualization and modifiability.
交通基础设施管理功能，能够实现应用平台上交通设施分类管理，并且通过三维仿真将道路、桥梁、高架、天桥地道、大型桥隧等不同的管理对象建立了相应的数据模型。
This function makes sort management on the platform come true. Moreover, according to the 3d simulation, it creates relevant data model for road, bridge, overpass, tunnel and other targets.
充分利用三维实体数据的完整性，实现各层次二维图形的自动生成和结构力学分析所需的数据模型的自动建立；
Making full use of integrity of 3D model information, the system automatically generates various kinds of 2D drawings and constructs the data model for structural analysis.
充分利用三维实体数据的完整性，实现各层次二维图形的自动生成和结构力学分析所需的数据模型的自动建立；
Making full use of integrity of 3D model information, the system automatically generates various kinds of 2D drawings and constructs the data model for structural analysis.
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