The type of spatial data model: the model based on object (element); network model; field model.
空间数据模型的类型：基于对象(要素)的模型；网络模型；场模型。
By VRML, the users of the World Information Network can view spatial model, without being confined to planar graph, image.
通过VRML，全球信息网的使用者可以观赏到立体空间的模型，而不限于二维空间的图形、影像。
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 also extends a role-based authorization constraint model to describe constraints with spatial character on different levels, which is suited for wireless network.
对角色的授权约束加入空间特性，使之能够形式化描述多个层面的空间职责分离约束，从而适用于无线网络的应用环境。
Design the framework of "Tourism Spatial Information Publish System" and the plan about how to divide the functional model, how to organize the data, how to optimize the performance of the network.
设计“旅游空间信息发布系统”总体框架、系统功能、数据组织方案及网络性能优化方案。
Research results indicated that the BP neural network model could accurately reflect the spatial law of water area's subsidence and predict the subsidence caused by underground mining precisely.
通过研究表明本文所建立的BP神经网络模型能较准确反映采水地面沉降的规律，同时也能较准确地预测地下水开采引起的地面沉降。
Research results indicated that the BP neural network model could accurately reflect the spatial law of water area's subsidence and predict the subsidence caused by underground mining precisely.
通过研究表明本文所建立的BP神经网络模型能较准确反映采水地面沉降的规律，同时也能较准确地预测地下水开采引起的地面沉降。
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