Spatial data model is formalized according to partial order relationship , equivalence relationship and simplicial complex theory . a formalizing two - tuple ( m , f ) multi - resolution spatial data model is presented . based on the jarno peschie algorithms , an improved algorithm of road network map generalization is developed 应用偏序关系、等价关系和单纯复形理论,初步研究了多分辨率空间数据模型形式化表达方法,提出了一个二元组形式化多分辨率空间数据模型。
Based on the theory and method of abstract , inheritance and polymorphism of object - oriented technology , this paper brings the rdbms elements of view , relation , table and role into the model of spatial data in gis , and develops a new spatial data model based on rdbms 摘要本文利用面向对象的抽象、继承和多态等理论和方法,将数据库中的视图、关联、表、角色等概念引入到面向对象的空间数据模型中,提出了一种面向应用、面向主题的基于对象关系数据库的空间数据模型。
Starts from analyzing a special gis applications , the paper points out its widely existence in dss and mis , presents a spatial data model based on constructed point set storage and its developed spatial - temporal model , and proves the validity and practicability of the presented models from theory and actual application 本文从分析一类特殊的gis应用出发,指出了该类应用在mis和dss领域的存在性和广泛性,井针对该类特殊应用提出了基于构造点集的空间数据模型及其时态拓展模型,通过理论分析和实际的应用实践,证明了该模型的有效性和适应性。
Finally , on the basis of the above work i realize a web gis named digital olympic village information system , by which the above work is proved right . this paper has two innovations . they are a simple spacial data model and a new service named geographical short message service 本文的创新点有二:一是提出了一种简单实用的空间数据模型:基于元数据体系的分布式空间数据模型,一是把短信息平台嵌入到webgis中,提出地理短信息服务,并给出解决方案,经实践证明具有可行性。
This paper which starts from the actual needs , directed by the theory of cartology analyses all kinds of requires and functions for dmges , and create the spatial data model of the software system , combining the new generation programming technology , taking the oo software modeling , analysis , design method , it realized the collection , display of digital map data and the building of map denotation library , hi the end , this paper put forward the go - on research in future 本文从数字地图制图的实际需要出发,在地图学理论的指导下分析了数字地图图形编辑系统的各种功能和需求,并建立了软件系统的空间数据模型。结合新一代的计算机程序设计技术,采用面向对象的软件建模、分析和设计方法实现了地图数据的采集、显示、编辑、地图符号库的建立。最后提出了需要进一步研究和完善的内容。
Analyzes the basic features of a special gis applications and its basic demand , points out the localization of integrated gis platforms and its inelasticity , and presents a spatial data model based on constructed point set storage to satisfy with the demand of the special gis application . 2 分析了一类特殊gis应用的基本特点和基本功能需求,指出了现有gis平台的局限性和对该类应用的不适应性,针对该类特殊的gis应用,创造性地提出了能满足其要求的基于构造点集的全关系型空间数据模型。
This article discusses the standard of geographical information system and the model of geo - data . after analyzing the present system of geo - data share , presents a new method of spatial database . it designs and impalements a data share and exchange system , which enable storage geo - data attribute data and meta data to realize the integrative management of data 论文系统分析了地理信息系统标准和空间数据模型,并对常见的空间文件格式进行分析;总结以前的空间数据共享体系结构;提出了新的空间数据库平台共享方案;在研究了oraclespatial对空间数据解决方案后,设计并实现以oralcespatial为存储gis系统的空间数据、属性数据,和元数据,实现数据一体化管理模式;并实现esri公司的
Firstly this paper ananlyzed the way and problem of digital city in 3d visualization . then generalizing the development in 3d cis . especially in 3d spatial data model . based on the existing 3d data model , digital city is composed of piont , wire , surface > soild , we can use 3d vector data model in building 3d city model . on the other hand the paper emphasizes 3d reconstruction and 3d interactive of city building model 本文首先分析了数字城市三维可视化所面临的问题和发展现状,总结了当前3dgis ,特别是3d空间数据模型的特点和功能,在此基础上,把数字城市中几何目标分类为:点、线、面、体四种类别,采用了三维矢量数据模型建立三维城市模型,而且本文着重探讨了城市建筑物的三维重建以及三维交互。
This dissertation first discusses spatial data characteristics , and introduces spatial data models , spatial data structures and spatial indexes , and focus on the spatial data cache technology and the fast inquiry implementing agent technology and then analyzes the advantages of taking agent technology to solve the problems such as the network bandwidth dependence , the stability of data service , and query speeds which occur in the gis spatial data . this dissertation also discusses agent - based spatial data query model - absqm , which is designed according to agent 本文首先讨论了空间数据的特征,对空间数据模型、空间数据结构以及空间索引进行了分析与论述,重点探讨了空间数据缓存技术和实现快速查询的agent技术,分析了agent技术解决gis空间数据导致的网络带宽依赖、数据服务稳定性、查询速度等技术问题所具有的优势,对设计的基于agent的空间数据查询应用模型( absqm )进行了论述。