The system adopts spatial data model based on the vector data model ; topology relation model uses spatial data model combined with spatial data index ; and makes use of relation database to save spatial entity data 本系统采用基于矢量数据模型的空间数据模型;拓扑关系模型采用空间数据模型与空间数据索引结合;采用关系数据库存储空间对象数据。
The validity and practicability of the presented models are proved from theory and actual application , and the presented spatial data model is proved to commendably satisfy with the demand of the above special gis applications 通过理论探讨和实际的应用验证,证明了该模型能很好地满足该类特殊应用的基本要求,同时也证明了该模型的有效性和实用性。
In this paper , we describe in detail the procedure of modeling with this approach : based on spatial data model , both abstract model and discrete model needed , defining spatio - temporal algebras in two abstract levels 本文详细论述了基于这种方法的时空数据的建模过程:以空间模型为基础,分抽象模型和离散模型,定义了两个抽象层次的时空代数系统。
Two kinds of multi - resolution spatial data model are studied in this paper . one is the feature model and hoom model based on dlg data . the other is multi - resolution dem model based on terrain data using the algorithms of self - adaptive triangular regular networks and hierarchical triangular irregular networks 论文主要对两种类型的多分辨率空间数据模型理论和实现技术进行研究,第一类空间数据是数字线划图数据dlg ,第二类是数字高程模型数据dem 。
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。
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。