数字线划地图的管理

发布时间：2018-03-21 18:34

本文选题：数字线划地图　切入点：数据管理　出处：《长安大学》2013年硕士论文　论文类型：学位论文

【摘要】：数字线划图(DLG)和地图是表达地理要素的两种重要形式，前者用矢量骨架和属性来表达地理要素，后者是一个区域内地理要素符号的集合，二者具有对应性，这使得数字线划图和地图的一体化成为可能。目前测绘行业对这两种数字产品的作业方式是先生产DLG数据，再进行地图制图，导致两种数据无法进行同步更新；在应用上，数字线划图和地图采用的数据库不同，使得对于二者应用的拓展变得困难；在管理上，DLG数据与地图符号数据在数据模型上的不一致，严重影响建库与制图的效率。如何在统一框架下对DLG数据与地图数据进行有效管理成为当务之急。为解决这一问题，本文对其中涉及的一系列问题进行研究。本文针对数字线划地图的管理，从数据统一存储、查询、表达三个方面展开研究。首先，，在对传统空间数据管理方式的分析基础上，基于面向对象的思想，对利用关系数据库管理空间数据的模式进行拓展，统一存储数字线划地图的空间、属性数据和地图符号数据。其次通过对标准SQL语言的扩展，解决标准SQL语言无法进行空间数据操纵的问题，实现空间要素的几何、属性及符号图形数据间的互查询操作。最后，在对数字线划地图中各种组成元素特点进行分析的基础上，分别针对图形、文字、图像及符号数据进行描述与表达。根据图形、文字和图像数据类型的各自特点，分别进行不同数据结构设计，同时利用PostScript语言对地图符号数据进行参数化描述。本文实现了空间数据与地图符号在统一框架下的管理，得到了通过拓展关系数据库与标准SQL语言完成数据统一管理与操纵的方法。文中提出了DLG数据与地图符号数据的一体化管理的解决方案，并在此基础上进行了实际数据管理的设计与测试，验证了该方案在一体化数据管理中的可行性。
[Abstract]:Digital line map (DLG) and map are two important forms of expressing geographical elements. The former uses vector skeleton and attributes to express geographical elements, and the latter is a collection of geographical element symbols in a region. This makes it possible to integrate digital line mapping and mapping. At present, the mapping industry is to produce DLG data first, then map mapping, resulting in the two kinds of data cannot be updated synchronously. The different databases used in digital line drawing and map make it difficult to expand their application, and the management of DLG data and map symbol data is inconsistent in data model. How to effectively manage DLG data and map data under the unified framework is an urgent task. In order to solve this problem, a series of problems are studied in this paper. In this paper, the management of digital line map is studied from three aspects: unified data storage, query and representation. Firstly, based on the analysis of the traditional spatial data management, the paper is based on the idea of object oriented. The model of managing spatial data by relational database is extended, and the spatial, attribute data and map symbol data of digital line map are stored uniformly. Secondly, by extending the standard SQL language, To solve the problem that the standard SQL language can not manipulate spatial data, and to realize the interquery operation of geometric, attribute and symbolic graphic data of spatial elements. Finally, on the basis of analyzing the characteristics of various elements in digital line map, According to the characteristics of graphic, text and image data types, different data structures are designed. At the same time, we use PostScript language to parameterize the map symbol data. This paper realizes the management of spatial data and map symbols under the unified framework. The method of unified data management and manipulation by extending relational database and standard SQL language is obtained. The solution of integrated management of DLG data and map symbol data is put forward in this paper. On this basis, the design and test of the actual data management are carried out, and the feasibility of the scheme in the integrated data management is verified.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P208

【引证文献】