文档介绍：基于GML的多源数据转换方法实现
摘要:论文对应用GML(Geography Markup Language,地理标识语言)解决地理信息共享的国内外研究现状进行了分析,针对目前地理信息共享的需求,提出了运用GML解决地理信息共享问题。对GML进行了分析,详细说明了读取多源空间数据并向GML转换的关键技术,开发了一个多源GIS数据向GML转换的工具,利用该工具基本实现了多源空间数据在数据格式层次上的集成和共享,并利用ArcGIS软件及其数据互操作扩展模块对转换结果进行了分析,结果表明此转换工具转换前后除汉字编码问题外并无空间和属性数据的损失,工具与现有GIS平台自带转换软件相比更加简单方便、费用低,满足了数据转换的基本要求,最后提出了基于GML和地理信息服务标准的地理信息共享架构,为今后的地理信息共享研究提供了一个可行的解决方案。
关键词:GML;多源空间数据;数据转换;信息共享
Abstract:This paper analyzes the actuality of sharing geographic information by using GML (Geography Markup Language) in china and abroad. To satisfy the need of geographic information’s sharing, a GML based scheme is advanced. Then the specification of GML is analyzed. It gives a detailed description of the key technologies to retrieval multi-source spatial data and to convert it to GML documents. A converting tool for multi-sources spatial data to GML documents has been developed. In this way, we can achieve data integration and interoperability from multi-resources and different format in the data format level. Then it analyzes the conversion results making use of the ArcGIS software and its Data Interoperability expansion module. The results indicate that in addition to Chinese character encoding, there is no loss of spatial and attribute information between the source and the conversed data by using the developed conversion tool. This tool is lower in expense, more convenient and simple to paring the existing GIS transform software. It meets the basic demands of data conversion. Finally, GML and geographic information service standard based information sharing framework is put forward, to provide a solution in the future research.
Keywords:GML; multi-source spatial data; data conversion; information sharing
1引言
近年来,随着计算机技术的飞速发展,GIS(Geographic Information System,地理信息系统)技术也得到了快速的发展和广泛的应用。然而,随之而来的各种问题和弊端也逐渐显露。尤其是各种GIS软件、硬件和数据格式并存,使得地理信息很难共享,这一方面造成了系统间的隔阂,另一方面也造成了极大的人力、物力和财力浪费。
在这种情况下,人们意识到只有软件、硬件、数据等要素进行必要的标准化才能更有效、广泛地使用GIS,标准化的真正实现将使人们能在一个共同理解基础上共享信息和资源[1]。这其