【作者】 兰华；

【导师】 况明生；

【作者基本信息】 西南大学 ， 地图学与地理信息系统， 2007， 硕士

【摘要】 信息高速公路的建立，为全社会的信息共享创造了条件。互联网与地理信息系统的结合，改善了地理空间信息的获取、共享、发布与分析状况。WebGIS以其独特的优势，成为当今GIS研究的热点。由于传统的GIS系统中数据格式未统一，使得各个系统之间难以实现数据的共享，难以实现网上互操作，不能满足WebGIS发展的需求。本文认为可以用XML技术解决这些问题。首先从地理数据格式入手，对OGC发布的GML3.0白皮书进行了详细的模式分析研究，阐述了主要模式的结构、特点。在此基础上，部分实现了基于GML的地理数据编码方案，证明了基于GML的数据结构的可行性。其次，本文从地理数据的储存方式入手，主要分析了纯XML数据库的特点，比较了现有的XML文档树编码方案，提出了一种基于定深定宽子树的前缀编码方案。该方案不仅查询语义简单，而且处理删除和更新操作方便，并能有效的解决传统前缀编码方案中的节点深度和广度问题，从而实现用定长数据的统一编码。本文也说明了基于该编码方案的物理上XML数据的记录结构。再者，本文从地理数据的显示入手，主要分析了从GML到SVG的转换方式，用XSLT技术实现了一个GML文档到SVG的转换，从而证明了建立基于GML的地理数据储存、交换和基于SVG的地理数据显示的WebGIS模型的可行性。最后，本文得出以下结论：基于GML的GIS将成为下一代GIS的主流；基于SVG的绘图技术将成为网络图像显示的主流；GML与SVG的结合将促成WebGIS的快速发展；基于纯XML数据库的WebGIS系统仍待完善提高。更多还原

【Abstract】 The building-up of Information express highway have created condition for the information share of entire society。When Geographic information system and the Internet union, it have been improved in gaining, enjoying, announces and analyses of geographical feature space information. WebGIS becomes the hot spot that GIS studies nowadays with whose unique advantage. Realizing the data share one by one between system is difficult, realization is handled mutually on the net being also difficult since the data form has not united in the tradition GIS system, this can not satisfy the request that WebGIS develops.This thesis thinks that using XML technology to resolve these problems is feasible. We start with geographical feature data form first, the detailed analysis having been in progress to pattern in the GML3.0 white book announcing from OGC studies, expounded the main pattern structure and characteristic. On this basis, having realized GML-based geographical feature data code scheme , having testified GML-based data structural model is feasible.Secondly, this thesis has studied geographical feature data storing up way , the characteristic having analysed the pure XML data base mainly, the now available code scheme having compared . This thesis have brought forward one kind of the prefix code scheme with the fixing depths and width sub tree. According to this scheme, the operation of seeking and deleting and renewing all is simple, the problem solving about node depth and extent in tradition prefix code scheme has effect, have realized the unified code being in progress with fixed length data. This thesis has also explained XML data physics structure owing to being the code scheme’s turn.. Moreover, this thesis has studied geographical feature data display , has analysed the conversion mode from GML to SVG mainly, have realized a GML document changing to SVG document with XSLT technology, have ascertained the feasibility building the WebGIS model judging by GML and SVG technology.Finally, this thesis reaches the following conclusion: The GIS base on GML will become younger generation GIS; the SVG technology will become the main current in the network image processes; under the condition that GML and SVG combine, WebGIS will be developed rapidly; owing to pure XML data base , the WebGIS system still waits for perfecting rise.更多还原