【作者】 李科；

【导师】 游雄；

【作者基本信息】 解放军信息工程大学 ， 地图制图学与地理信息工程， 2008， 博士

【摘要】 网格环境下的地理信息服务是地理信息科学的一个新的研究方向,其相关理论和技术涵盖的研究内容十分丰富。本文在对网格、地理空间信息网格以及网格环境下地理信息服务技术体系等基础理论深入探讨的基础上,重点研究了网格环境下地理信息服务构建过程中的四个核心内容,即空间数据模型、地理信息网络存储体系、地理信息服务构建的技术以及地理信息服务组合的实现技术。在此过程中探索性地提出了一些新的概念、模型和方法,并通过建立实验系统和典型应用进行技术可行性验证,为进一步开展网格环境下的地理信息服务及其相关技术的研究打下了理论和技术基础。本文的主要研究成果包括:1、深入探讨了网格环境地理信息服务技术体系等基础理论问题。描述和定义了地理信息服务的构成,确定地理信息服务各层、各服务的功能以及它们相互之间的关系,为网格环境下地理信息服务的构建提供总体框架和顶层指导。2、构建了一个面向地理信息共享和互操作的空间数据模型。空间数据的四个不一致问题一直是地理信息科学所面临的一个难题,制约着地理信息服务大众化的进程。本文对四个不一致问题分别采用了不同的解决方法,构建出一个合理的空间数据模型。在此基础上进行了网格环境下空间数据集成与访问的研究。3、提出并构建了一个网格环境下空间数据网络存储体系。本文利用网格的思路,采用服务器机群的方式,利用空间数据分块的方法,将数据块合理的分布到由高速网络连接的存储设备上,从而实现了空间数据异地存储,高效调度的目的。4、提出并构建了适合网格环境下地理信息服务应用的空间数据索引算法和空间数据缓存体系。索引和缓存是网格环境下空间数据服务性能优化的重要手段。因此本文设计并实践了网格环境下多级缓存体系和自适应双层网格索引模型。5、实践了Web服务技术,在网格环境下实现了基于WSRF规范的地理信息服务。利用COM+与WSRF相结合的技术路线实现了地理信息服务中的两个基本服务,网络要素服务(WFS)和网络地图服务(WMS)。6、将本体技术引入地理信息服务中,解决地理信息服务组合中的服务语义描述与匹配的难题。深入研究并实现了地理信息服务的语义描述,以及基于语义的地理信息匹配算法。7、提出了地理信息服务组合技术方案。在基于语义的地理信息匹配算法的基础上,深入探讨了Web服务组合算法、思路、过程和步骤,设计了一个能支持动态服务组合的、基于本体的地理信息服务组合方案。更多还原

【Abstract】 Geographic information service based on grid is an emerging part of geographic information science. It covers many theories and technologies. This paper firstly discusses some basic theories including grid, geographic information service grid and its structure, and then focuses on four crucial issues: spatial data model based on grid, network storage framework of geographic information based on grid, construction technology of geographic information service based on grid, and combination of geographic information service. During the research some new conceptions, models and methods are developed and the technologies are testified by experiments and applications. All the work that will help greatly further study on grid-based geographic information service includes:1. Make a detailed investigation on the geographic information service framework based on network. Describe and define the compositions of geographic information service, and determine layers of geographic information service, their functions and the relations. Provide a complete framework and a primary guide for geographic information service.2. Construct a spatial data model oriented to the share and inter-manipulation of geographic information. The four inconsistencies of spatial data are always difficulties in geographic information science and limit the widespread of geographic information service. Handle each inconsistency respectively and build a reasonable model of spatial data. This thesis achieve a unified interface to the grid environment heterogeneous spatial data access and integration.3. Propose and construct a network storage engine of spatial data based on grid. Realize storage of spatial data that is located in different places and effective management using grid, server cluster, spatial data division, and data distribution to the storage devices linked by high-speed network.4. Suggest and built an algorithm of spatial data index and a buffer memory structure of spatial data that both suits the geographic information service based on grid. Spatial index and cache are important solutions of the optimization of the geographic information service based on grid. Design and implement a multi-level cache and a two-layer and self-adapted spatial index model.5. Using Web service technique, implement a grid geographic information service based on WSRF standard. Furthermore, implement two basic geographic information services, web feature service and web map service.6. Introduce ontology to geographic information service to resolve the matching and meaning description in the combination of geographic information service. And realize meaning description of geographic information service and matching algorithm of geographic information based on meaning.7. Suggest a structure of the combination of geographic information service. Explore the thought, algorithm, and process of Web service combination and design an ontology-based combination method of web geographic information service that supports dynamical combination.更多还原