分布式网络环境下地理模型就地共享关键技术研究

发布时间：2018-04-30 04:27

本文选题：地理模型 + 就地共享　；参考：《南京师范大学》2013年硕士论文

【摘要】：地理模型的网络共享是继地理数据共享之后地理信息共享领域必须解决的重要问题,已引起学界的高度重视。现有的地理模型资源共享方式都以特定应用领域内的集中式共享为主,这种方式存在不支持多领域的模型协同,安全性较低、系统运行开销较大、模型运行环境异构、代码改写和迁移成本过高等问题。伴随着计算机技术和互联网技术的日趋成熟,普通计算机已经具备了替代服务器为多用户提供基本运算服务的能力,因此,可以考虑实现地理模型的就地部署和就地运行,将以往一台服务器承担的访问和运算压力均分至网络空间中的多台主机,实现多源异构地理模型资源的分布式就地共享。本文从地理模型的应用特征和共享需求出发,分析地理模型就地共享模式。由地理模型提供者和地理模型使用者的双重角度总结地理模型就地共享模式在面向异构网络环境应用时存在的关键问题,并根据当前技术发展现状,分析出解决问题的基本思路。本文的主要研究内容与成果包括： (1)分析和总结地理模型的固有特点,提炼出地理模型在应用过程中表现出的特征以及与之对应的地理模型资源的共享需求。由地理模型提供者和地理模型使用者两个角度出发,总结异构网络环境下地理模型就地共享需要解决的关键问题。 (2)研究地理模型就地共享中资源的分布特征,提出基于分布式散列函数算法的地理模型资源网络标定技术,为地理模型资源的高效检索提供支持。 (3)针对地理模型就地共享中的异构网络环境的问题,提出基于NAT穿越的地理模型资源网络穿透调用技术,力图实现地理模型资源在异构网络环境中的透明访问。 (4)面向地理模型就地共享的应用需求,扩展Web服务的服务描述语言并构建地理模型服务描述文档,同时通过对Web服务的简单对象访问协议进行改进,设计地理模型服务消息协议。研究基于地理模型资源在分布式网络环境下的共享需求,立足于技术发展现状,面向地理模型就地共享中的共性特征,旨在解决地理模型就地共享中的资源标定与异构网络问题,最终通过所研究的关键技术支撑多源异构地理模型在分布式网络环境中的就地共享,具有较高的应用价值。
[Abstract]:The network sharing of geographical model is an important problem that must be solved in the field of geographic information sharing after geographical data sharing, which has attracted great attention of scholars. The existing geographic model resource sharing methods are mainly centralized sharing in specific application fields. This method has the advantages of low security, low security, high system overhead and heterogeneous model running environment, which does not support multi-domain model cooperation. Code rewriting and migration costs are too high. With the maturity of computer technology and Internet technology, ordinary computers already have the ability to replace servers to provide basic computing services for multi-users. The pressure of access and operation on a single server is divided equally into multiple hosts in the network space to realize the distributed and local sharing of multi-source and heterogeneous geographic model resources. Based on the application characteristics and sharing requirements of geographical model, this paper analyzes the local sharing mode of geographical model. This paper summarizes the key problems existing in the application of geographical model local sharing mode in heterogeneous network environment from the point of view of geographical model provider and geographical model user, and according to the current technological development situation, The basic idea of solving the problem is analyzed. The main contents and achievements of this paper are as follows: 1) analyze and summarize the inherent characteristics of geographical model, extract the characteristics of geographical model in the application process and the corresponding sharing requirements of geographical model resources. From the point of view of geographical model provider and geographical model user, this paper summarizes the key problems that need to be solved in local sharing of geographical model in heterogeneous network environment. 2) the distribution characteristics of resources in local sharing of geographical model are studied, and the calibration technology of geographical model resource network based on distributed hash function algorithm is proposed, which provides support for efficient retrieval of geographical model resources. 3) aiming at the problem of heterogeneous network environment in local sharing of geographical model, this paper puts forward the network penetration call technology of geographical model resources based on NAT traversal, in order to realize the transparent access of geographical model resources in heterogeneous network environment. In order to meet the application requirement of local sharing of geographical models, we extend the service description language of Web services and construct the service description documents of geographical model. At the same time, we improve the simple object access protocol of Web services. Design geographic model service message protocol. This paper studies the sharing requirements of resources based on geographical model in distributed network environment, based on the status quo of technology development, facing the common characteristics of geographical model sharing in place. The purpose of this paper is to solve the problem of resource calibration and heterogeneous network in the local sharing of geographical models, and finally support the local sharing of multi-source heterogeneous geographical models in distributed network environment through the key technologies studied, which has high application value.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P208

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