本文選題：地理模型 + 就地共享�。� 參考：《南京師范大學(xué)》2013年碩士論文

【摘要】：地理模型的網(wǎng)絡(luò)共享是繼地理數(shù)據(jù)共享之后地理信息共享領(lǐng)域必須解決的重要問題,已引起學(xué)界的高度重視�，F(xiàn)有的地理模型資源共享方式都以特定應(yīng)用領(lǐng)域內(nèi)的集中式共享為主,這種方式存在不支持多領(lǐng)域的模型協(xié)同,安全性較低、系統(tǒng)運(yùn)行開銷較大、模型運(yùn)行環(huán)境異構(gòu)、代碼改寫和遷移成本過高等問題。伴隨著計(jì)算機(jī)技術(shù)和互聯(lián)網(wǎng)技術(shù)的日趨成熟,普通計(jì)算機(jī)已經(jīng)具備了替代服務(wù)器為多用戶提供基本運(yùn)算服務(wù)的能力,因此,可以考慮實(shí)現(xiàn)地理模型的就地部署和就地運(yùn)行,將以往一臺(tái)服務(wù)器承擔(dān)的訪問和運(yùn)算壓力均分至網(wǎng)絡(luò)空間中的多臺(tái)主機(jī),實(shí)現(xiàn)多源異構(gòu)地理模型資源的分布式就地共享。 本文從地理模型的應(yīng)用特征和共享需求出發(fā),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雙重角度總結(jié)地理模型就地共享模式在面向異構(gòu)網(wǎng)絡(luò)環(huán)境應(yīng)用時(shí)存在的關(guān)鍵問題,并根據(jù)當(dāng)前技術(shù)發(fā)展現(xiàn)狀,分析出解決問題的基本思路。本文的主要研究?jī)?nèi)容與成果包括： (1)分析和總結(jié)地理模型的固有特點(diǎn),提煉出地理模型在應(yīng)用過程中表現(xiàn)出的特征以及與之對(duì)應(yīng)的地理模型資源的共享需求。由地理模型提供者和地理模型使用者兩個(gè)角度出發(fā),總結(jié)異構(gòu)網(wǎng)絡(luò)環(huán)境下地理模型就地共享需要解決的關(guān)鍵問題。 (2)研究地理模型就地共享中資源的分布特征,提出基于分布式散列函數(shù)算法的地理模型資源網(wǎng)絡(luò)標(biāo)定技術(shù),為地理模型資源的高效檢索提供支持。 (3)針對(duì)地理模型就地共享中的異構(gòu)網(wǎng)絡(luò)環(huán)境的問題,提出基于NAT穿越的地理模型資源網(wǎng)絡(luò)穿透調(diào)用技術(shù),力圖實(shí)現(xiàn)地理模型資源在異構(gòu)網(wǎng)絡(luò)環(huán)境中的透明訪問。 (4)面向地理模型就地共享的應(yīng)用需求,擴(kuò)展Web服務(wù)的服務(wù)描述語(yǔ)言并構(gòu)建地理模型服務(wù)描述文檔,同時(shí)通過對(duì)Web服務(wù)的簡(jiǎn)單對(duì)象訪問協(xié)議進(jìn)行改進(jìn),設(shè)計(jì)地理模型服務(wù)消息協(xié)議。 研究基于地理模型資源在分布式網(wǎng)絡(luò)環(huán)境下的共享需求,立足于技術(shù)發(fā)展現(xiàn)狀,面向地理模型就地共享中的共性特征,旨在解決地理模型就地共享中的資源標(biāo)定與異構(gòu)網(wǎng)絡(luò)問題,最終通過所研究的關(guān)鍵技術(shù)支撐多源異構(gòu)地理模型在分布式網(wǎng)絡(luò)環(huán)境中的就地共享,具有較高的應(yīng)用價(jià)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.
【學(xué)位授予單位】：南京師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：P208

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本文編號(hào)：1823085