本文關(guān)鍵詞： LOD 數(shù)據(jù)庫 空間索引 數(shù)據(jù)調(diào)度 三維可視化　出處：《遼寧工程技術(shù)大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著數(shù)字地球、數(shù)字城市及數(shù)字社區(qū)等建設(shè)的不斷開展，海量三維模型可視化技術(shù)已經(jīng)成為當(dāng)前發(fā)展的一個(gè)重要方向。如何對如此繁多的三維模型進(jìn)行快速、流暢的顯示，是目前首先需要解決的問題。本文針對城市三維建筑進(jìn)行研究，以海量三維模型可視化為目的，分別從三維模型數(shù)據(jù)的處理、管理、調(diào)度等方面入手，構(gòu)建全球范圍基于網(wǎng)絡(luò)的三維建筑可視化系統(tǒng)。 首先，分析了城市三維模型的數(shù)據(jù)內(nèi)容，明確了研究對象。通過對城市三維建筑模型結(jié)構(gòu)的分析，根據(jù)以后系統(tǒng)功能的需求，定義了新的三維模型數(shù)據(jù)結(jié)構(gòu)。系統(tǒng)采用了LOD模型技術(shù)，，文中分別對模型的幾何數(shù)據(jù)與紋理數(shù)據(jù)進(jìn)行簡化處理，幾何數(shù)據(jù)采用半邊折疊網(wǎng)格簡化算法，紋理數(shù)據(jù)采用小波算法進(jìn)行壓縮，兩種方式均減少了數(shù)據(jù)存儲(chǔ)的空間和網(wǎng)絡(luò)傳輸?shù)膲毫Α?其次，通過對地球表面進(jìn)行網(wǎng)格劃分，將全球三維建筑數(shù)據(jù)管理轉(zhuǎn)化成單個(gè)網(wǎng)格內(nèi)的三維建筑數(shù)據(jù)管理。對單個(gè)網(wǎng)格內(nèi)的三維建筑進(jìn)行數(shù)據(jù)庫組織管理，設(shè)計(jì)了數(shù)據(jù)庫表，同時(shí)考慮時(shí)態(tài)數(shù)據(jù)的管理，在實(shí)現(xiàn)了數(shù)據(jù)庫基本功能的同時(shí)，增加了對歷史數(shù)據(jù)歸檔等功能。 再次，利用當(dāng)前廣泛應(yīng)用的WCF技術(shù)和REST架構(gòu)，開發(fā)了本研究的三維網(wǎng)絡(luò)發(fā)布軟件，文中給出了實(shí)現(xiàn)的過程和部分關(guān)鍵代碼。 最終，在以上基礎(chǔ)上，設(shè)計(jì)了三維建筑數(shù)據(jù)的調(diào)度策略，利用網(wǎng)格與KD樹對模型進(jìn)行索引，采用多線程技術(shù)實(shí)現(xiàn)了三維模型顯示的并行處理，使用緩存技術(shù)減少了系統(tǒng)與數(shù)據(jù)庫的交互，研發(fā)了海量三維建筑物可視化系統(tǒng)，通過實(shí)驗(yàn)方案對系統(tǒng)性能進(jìn)行了評測，評測結(jié)果表明技術(shù)方案正確、可行。
[Abstract]:With the development of digital earth, digital city and digital community, mass 3D model visualization technology has become an important direction of current development. It is the first problem that needs to be solved at present. In this paper, for the purpose of visualization of massive 3D model, the research is carried out on the city 3D building, starting with the processing, management, scheduling and so on of 3D model data. Build a global-based three-dimensional building visualization system. First of all, the data content of the city 3D model is analyzed, and the research object is defined. Through the analysis of the structure of the urban 3D building model, according to the demand of the system function, A new 3D model data structure is defined. LOD model technology is used in the system. The geometric data and texture data of the model are simplified, and the half-edge folding mesh simplification algorithm is used to simplify the geometric data. The texture data is compressed by wavelet algorithm, both of which reduce the pressure of data storage and network transmission. Secondly, by meshing the earth's surface, the global three-dimensional building data management is transformed into the three-dimensional building data management in a single grid, and the database organization and management of the three-dimensional building in a single grid are carried out, and the database table is designed. At the same time, considering the management of temporal data, the basic functions of database are realized, and the functions of archiving historical data are added. Thirdly, using the widely used WCF technology and REST architecture, the 3D network publishing software is developed in this paper. The implementation process and some key codes are given in this paper. Finally, on the basis of above, the scheduling strategy of 3D building data is designed, the model is indexed by grid and KD tree, and the parallel processing of 3D model display is realized by multi-thread technology. The cache technology is used to reduce the interaction between the system and the database. A massive 3D building visualization system is developed. The performance of the system is evaluated by the experimental scheme. The evaluation results show that the technical scheme is correct and feasible.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：P208

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 杜曉暉;尹寶才;孔德慧;;基于加權(quán)二次誤差測度的邊折疊簡化算法[J];北京工業(yè)大學(xué)學(xué)報(bào);2007年07期

2 楊蕾，鄭慧民，楊揚(yáng);Mallat算法用于語音信號(hào)分析與壓縮[J];北京科技大學(xué)學(xué)報(bào);1996年01期

3 陳亮;陶宏才;;基于REST的Web服務(wù)Mashup研究與應(yīng)用[J];成都信息工程學(xué)院學(xué)報(bào);2008年05期

4 吳德華,毛先成,劉雨;三維空間數(shù)據(jù)模型綜述[J];測繪工程;2005年03期

5 鮑振洪;李朝奎;;城市建筑容積率研究進(jìn)展[J];地理科學(xué)進(jìn)展;2010年04期

6 易文根,韓波;A樹——一種新穎的空間數(shù)據(jù)索引方法[J];電腦與信息技術(shù);1996年03期

7 陶志剛,趙敬道,譚建成;地理空間索引技術(shù)研究[J];測繪學(xué)院學(xué)報(bào);2002年01期

8 駱斌,費(fèi)翔林;多線程技術(shù)的研究與應(yīng)用[J];計(jì)算機(jī)研究與發(fā)展;2000年04期

9 肖偉器，馮玉才，肖大海;地圖數(shù)據(jù)庫中的空間索引[J];計(jì)算機(jī)工程與應(yīng)用;1995年02期

10 羅琪,李軍,陳犖;基于GIS平臺(tái)的R樹索引模型研究與實(shí)現(xiàn)[J];計(jì)算機(jī)工程與科學(xué);2003年06期

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