本文選題：虛擬月球 + 海量數(shù)據(jù)��； 參考：《天津理工大學(xué)》2013年碩士論文

【摘要】：借助于嫦娥一號星載CCD相機(jī)和激光高度計等設(shè)備，我們獲得了描述月表形貌特征的海量月表地形數(shù)據(jù)。為此本文主要研究構(gòu)建多尺度月表地形三維模型的若干關(guān)鍵技術(shù)，包括全月球海量地形數(shù)據(jù)的組織與管理、多尺度月表地形數(shù)據(jù)模型結(jié)構(gòu)建立、月表地形數(shù)據(jù)實時渲染、三維月表地形的查詢與漫游，在此基礎(chǔ)上設(shè)計并實現(xiàn)三維月表地形的實時渲染仿真系統(tǒng)。本論文的主要成果與創(chuàng)新可以概括如下： 1、基于小波建立四叉樹結(jié)構(gòu)對海量月表地形數(shù)據(jù)進(jìn)行空間的月表地形數(shù)據(jù)的分塊組織，，結(jié)合大型數(shù)據(jù)庫管理系統(tǒng)對二進(jìn)制的數(shù)據(jù)流的存儲和組織特點，以及月表地形數(shù)據(jù)塊的位置編碼創(chuàng)建其索引機(jī)制。同時采用并行調(diào)度策略實現(xiàn)數(shù)據(jù)庫服務(wù)器到終端機(jī)的月表地形數(shù)據(jù)的加載以及兩者間的數(shù)據(jù)交換。實現(xiàn)了海量月表地形數(shù)據(jù)的存儲、管理和動態(tài)裝載。 2、對采用上述策略動態(tài)加載到前端頁面緩沖區(qū)的月表地形數(shù)據(jù)采用非規(guī)則動態(tài)三角網(wǎng)格法構(gòu)建多尺度月表地形模型。將Mipmap技術(shù)與紋理壓縮算法相結(jié)合，構(gòu)建了多尺度月表地形的紋理模型。 3、基于本文提出的數(shù)據(jù)的快速調(diào)度(或稱索引)和快速渲染技術(shù)構(gòu)建一個快速精確的渲染引擎，實現(xiàn)全月球地形數(shù)據(jù)的可視化，結(jié)合LOD技術(shù)的數(shù)據(jù)存取機(jī)制實現(xiàn)了海量月表三維地形景觀的實時渲染和漫游，實驗表明已達(dá)到60幀/秒以上的渲染速度。 4、最后采用空間三次樣條曲線理論構(gòu)建視點運動軌跡的控制算法，實現(xiàn)對月表地形不同地點之間的實時查詢。
[Abstract]:With the aid of Chang 'e-1 spaceborne CCD camera and laser altimeter, we have obtained massive topographic data describing the features of lunar surface topography. For this reason, this paper mainly studies some key technologies of constructing the multi-scale monthly surface terrain 3D model, including the organization and management of the lunar massive topographic data, the establishment of the multi-scale monthly surface terrain data model structure, and the real-time rendering of the monthly surface topographic data. On the basis of the query and roaming of 3D lunar surface terrain, a real-time rendering simulation system is designed and implemented. The main achievements and innovations of this paper can be summarized as follows: 1. Based on wavelet, the quadtree structure is established to organize the spatial monthly topographic data of massive monthly table, combining with the characteristics of storing and organizing binary data stream in large database management system. And the location coding of the topographic data block of the monthly table to create its indexing mechanism. At the same time, the parallel scheduling strategy is used to realize the loading of the monthly topographic data from the database server to the terminal and the data exchange between the two. The storage, management and dynamic loading of massive monthly topographic data are realized. 2. For the monthly topographic data which is dynamically loaded into the front page buffer by the above strategy, the multi-scale monthly table terrain model is constructed by using the irregular dynamic triangular grid method. The texture model of multi-scale monthly table terrain is constructed by combining Mipmap technology with texture compression algorithm. 3. Based on the data fast scheduling (or index) and fast rendering technology proposed in this paper, a fast and accurate rendering engine is constructed to realize the visualization of lunar terrain data. Combined with the data access mechanism of LOD technology, the real-time rendering and roaming of massive monthly table 3D terrain and landscape are realized. The experimental results show that the rendering speed is over 60 frames per second. Finally, the control algorithm of view trajectory is constructed by using spatial cubic spline curve theory, and the real-time query between different locations of the lunar surface terrain is realized.
【學(xué)位授予單位】：天津理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：P184;TP391.41

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本文編號：1809646