基于三維虛擬地球的海洋環(huán)境數(shù)據(jù)動態(tài)可視化研究
發(fā)布時間：2019-06-22 07:43
【摘要】：隨著“數(shù)字地球”、“數(shù)字海洋”等信息化建設的逐步深入推進,人們對于基于地理信息進行海洋信息多維動態(tài)可視化表達的應用需求顯著增加。海洋環(huán)境數(shù)據(jù)具有海量、多源、異構、數(shù)據(jù)格式多樣、多維、動態(tài)等特性,使得對海洋信息的處理與陸地GIS的處理方法大不相同。如何有效地組織、進而高效地多維動態(tài)可視化展示、表達這些海洋數(shù)據(jù),使人們能夠直觀地感受到海洋信息的內(nèi)容,是海洋信息可視化研究的關鍵技術之一。本文對陸海一體化混合地形渲染模型和面向過程建模的海洋時空過程數(shù)據(jù)模型研究的基礎上,基于真實DEM數(shù)據(jù)構建的三維虛擬地球,探討真實多維動態(tài)海洋環(huán)境數(shù)據(jù)的可視化思路及具體實現(xiàn)方法,設計并實現(xiàn)了面向服務架構的海洋三維可視化原型系統(tǒng),對相關關鍵技術問題進行了有效驗證。論文的主要工作和獲得的成果如下： (1)探討基于離散點集的海底DEM生成方法,形成由海洋離散水深點和相關特征點生成較高分辨率海底地形數(shù)據(jù)的完整流程；針對陸地、海底地形數(shù)據(jù)的空間尺度差異、分辨率差別等區(qū)別,以高效、快速、逼真的一體化三維展示為目標,設計多分辨率地形渲染模型的分層管理機制,提出基于四叉樹的改進混合型陸海地形表達模型,實現(xiàn)多種地形模型的統(tǒng)一整合渲染；研究任意形狀高分辨率地形數(shù)據(jù)的混合繪制算法,提高局部高精度地形的三維表達效果。 (2)綜合分析海洋環(huán)境數(shù)據(jù)特點和典型海洋環(huán)境時空數(shù)據(jù)模型的基礎上,針對三維虛擬地球中海洋時空數(shù)據(jù)的可視化需求,提出面向過程建模的海洋時空過程數(shù)據(jù)模型,為海洋時空過程的有效表達奠定基礎。采用網(wǎng)絡通用數(shù)據(jù)格式(Network Common Data Format, NetCDF)多維數(shù)據(jù)組織模型,研究基于NetCDF的海洋環(huán)境數(shù)據(jù)組織方法與存儲技術,實現(xiàn)海洋環(huán)境數(shù)據(jù)的統(tǒng)一描述和存儲管理,為海洋數(shù)據(jù)的高效管理、共享進行了有益的嘗試。 (3)基于三維虛擬地球,以海洋時空過程模型和NetCDF組織的多維海洋環(huán)境數(shù)據(jù)為基礎,研究海洋標量場數(shù)據(jù)的多模式、多種類可視化表達與分析方法,詳細論述海洋時空過程數(shù)據(jù)的點、線、面、體過程動態(tài)可視化,重點研究了基于圖形處理器(Graphic Processor Unit, GPU)加速的光線投射體繪制方法；實現(xiàn)三維虛擬地球中標量場數(shù)據(jù)的剖面繪制、等值線繪制以及等值面繪制等,同時,基于時間插值討論了海洋時空過程在時間維的連續(xù)平滑可視化。另外,基于改進的三維箭頭點圖標繪制方法實現(xiàn)三維虛擬地球中矢量場的高效動態(tài)可視化。在三維虛擬地球中通過多種方式的可視化表達和分析,直觀、形象地展示了海洋要素和現(xiàn)象的時空分布和變化情況,為揭示海洋現(xiàn)象的規(guī)律和特征提供了可視化途徑。 (4)依托現(xiàn)有三維地理信息可視化平臺構建面向服務的海洋三維可視化原型系統(tǒng),基于本文的相關研究,實現(xiàn)陸�；A地理空間數(shù)據(jù)和海洋環(huán)境數(shù)據(jù)的一體化三維展示與分析,通過一些典型數(shù)據(jù)的可視化應用實驗,對本文所提理論、技術和方法進行了驗證。
[Abstract]:With the development of "digital earth", "digital ocean" and other information-based construction, there is a significant increase in the application demand of multi-dimensional dynamic visual representation of ocean information based on geographic information. The marine environment data has the characteristics of mass, multi-source, heterogeneous, data format, multi-dimensional, dynamic and so on, so that the processing method of the ocean information is very different from that of the land GIS. It is one of the key technologies in the research of ocean information visualization. In this paper, on the basis of the study of the land-sea integrated terrain rendering model and the model-oriented ocean space-time process data model, a three-dimensional virtual earth constructed on the basis of the real DEM data is presented, and the visualization of the real multi-dimensional dynamic marine environment data and the concrete implementation method are discussed. The three-dimensional visual prototype system for the service-oriented architecture is designed and implemented, and the relevant key technology problems are effectively verified. The main work and achievements of the paper are as follows: (1) a method for generating a submarine DEM based on a discrete point set is explored to form a complete flow of high-resolution seabed terrain data generated by a marine discrete water depth point and an associated feature point; and In this paper, the spatial scale difference and the resolution difference of the submarine topography data are distinguished, and the hierarchical management mechanism of the multi-resolution terrain rendering model is designed based on the three-dimensional display of high efficiency, fast and vivid integration, and the improved hybrid land-sea terrain expression model based on the quadtree is proposed. The uniform and complete rendering of a variety of terrain models is realized; the hybrid rendering algorithm of high-resolution terrain data of any shape is studied, and the three-dimensional expression effect of the local high-precision terrain is improved (2) Based on the comprehensive analysis of the data characteristics of the marine environment and the spatial and temporal data model of the typical marine environment, the number of time-and-space processes for the process modeling is proposed for the visual demand of the temporal and spatial data of the ocean in the three-dimensional virtual earth. According to the model, it is an effective expression of the time-space process of the ocean. Based on the multi-dimensional data organization model of the Network Common Data Format (NetCDF), the data organization method and storage technology of the marine environment based on the NetCDF are studied, and the unified description and storage management of the marine environment data is realized, which is beneficial to the efficient management and sharing of the marine data. (3) Based on the three-dimensional virtual earth, on the basis of the ocean space-time process model and the multi-dimensional marine environment data of the NetCDF organization, the multi-mode, multi-type visual expression and analysis method of the ocean scalar field data are studied, and the data of the time-space process of the ocean are discussed in detail. The dynamic visualization of point, line, surface and body process is focused on the method of drawing the ray projection based on the accelerated graphics processor (GPU); the section drawing, the contour drawing and the equivalent surface drawing of the scalar field data in the three-dimensional virtual earth are realized. At the same time, based on time interpolation, the continuity of time-and-space process in the time dimension is discussed. in addition, that high efficiency of the vector field in the three-dimensional virtual earth is realized based on the improved three-dimensional arrow point icon drawing method, In the three-dimensional virtual earth, the spatial and temporal distribution and the change of the ocean elements and phenomena are displayed by visual expression and analysis in a variety of ways, and the laws and characteristics of the ocean phenomena are provided. and (4) building a service-oriented ocean three-dimensional visualization prototype system on the basis of the existing three-dimensional geographic information visualization platform, Three-dimensional display and analysis, through the visualization application experiment of some typical data, the theory, technology and
【學位授予單位】：遼寧工程技術大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：P208
本文編號：2504380
[Abstract]:With the development of "digital earth", "digital ocean" and other information-based construction, there is a significant increase in the application demand of multi-dimensional dynamic visual representation of ocean information based on geographic information. The marine environment data has the characteristics of mass, multi-source, heterogeneous, data format, multi-dimensional, dynamic and so on, so that the processing method of the ocean information is very different from that of the land GIS. It is one of the key technologies in the research of ocean information visualization. In this paper, on the basis of the study of the land-sea integrated terrain rendering model and the model-oriented ocean space-time process data model, a three-dimensional virtual earth constructed on the basis of the real DEM data is presented, and the visualization of the real multi-dimensional dynamic marine environment data and the concrete implementation method are discussed. The three-dimensional visual prototype system for the service-oriented architecture is designed and implemented, and the relevant key technology problems are effectively verified. The main work and achievements of the paper are as follows: (1) a method for generating a submarine DEM based on a discrete point set is explored to form a complete flow of high-resolution seabed terrain data generated by a marine discrete water depth point and an associated feature point; and In this paper, the spatial scale difference and the resolution difference of the submarine topography data are distinguished, and the hierarchical management mechanism of the multi-resolution terrain rendering model is designed based on the three-dimensional display of high efficiency, fast and vivid integration, and the improved hybrid land-sea terrain expression model based on the quadtree is proposed. The uniform and complete rendering of a variety of terrain models is realized; the hybrid rendering algorithm of high-resolution terrain data of any shape is studied, and the three-dimensional expression effect of the local high-precision terrain is improved (2) Based on the comprehensive analysis of the data characteristics of the marine environment and the spatial and temporal data model of the typical marine environment, the number of time-and-space processes for the process modeling is proposed for the visual demand of the temporal and spatial data of the ocean in the three-dimensional virtual earth. According to the model, it is an effective expression of the time-space process of the ocean. Based on the multi-dimensional data organization model of the Network Common Data Format (NetCDF), the data organization method and storage technology of the marine environment based on the NetCDF are studied, and the unified description and storage management of the marine environment data is realized, which is beneficial to the efficient management and sharing of the marine data. (3) Based on the three-dimensional virtual earth, on the basis of the ocean space-time process model and the multi-dimensional marine environment data of the NetCDF organization, the multi-mode, multi-type visual expression and analysis method of the ocean scalar field data are studied, and the data of the time-space process of the ocean are discussed in detail. The dynamic visualization of point, line, surface and body process is focused on the method of drawing the ray projection based on the accelerated graphics processor (GPU); the section drawing, the contour drawing and the equivalent surface drawing of the scalar field data in the three-dimensional virtual earth are realized. At the same time, based on time interpolation, the continuity of time-and-space process in the time dimension is discussed. in addition, that high efficiency of the vector field in the three-dimensional virtual earth is realized based on the improved three-dimensional arrow point icon drawing method, In the three-dimensional virtual earth, the spatial and temporal distribution and the change of the ocean elements and phenomena are displayed by visual expression and analysis in a variety of ways, and the laws and characteristics of the ocean phenomena are provided. and (4) building a service-oriented ocean three-dimensional visualization prototype system on the basis of the existing three-dimensional geographic information visualization platform, Three-dimensional display and analysis, through the visualization application experiment of some typical data, the theory, technology and
【學位授予單位】：遼寧工程技術大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：P208
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