博碩士論文 90522047 詳細資訊




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姓名 陳尚哲(Shang-Che Chen)  查詢紙本館藏   畢業系所 資訊工程學系
論文名稱 以SEDRIS為基礎的虛擬環境建構與查詢
(SEDRIS-based Virtual Environment Construction and Query)
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摘要(中) 3D視覺化及動態模擬技術可以讓人們更方便、更有效率地以電腦模擬的方式來探求新知。當我們將此技術與地理空間資訊及物件屬性資料結合在一起時,即可創造出一個有效率的動態虛擬環境。這樣的環境將可應用於環境展示系統、軍事模擬系統及三維地理資訊系統中。
地理空間資訊及物件屬性資料的種類繁多且格式複雜,為了讓此虛擬環境中的模型及屬性資料能夠與其他系統的資料互通,且達到良好的應用效果,我們以SEDRIS的規範來創造此虛擬環境。
在SEDRIS中所規範的資料描述模式,主要是利用軟體工程的技術來清楚地描述、定義我們真實環境中的物件。我們將以此資料描述模式來描述虛擬環境中的3D物件及它們的屬性,並以此方法來建構3D的虛擬環境。
在本論文中,我們將以SEDRIS的應用程式介面系統及軟體發展工具集來開發以SEDRIS為基礎之虛擬環境的編輯器及瀏覽器。另外,對於3D地理資訊系統的應用,我們也開發一個屬性查詢子系統。
摘要(英) 3-D visualization technology offers facilitative and efficient functions to acquire new knowledge. The technology combining geographic information systems (GIS) provides replicating real-world objects maximizes the user’s experience within an interactive synthetic environment. Moreover, queries in GIS play an important role. Traditionally, queries are mainly in two-dimensional style. It will be a great challenge to directly present queries for GIS data within a 3-D synthetic environment.
In this paper, we presented a platform to construct a virtual environment using synthetic environment data representation and interchange specification (SEDRIS) and provide a system to query attributes of the objects contained in the virtual environment.
The data representation model of SEDRIS is a software engineering technique for unambiguously articulating information about the data within our real world. In this study, we will utilize this technique to unambiguously represent 3-D objects and its attributes to archive a virtual environment construction.
關鍵字(中) ★ 空間模塑
★ 虛擬環境建構
★ 查詢
★ 地理資訊系統
★ 虛擬實境
關鍵字(英) ★ 3D modeling
★ virtual reality
★ query
★ 3D GIS
★ virtual environment construction
論文目次 Abstract ii
Contents iii
List of Figures vi
List of Tables ix
Chapter 1 Introduction 1
1.1 Motivation 1
1.2 System overview 2
1.2.1 Manipulation of objects 2
1.2.2 Attribute query 3
1.3 Thesis organization 3
Chapter 2 Related Work 5
2.1 3-D urban model generation 5
2.1.1 Photogrammetry 5
2.1.2 Procedural generation 6
2.1.3 Street map and texture 8
2.2 3-D model data structure 8
2.2.1 3-D raster data 9
2.2.2 Constructive solid geometry 9
2.2.3 Boundary representation 10
2.3 Real-time rendering for large-scale scenery 11
2.3.1 Discrete structures 12
2.3.2 Continuous structures 14
Chapter 3 Acquisition of Terrain Models 16
3.1 Introduction to DTED 16
3.1.1 Specification 17
3.1.2 File descriptions 19
3.2 DEM to DTED transformation 19
3.2.1 Coordinate transformation 20
3.2.2 Procedure of transformation 21
3.2.3 Elevation interpolation 22
3.3 Multiresolution terrain modeling 23
3.3.1 Discrete multiresolution modeling 24
3.3.2 Continuous multiresolution modeling 24
Chapter 4 Integration of A Synthetic Environment 26
4.1 Introduction to SEDRIS 27
4.1.1 Purposes 27
4.1.2 Data representation model 28
4.1.3 Data interchange 33
4.1.4 Application programmer’s interface 34
4.2 Terrain representation in SEDRIS 35
4.2.1 DTED representation 36
4.2.2 PM representation 38
4.3 3-D models import 39
4.3.1 Model topology 39
4.3.2 Model representation 40
4.4 Environment restore 42
4.4.1 Matrix representation 42
4.4.2 Local matrix of models 42
Chapter 5 Query in A Virtual Environment 44
5.1 Interaction and manipulation 44
5.2 Query data for 3-D models 45
5.2.1 Geometric information 45
5.2.2 Thematic attributes 46
5.2.3 Attribute structure design 46
5.2.4 Attribute representation 47
Chapter 6 Experiments and Results 49
6.1 Experimental platform 49
6.2 System organization 49
6.2.1 Terrain model generation 50
6.2.2 3-D model integration 52
6.2.3 VE editor and VE viewer 53
6.2.4 Attribute query 58
Chapter 7 Conclusions 60
References 61
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指導教授 曾定章(Din-Chang Tseng) 審核日期 2003-7-4
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