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Research on the Observer-Orientation-Based Direction Relation Model and Query Method

Author: ZuoJiYun
Tutor: DengChengYu
School: Yanshan University
Course: Computer Software and Theory
Keywords: Spatial database The direction of the relationship Direction queries Blur direction Based on observer orientation
CLC: TP311.131
Type: Master's thesis
Year: 2010
Downloads: 45
Quote: 0
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Abstract


Direction relations often as a spatial database query selected conditions . Plays a very important role in the field of multimedia databases , artificial intelligence , virtual reality , city guides are based on the the observer azimuth direction relationship , but still relatively little research based on the the observer azimuth direction of the relational model and its query methods currently also not formed a complete theoretical system . First , the basic theory of the direction of the relationship and the direction of the relationship model , the direction of the relationship of quantitative models and qualitative direction relations model summary and analysis . Based on the traditional direction relational model , from the point of view of the observer , the observer azimuth direction based on the relational model , and to define the direction of the relationship based on observer orientation , redrawing the direction of the region based on the visual characteristics of the observer , lists two different size direction predicate and theory to prove their completeness . Second, accurate model can not express the uncertainty in the direction of the relationship , combining the fuzzy set theory , introduction of fuzzy thinking in a relational model based on the direction of the observer orientation , blur region boundaries of the direction of the relationship , a relationship model based on the observer orientation fuzzy direction each direction of the area defined fuzzy membership function and prove their completeness . Finally, when the observer azimuth range query algorithm is applied to low query efficiency , a large number of filtering shortcomings relationship based on exact model and fuzzy model based on observer azimuth direction , improved R * - tree indexing method is proposed based on direction of the observer orientation relationship the precise query algorithms and fuzzy query algorithms , I / O cost analysis of these two algorithms , and spatial query experimental set different parameters , the query performance of the algorithm .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer software > Program design,software engineering > Programming > Database theory and systems > Database theory
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