摘要
Direction is a common spatial concept that is used in our daily life. It is frequently used as a selection condition in spatial queries. As a result, it is important for spatial databases to provide a mechanism for modeling and processing direction queries and reasoning. Depending on the direction relation matrix, an inverted direction relation matrix and the concept of direction pre- dominance are proposed to improve the detection of direction relation between objects. Direction predicates of spatial systems are also extended. These techniques can improve the veracity of direction queries and reasoning. Experiments show excellent efficiency and performance in view of direction queries.
Direction is a common spatial concept that is used in our daily life. It isfrequently used as a selection condition in spatial queries. As a result, it is important forspatial databases to provide a mechanism for modeling and processing direction queries andreasoning. Depending on the direction relation matrix, an inverted direction relation matrix and theconcept of direction pre- dominance are proposed to improve the detection of direction relationbetween objects. Direction predicates of spatial systems are also extended. These techniques canimprove the veracity of direction queries and reasoning. Experiments show excellent efficiency andperformance in view of direction queries.
基金
FundedbyHi techResearchandDevelopmentProgramofChina (No.2 0 0 1AA1 351 90 0 2 )
