摘要： 扩展开放区域的基本抽象类，提出了开放梯形和开放扇形的概念，利用扩展的开放区域理论对空间对象的方向关系进行建模，给出定量方向关系查询的解决方法，并扩展绝对参考框架下定量方向关系查询技术的通用性应用于不同参考框架下的定量和定性的方向关系查询处理，实验证明该技术与传统范围查询方法相比在性能上的优势。
关键词:
开放区域,
方向关系,
定量查询
Abstract: This paper extends the basic abstract class of open shape and puts forward concepts of open trapezoid and open sector. It models on the direction relation of spatial object based on theory of extended open shape, and extends the current technology into the direction relations queries under the different reference frameworks. Experiments demonstrate the advantages of the technology in performance compared with traditional range query methods.
Key words:
open shape,
direction relations,
quantitative query
中图分类号:
石 静;刘永山. 基于开放区域的定量方向关系查询技术[J]. 计算机工程, 2007, 33(22): 89-91,9.
SHI Jing; LIU Yong-shan. Quantitative Direction Relations Query Technology Based on Open Shape[J]. Computer Engineering, 2007, 33(22): 89-91,9.