| 基于对象方位的连续方向查询的优化技术 |
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| 引用本文： | 马永强,马丽莉.基于对象方位的连续方向查询的优化技术[J].焦作大学学报,2006,20(2):64-66. |
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| 作者姓名： | 马永强 马丽莉 |
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| 作者单位： | 1. 河南理工大学,河南,焦作,454000
2. 焦作大学,河南,焦作,454003 |
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| 摘 要： | 连续方向查询中的结果是包含有效时域的,传统的拓扑运算无法计算出连续方向查询结果的有效时域。连续方向查询的传统处理方法是当结果发生变化时,重复执行方向查询,这种频繁的查询导致系统的消耗的增加。基于这种情况,文章提出了扩展的开放区域和相对坐标系的算法,就是先用扩展的开放区域计算出方向查询的结果,进行平移旋转,转化为相对坐标系内的坐标。
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| 关 键 词： | 方向 扩展的开放区域 基于对象方位的方向查询 连续方向查询 |
| 文章编号： | 1008-7257(2006)02-0064-03 |
| 收稿时间： | 10 13 2005 12:00AM |
| 修稿时间： | 2005年10月13 |
The Object-Orientation-based Continuous Direction Query Optimization |
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| MA Yongqiang,MA Lili.The Object-Orientation-based Continuous Direction Query Optimization[J].Journal of Jiaozuo University,2006,20(2):64-66. |
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| Authors: | MA Yongqiang MA Lili |
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| Institution: | 1, Henan Polytechnic University, Jiaozuo 454000 ;2. Jiaozuo University, Jiaozuo 454003, China |
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| Abstract: | To the continuous direction query,its result is time stamp. The pological operations between open shapes and closed geometry objects do not compute time interval. In this paper we propose extended open-shapes strategy and TranslateRotate strategy, Using extended open-shapes strategy,we require the results which slaisfy query condition,and with translaterotating the results in the relative coordinates system we compute the valid time interval of result set. Finally the strategy rapidly implement the continuous query of moving object. The experiment demonstrates that extended open shape strategy performs repeated direction query strategy in I/O cost. |
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| Keywords: | Direction Extended Open shape Object-Orientation-based Direction Query Continuous Direction Query |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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