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| 有向线对象细节拓扑关系模型 | |
| 引用本文： | 向隆刚, 陶强强, 吴涛. 语义关联的轨迹-有向线移动过程模型及查询分析[J]. 武汉大学学报 ( 信息科学版), 2016, 41(8): 1034-1039, 1045. DOI: 10.13203/j.whugis20140407 |
| 作者姓名： | 向隆刚 陶强强 吴涛 |
| 作者单位： | 1.武汉大学测绘遥感信息工程国家重点实验室, 湖北 武汉, 430079;2.中南大学地球科学与信息物理学院, 湖南 长沙, 410083 |
| 基金项目： | 国家自然科学基金（41471374，41001296） |
| 摘 要： |  轨迹在地理空间中相对一条有向线移动时，可能发生多次进入、离开、穿过、相遇、折返、停留等拓扑关系。针对轨迹-有向线的时空关联特征，提出语义关联的轨迹-有向线移动过程模型:基本思路是将轨迹-有向线的复杂拓扑细节描述为若干局部拓扑关系的组合，从拓扑和语义的角度描述轨迹相对于有向线的移动过程。  最后设计并实现了面向该模型的关系模式，并以两类典型请求为例，分析了轨迹-有向线移动过程的纯SQL查询分析技术。  |
| 关 键 词： | 轨迹 有向线 九交模型 语义矩阵 SQL |
| 收稿时间： | 2014-09-12 |
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| XIANG Longgang, TAO Qiangqiang, WU Tao. A Semantics Associated Model for Trajectory-directed Line Movement and Its SQL Analysis[J]. Geomatics and Information Science of Wuhan University, 2016, 41(8): 1034-1039, 1045. DOI: 10.13203/j.whugis20140407 | |
| Authors: | XIANG Longgang TAO Qiangqiang WU Tao |
| Affiliation: | 1.State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China;2.School of Geosciences and Info-Physics, Central South University, Changsha 410083, China |
| Abstract: | Trajectories move relative to directed lines, incurring topological events of various kinds, such as entries, departures, crosses, meets, retracements, stops and so on. Based on the spatial-temporal characteristics of trajectory-directed line movements a semantic associated model of trajectory-directed line movement is proposed, Our strategy depicts complex detailed topological relations between trajectories and directed lines by combining sets of local topological relations. In this way, movements of trajectories with respect to directed lines can be specified from the perspective of both topology and semantics. A relational schema based on this model was designed and evaluated in for two cases of typical queries types and analyzing trajectory-directed line movement by exploring pure SQL statements. |
| Keywords: | trajectory directed line nine-intersection model semantics matrix SQL |
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