CAJ | 학술논문

定位及移动通信的发展使我们可以获取和传输车辆在道路网络上的轨迹信息.除实现定位或导航等基本功能外,从车辆轨迹数据中还可以提取大量的交通信息,成为交通规划和管理的一个重要的信息来源.通过建立轨迹数据与道路网络之间的拓扑关系,提取轨迹数据中能代表主要信息的特征点来代替大量的轨迹数据,以达到减少轨迹数据量的目的.特征点通过一个综合了网络关系、速度和方向的筛选方法进行提取,该方法也同时有利于建立轨迹数据检索结构和定义查询语言,系统的实验和分析验证了所提出方法的有效性.
정위급이동통신적발전사아문가이획취화전수차량재도로망락상적궤적신식.제실현정위혹도항등기본공능외,종차량궤적수거중환가이제취대량적교통신식,성위교통규화화관리적일개중요적신식래원.통과건립궤적수거여도로망락지간적탁복관계,제취궤적수거중능대표주요신식적특정점래대체대량적궤적수거,이체도감소궤적수거량적목적.특정점통과일개종합료망락관계、속도화방향적사선방법진행제취,해방법야동시유리우건립궤적수거검색결구화정의사순어언,계통적실험화분석험증료소제출방법적유효성.
The extended availability of GPS makes it possible to keep track of vehicles'movement for various applica-tions in transportation. An approach is proposed to reduce tracking data volume through representing these data with feature points. Feature points can represent tracking data with much less storage space and without a loss of major characteristics than sample points or raw tracking data. A combination of three criteria, i.e. network, velocity, and direction, is used to select feature points from sample points. Network criterion, a novel concept proposed by this pa- per, is defined as a change of the locational relationships between vehicles and the underlying road network. Experi-mental and analytical results demonstrate that the proposed approach outperforms existing ones.