【摘要】 卫星遥感图与城市路网配准后,可用于交通仿真和车辆态势显示。现代城市路网不包含立交桥层次信息,为真实模拟车辆在立交桥的行驶效果,提出了一种基于GPS数据识别立交桥并判断其上下关系的算法。该算法首先计算线段交点来识别立交桥,其次判断上下层是否连通来区分其类型,再将GPS轨迹数据与路网匹配,通过分析GPS高度数据的变化趋势来判断立交桥层次。最后在成都市路网上对算法的有效性进行了验证,实验结果表明,路网立交桥判定快捷,上下层关系区分正确。更多还原

【Abstract】 Satellite remote sensing image which has been matched with urban road network is applied to Traffic simulation and vehicle situation displaying.Urban road network is short of overpass level information.To simulate the real scene which the car travels on overpass,an algorithm based on GPS data is proposed.The algorithm identify overpass and distinguish the hierarchy.First it identify road network overpass by the intersection finding of line segment,second it determine its type according to the road adjacent information,once again it match road network with GPS track data and distinguish the hierarchy from the variation trend of GPS height data.Finally,an experiment on Chengdu city road network is performed to validate the algorithm,and the experimental result shows that road network overpass recognition is respectably quick and the hierarchy distinction is very correct.更多还原