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    • 11. 发明申请
    • Navigation system
    • 导航系统
    • US20080021638A1
    • 2008-01-24
    • US11826700
    • 2007-07-17
    • Tomokazu Kobayashi
    • Tomokazu Kobayashi
    • G01C21/26G06F17/30
    • G01C21/30
    • A service-area road that is a road in a service area such as a rest area or parking area of an expressway is determined to be a road on which a vehicle travels on when the following three conditions are satisfied. A first condition is satisfied when the vehicle travels in an expressway. A second condition is satisfied when a main road of the expressway and the service-area road are designated as candidate roads in map matching process. A third condition is satisfied when a difference between the heading direction of the vehicle and the traffic direction of the main road is equal to or greater than a predetermined value. Thus, it can be as promptly as possible determined that the vehicle is traveling on the service-area road, allowing the vehicle mark to be accurately displayed on the service-area road on the displayed map.
    • 作为在高速公路的休息区域或停车场等的服务区域的道路的服务区域道路被确定为当满足以下三个条件时车辆行驶的道路。 当车辆在高速公路上行驶时,满足第一条件。 高速公路和服务区道路的主干道在地图匹配处理中被指定为候补道路时,满足第二条件。 当车辆的行进方向与主干道的交通方向之间的差异等于或大于预定值时,满足第三条件。 因此,可以尽可能快地确定车辆在服务区域道路上行驶,允许车辆标记在所显示的地图上的服务区域道路上准确地显示。