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    • 10. 发明授权
    • System and method for advanced 3D visualization for mobile navigation units
    • 用于移动导航单元的高级3D可视化的系统和方法
    • US06885939B2
    • 2005-04-26
    • US10334772
    • 2002-12-31
    • Hauke SchmidtTuolin ChenAaron Lee
    • Hauke SchmidtTuolin ChenAaron Lee
    • G01C21/34G01C21/36G06T17/05G09B29/10G01C21/26G09G5/00
    • G01C21/3638G06F17/30241G06F17/30905G06T17/05G06T2210/61G09B29/10
    • A system providing three-dimensional visual navigation for a mobile unit includes a location calculation unit for calculating an instantaneous position of the mobile unit, a viewpoint control unit for determining a viewing frustum from the instantaneous position, a scenegraph manager in communication with at least one geo-database to obtain geographic object data associated with the viewing frustum and generating a scenegraph organizing the geographic object data, and a scenegraph renderer which graphically renders the scenegraph in real time. To enhance depiction, a method for blending images of different resolutions in the scenegraph reduces abrupt changes as the mobile unit moves relative to the depicted geographic objects. Data structures for storage and run-time access of information regarding the geographic object data permit on-demand loading of the data based on the viewing frustum and allow the navigational system to dynamically load, on-demand, only those objects that are visible to the user.
    • 一种为移动单元提供三维视觉导航的系统包括用于计算移动单元的瞬时位置的位置计算单元,用于从瞬时位置确定观看平截头体的视点控制单元,与至少一个 地理数据库,以获得与观察平截头体相关联的地理对象数据并生成组织地理对象数据的场景图,以及以图形方式实时渲染场景图的场景渲染器。 为了增强描绘,用于在场景图中混合不同分辨率的图像的方法减少了随着移动单元相对于所描绘的地理对象移动而的突然变化。 用于存储和运行时访问关于地理对象数据的信息的数据结构允许基于查看平截头体的数据的按需加载,并允许导航系统按需地动态地加载那些对于 用户。