发明授权
US08032155B2 Method of applying a spherical correction to map data for rendering direction-of-travel paths on a wireless communications device
有权
将球面校正应用于在无线通信设备上绘制行驶路线路线的地图数据的方法
- 专利标题: Method of applying a spherical correction to map data for rendering direction-of-travel paths on a wireless communications device
- 专利标题(中): 将球面校正应用于在无线通信设备上绘制行驶路线路线的地图数据的方法
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申请号: US11626605申请日: 2007-01-24
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公开(公告)号: US08032155B2公开(公告)日: 2011-10-04
- 发明人: Gerhard Dietrich Klassen , David Yach
- 申请人: Gerhard Dietrich Klassen , David Yach
- 申请人地址: CA Waterloo, Ontario
- 专利权人: Research In Motion Limited
- 当前专利权人: Research In Motion Limited
- 当前专利权人地址: CA Waterloo, Ontario
- 主分类号: H04W24/00
- IPC分类号: H04W24/00 ; G01C21/00
摘要:
Displaying a map on a wireless communications device includes steps of obtaining map data for rendering the map to be displayed on the wireless communications device, determining a rotation that, when applied to the map, will orient a selected path in a selected direction, such as a current direction of travel, generating a corrected rotation by applying a spherical correction factor, e.g. based on a current location, and rendering the map on a display of the wireless communications device by applying the corrected rotation. The spherical correction factor corrects for map distortions that occur at high latitudes for paths that are neither purely north-south or east-west. When such a path is rotated to face upward to show direction of travel, the path needs to be straightened by applying the spherical correction factor.
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