发明名称 |
Real-time spherical correction of map data |
摘要 |
<p>A method of 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, generating corrected map data by applying a spherical correction factor to the obtained map data, and rendering the corrected map data to display the map on a display of the wireless communications device. The spherical correction factor corrects for map distortions that occur at northerly (or southerly) latitudes. Since the spherical correction factor is a simple correction to a 3X3 transformation matrix, this spherical correction can be easily applied without taxing the CPU limitations of small handheld devices.</p> |
申请公布号 |
EP1840517(B1) |
申请公布日期 |
2009.08.19 |
申请号 |
EP20070101281 |
申请日期 |
2007.01.26 |
申请人 |
RESEARCH IN MOTION LIMITED |
发明人 |
BOWMAN, GORDON GREGORY;KLASSEN, GERHARD D |
分类号 |
G01C21/32;G09B29/10 |
主分类号 |
G01C21/32 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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