Patent · US Active

Real-time spherical correction of map data

US7881562B2 · kind B2 · utility

2Cited by

4References

19Claims

0Family size

Assignee

RESEARCH IN MOTION LIMITED · CA

Inventors

Gordon Gregory Bowman · Kemptville, CA
Gerhard Dietrich Klassen · Waterloo, CA

Key dates

Filing date	Jan 26, 2007
Grant date	Feb 1, 2011
Priority date	—
Expiry date	Dec 3, 2029

Classification

Technology area (CPC G)Physics
CPC primaryG09G2340/145
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

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 3×3 transformation matrix, this spherical correction can be easily applied without taxing the CPU limitations of small handheld devices.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.