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United States of America Patent
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Jun 8, 2004
Grant Date -
Feb 5, 2004
app pub date -
Jul 31, 2002
filing date -
Jul 31, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A technique for displaying topographical data, for example, on a screen of a portable hand-held device includes: optionally receiving GPS (Global Positioning System) signals and generating a digital output indicative of a position location of the display device in response to the received GPS signals or inputting location data manually to produce an image on a display screen of the device in response to the digital output; and storing true digital elevation data as compressed cells and decompressing on-the-fly only data needed to provide elevation data for an image area displayed on the display screen.
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