Method and system for storage and fast retrieval of digital terrain model elevations for use in positioning systems
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United States of America Patent
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Jan 10, 2006
Grant Date -
Jul 31, 2003
app pub date -
Jan 25, 2002
filing date -
Jan 25, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Methods and apparatuses to generate and to access compressed and indexed elevations of Digital Elevation Models. In one aspect of the invention, a method to store elevation data includes: compressing elevation data of a first portion of a Digital Elevation Model (DEM) to generate first compressed elevation data; storing the first compressed elevation data in a storage location pointed to by a first index; and storing the first index. In another aspect of the invention, a method to retrieve elevation data includes: locating a first compressed portion of a Digital Elevation Model (DEM) using a first index; and decompressing the first compressed portion to retrieve first elevation data for at least one sample point in the Digital Elevation Model. The Digital Elevation Model has a plurality of compressed portions which includes the first compressed portion; and the first index points to a storage location where the first compressed portion is stored.
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Cited Art Landscape
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