Method and system for storage and fast retrieval of digital...

Details Method and system for storage and fast retrieval of digital... Method and system for storage and fast retrieval of digital...

2006-01-10

2006-01-10

Ali, Mohammad (Department: 2167)

Data processing: database and file management or data structures

Database design

Data structure types

C701S301000, C382S285000

Reexamination Certificate

active

06985903

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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patent: 6757445 (2004-06-01), Knopp
patent: 2004/0075738 (2004-04-01), Burke et al.

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