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Method and system for compressing data and a geographic database formed therewith and methods for use thereof in a navigation application program

  • US 6,768,818 B2
  • Filed: 06/17/2003
  • Issued: 07/27/2004
  • Est. Priority Date: 09/17/1998
  • Status: Expired due to Term
First Claim
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1. A compression format for storing a collection of data on a medium, wherein said data are required to be decompressed to an uncompressed form in order to use the data for performing functions, the compression format comprising:

  • an arrangement of said collection of data wherein said collection is separated into a plurality parcels each of which includes a plurality of data items which form at least part of said collection, wherein said plurality of data items in each parcel are accessed together as a group in a given sequence; and

    a plurality of substitution codes included among said arrangement of a plurality of data items, each of said plurality of substitution codes including an offset from a position in said arrangement of a plurality of data items at which said substitution code is located into a position sequentially backwards therefrom.

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