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Method of generating map update process data, map update method, and map update apparatus

  • US 7,490,006 B2
  • Filed: 02/07/2006
  • Issued: 02/10/2009
  • Est. Priority Date: 02/10/2005
  • Status: Expired due to Fees
First Claim
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1. A method of generating map update process data used for updating old map data including a plurality of files to new map data on a file-by-file basis, the method comprising the steps of:

  • using an old map file to be updated and a new map file to generate differential data;

    calculating a relative size of the differential data with respect to the size of a map file; and

    using the new map file if the relative size is higher than a predetermined value and using the differential data if the relative size is lower than the predetermined value to form the map update process data.

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