Enhanced global positioning system and map navigation process

  • US 6,415,227 B1
  • Filed: 04/07/2000
  • Issued: 07/02/2002
  • Est. Priority Date: 04/21/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. An enhanced global positioning system and map navigation process, comprising said steps of:

  • (a) receiving a measured position from a global positioning system receiver;

    (b) retrieving geospatial data from a geospatial map database based on said measured position from said global positioning system receiver by using a tile index file, wherein said tile index file stores geographic extent information of tiles which are geographically subdividing a coverage solely for a purpose of enhancing data management;

    wherein a geographic extent of an access area is compared with said geographic extent of said tiles to derive a plurality of involved tiles for said access area;

    (c) performing time-space filtering based on said measured position and said retrieved geospatial data from said geospatial map database to derive a displaying position for a user;

    wherein said measured position and a previous position and a previous velocity are used to derive a true position for said user; and

    (d) displaying a trajectory of said user on a graphic displaying unit, which tracks a motion of said user.

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