Hand-held GPS-mapping device

  • US 5,987,380 A
  • Filed: 01/25/1999
  • Issued: 11/16/1999
  • Est. Priority Date: 11/19/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. A system for storing an image and viewing a portion of the image, comprising the steps of:

  • a) selecting an image,b) dividing the image into tiles,c) establishing geographical referencing of each tile in its physical relationship within the image,d) compressing the image of each tile,e) forming an output file of image data of all of the tiles, which, taken together, represent said image, said image data including;

    i) header data describing the size and geographical location of each tile,ii) pointers to the location, in the storage unit, of the data for each tile,iii) compressed tile data for each tile,f) storing the image data in the output file in an image storage unit adapted to store image data and to provide the image data to a computer,g) selecting a tile to view using the geographical referencing data,h) locating the tile image data of the said tile using the pointer, andi) decompressing the tile image data of the said tile.

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