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Map display device and map display method

  • US 8,040,343 B2
  • Filed: 03/02/2005
  • Issued: 10/18/2011
  • Est. Priority Date: 03/02/2005
  • Status: Active Grant
First Claim
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1. A map display device for displaying map data that are composed of vector data in a display means, said map display device comprising:

  • means for creating a plane figure for a bird'"'"'s-eye view, shift amount storage means, building position determination means, and figure data duplication means;

    the means for creating a plane figure for a bird'"'"'s-eye view creates bird'"'"'s-eye-view plane figures of buildings in sequence from the building positioned farthest away in a bird'"'"'s-eye view on the basis of a building position determined by the building position determination means, and draws a first layer of plane data; and

    said figure data duplication means duplicates and draws said first layer of plane data while shifting the first layer of plane data upward on a screen according to said shift amount on the basis of the shift amount stored by said shift amount storage means, and displays said bird'"'"'s-eye view,characterized in that said map data composed of vector data include building data to which height information relating to a height of a building is added,a bird'"'"'s-eye-view plane figure is duplicated and drawn a number of times that is in accordance with said height information while being shifted upward on said screen by said shift amount,said buildings are divided into a plurality of groups having different heights on the basis of the height information,a number of times in accordance with said height information is determined for each group,bird'"'"'s-eye-view plane figures of buildings that have portions at a common height among buildings in a bird'"'"'s-eye view are grouped, andsaid grouped bird'"'"'s-eye view plane figures are duplicated and drawn while said grouped bird'"'"'s-eye-view plane figures are shifted in sequence from said first layer said determined number of times upward on said screen according to a shift amount.

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