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Map display apparatus

  • US 7,460,120 B2
  • Filed: 11/10/2004
  • Issued: 12/02/2008
  • Est. Priority Date: 11/13/2003
  • Status: Expired due to Fees
First Claim
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1. A map display apparatus for displaying a three-dimensional map on a screen, based on map data including data regarding a three-dimensional object,wherein the map data includes a display correction flag indicating whether or not to execute a correction so that a line of the three-dimensional object in a vertical direction is vertical, when the three-dimensional object is displayed on the screen, andwherein the map display apparatus comprises:

  • a correction unit operable to execute, in the case where the display correction flag indicates that the correction should be executed, a correction on a first lean, on the screen, occurring in a line in the vertical direction of the three-dimensional object so that the line in the vertical direction of the three-dimensional object is displayed vertically on the screen while keeping a tilted second lean to be displayed on the screen, the second lean occurring in a line in a horizontal direction of the three-dimensional object, and the first lean and the second lean being a perspective distortion occurring due to a perspective difference between objects from a viewpoint position; and

    a selection unit operable to select one of (i) “

    always execute a correction”

    in said correction unit, (ii) “

    execute a correction based on the display correction flag”

    in said correction unit, and (iii) “

    never execute a correction”

    in said correction unit,wherein in the case where (i) “

    always execute a correction”

    is selected by said selection unit, said correction unit executes the correction on the three-dimensional object regardless of the display correction flag,wherein in the case where (ii) “

    execute a correction based on the display correction flag”

    is selected by said selection unit, said correction unit executes the correction on the three-dimensional object based on the display correction flag, andwherein in the case where (iii) “

    never execute a correction”

    is selected by said selection unit, said correction unit does not execute the correction on the three-dimensional object.

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