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Generating a map display image

  • US 9,852,709 B2
  • Filed: 05/29/2008
  • Issued: 12/26/2017
  • Est. Priority Date: 05/29/2008
  • Status: Active Grant
First Claim
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1. A method of generating a display image, the method comprising:

  • selecting from a first sub-set of linepieces, a second sub-set of linepieces according to display criteria including display angle of the linepieces in the first sub-set, a linepiece being a legible text or characters;

    the step of selecting comprising;

    projecting linepieces of the first sub-set into a display space;

    determining the display angle of each linepiece projected in the display space, the display angle of each linepiece being an angle of inclination of the linepiece with respect to a horizontal direction in the display space;

    selecting for the second sub-set each linepiece whose display angle lies in a selection range, wherein each linepiece in the first subset is associated with a priority based on a type of the linepiece, and wherein the selection of second sub-set of linepieces is made from among only linepieces that are of or less than a specified priority; and

    including in the display image the second sub-set of linepieces whose display angle lies in the selection range or whose priority is greater than the specified priority, and excluding from the display image linepieces whose display angle is out of the selection range and whose priority is of or less than the specified priority;

    wherein the display image includes a map view and linepiece information superposed on the map view.

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