Patent ID: 8456474
Filing Date: 2013-06-04
Classification: G01C,G06K

Abstract:
1. A method for rendering an outline of a polygon on a map, comprising the steps of: sequentially selecting element points included in the outline of the polygon represented by polygon data obtained from a map database; when it is determined that a selected one of the polygon element points is positioned on a map mesh boundary, coordinate-shifting the polygon element point toward an inside portion of the polygon by a predetermined amount so that the polygon element point is not positioned on the map mesh boundary, wherein the map mesh boundary corresponds to a longitude or a latitude, and wherein the step of coordinate-shifting the polygon element point is performed by a processor so that the polygon data recorded in the map database is displayed on the map; obtaining the polygon data which has been coordinate-shifted when the polygon is to be displayed in an emphatic manner; and displaying a portion of the outline of the polygon in a non-emphatic manner when the portion of the outline of the polygon represented by the obtained polygon data is positioned on a map mesh boundary, and displaying remaining portions of the outline of the polygon in an emphatic manner, wherein when a portion of the outline of the polygon is to be displayed in a non-emphatic manner, no outline for the portion of the outline is displayed.