Determining a display position of road name data and displaying the road name data
First Claim
Patent Images
1. A method of determining a display position for road name data in a navigation system, comprising:
- selecting a link representing a road segment from stored map data of the navigation system, the link having a start point and an end point;
calculating an angle in a direction of the end point of the selected link, clockwise from the start point of the selected link and with reference to a true north direction;
comparing the calculated angle to a threshold angle with respect to the reference true north direction the threshold angle being an angle of 180°
clockwise with respect to the true north direction;
determining whether the calculated angle is less than or greater than the threshold angle;
based on results of determining whether the calculated angle is less than or greater than the threshold angle, setting the start point of the reference link as a display reference position if the calculated angle (θ
) of the link is 0°
≦
θ
<
180°
; and
setting the end point of the reference link as the display reference position if the calculated angle (θ
) of the link is not 0°
≦
θ
<
180°
; and
storing, in memory of the navigation system, road name display position information as including the set display reference position.
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Abstract
A method of determining a display position for road name data including selecting a link representing a road segment with an initial road name display position from stored map data. An angle of the selected link is calculated, and calculating an angle of the selected link, a display reference position is identified to display the road name. Updated road name display position information including the determined display reference position is stored relative to the link.
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Citations
8 Claims
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1. A method of determining a display position for road name data in a navigation system, comprising:
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selecting a link representing a road segment from stored map data of the navigation system, the link having a start point and an end point; calculating an angle in a direction of the end point of the selected link, clockwise from the start point of the selected link and with reference to a true north direction; comparing the calculated angle to a threshold angle with respect to the reference true north direction the threshold angle being an angle of 180°
clockwise with respect to the true north direction;determining whether the calculated angle is less than or greater than the threshold angle; based on results of determining whether the calculated angle is less than or greater than the threshold angle, setting the start point of the reference link as a display reference position if the calculated angle (θ
) of the link is 0°
≦
θ
<
180°
; and
setting the end point of the reference link as the display reference position if the calculated angle (θ
) of the link is not 0°
≦
θ
<
180°
; andstoring, in memory of the navigation system, road name display position information as including the set display reference position. - View Dependent Claims (2, 3, 4)
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5. A method for determining a display position for road name data in a navigation system, the method comprising:
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selecting links representing a road segment in a route, the road segment including a start node, one or more shape points, and an end node; acquiring information of a start point and an end point for each of the selected links, the start point being defined by one of the start node of the road segment or a shape point of the road segment and the end point being defined by one of a shape point of the road segment or the end node of the road segment; calculating, based on the acquired information of the start point and the end point for each of the selected links, a length of each of the selected links; comparing the calculated length of each of the selected links; selecting, based on the comparison of the calculated length of each of the selected links, a link of the road segment as a reference link; calculating an angle in a direction of the end point of the reference link, clockwise from the start point of the reference link and with reference to a true north direction; comparing the calculated angle to a threshold angle with respect to the true north direction the threshold angle being an angle of 180°
clockwise with respect to the true north direction;determining whether the calculated angle is less than or greater than the threshold angle; based on results of determining whether the calculated angle is less than or greater than the threshold angle, setting the start point of the reference link as a display reference position if the calculated angle (θ
) of the link is 0°
≦
θ
<
180°
; and
setting the end point of the reference link as the display reference position if the calculated angle (θ
) of the link is not 0°
≦
θ
<
180°
; andstoring, in memory of the navigation system, road name display position information as including the set display reference position. - View Dependent Claims (6, 7, 8)
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Specification