Map display device and map display method
First Claim
Patent Images
1. A map display device mounted in a mobile object comprising:
- displayable range determination means for determining a displayable range of a road map based on a reference point, a viewpoint, and a viewing angle settled on the road map, wherein the viewpoint has a predetermined height defined by a length perpendicular to a plane including the displayable range, the viewing angle is configured to vary on the plane including the displayable range in a direction orthogonal to a virtual reference line between the viewpoint and the reference point while being centered on the virtual reference line between the viewpoint and the reference point;
display control means for displaying a three-dimensional road map on a screen, the three-dimensional road map being generated by applying a coordinate conversion process to a road map belonging to the displayable range; and
viewing angle change means for changing the viewing angle for the three-dimensional road map displayed on the screen based on the reference point with the predetermined height of the viewpoint unchanged whereinthe reference point is settled on or near a certain road, which is at least one of (i) a road for a mobile object to be positioned and (ii) a road included in a route to a user-input destination,the viewing angle change means changes a viewing angle depending on a road attribute of the certain road,the viewing angle change means changes a viewing angle depending on a road type of the certain road, anda viewing angle for an expressway is smaller than a viewing angle for a general road.
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Abstract
In a map display device, a viewing angle for a three-dimensional road map can be changed horizontally on a screen so that the three-dimensional road map is generated at a standard viewing angle (45°) up to a wide viewing angle (90°). At this time, the viewing angle is changed based on a reference line passing through a current position of a subject vehicle where the map display device is mounted.
24 Citations
10 Claims
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1. A map display device mounted in a mobile object comprising:
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displayable range determination means for determining a displayable range of a road map based on a reference point, a viewpoint, and a viewing angle settled on the road map, wherein the viewpoint has a predetermined height defined by a length perpendicular to a plane including the displayable range, the viewing angle is configured to vary on the plane including the displayable range in a direction orthogonal to a virtual reference line between the viewpoint and the reference point while being centered on the virtual reference line between the viewpoint and the reference point; display control means for displaying a three-dimensional road map on a screen, the three-dimensional road map being generated by applying a coordinate conversion process to a road map belonging to the displayable range; and viewing angle change means for changing the viewing angle for the three-dimensional road map displayed on the screen based on the reference point with the predetermined height of the viewpoint unchanged wherein the reference point is settled on or near a certain road, which is at least one of (i) a road for a mobile object to be positioned and (ii) a road included in a route to a user-input destination, the viewing angle change means changes a viewing angle depending on a road attribute of the certain road, the viewing angle change means changes a viewing angle depending on a road type of the certain road, and a viewing angle for an expressway is smaller than a viewing angle for a general road. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A map display device mounted in a mobile object comprising:
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displayable range determination means for determining a displayable range of a road map based on a reference point, a viewpoint, and a viewing angle settled on the road map, wherein the viewpoint has a predetermined height defined by a length perpendicular to a plane including the displayable range, the viewing angle is configured to vary on the plane including the displayable range in a direction orthogonal to a virtual reference line between the viewpoint and the reference point while being centered on the virtual reference line between the viewpoint and the reference point; display control means for displaying a three-dimensional road map on a screen, the three-dimensional road map being generated by applying a coordinate conversion process to a road map belonging to the displayable range; and viewing angle change means for changing the viewing angle for the three-dimensional road map displayed on the screen based on the reference point with the predetermined height of the viewpoint unchanged, wherein the reference point is settled on or near a certain road, which is at least one of (i) a road for a mobile object to be positioned and (ii) a road included in a route to a user-input destination, the viewing angle change means changes a viewing angle depending on a road attribute of the certain road, the viewing angle change means changes a viewing angle depending on a road width of the certain road, and a viewing angle is increased as the road width increases.
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10. A map display device mounted in a mobile object comprising:
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displayable range determination means for determining a displayable range of a road map based on a reference point, a viewpoint, and a viewing angle settled on the road map, wherein the viewpoint has a predetermined height defined by a length perpendicular to a plane including the displayable range, the viewing angle is configured to vary on the plane including the displayable range in a direction orthogonal to a virtual reference line between the viewpoint and the reference point while being centered on the virtual reference line between the viewpoint and the reference point; display control means for displaying a three-dimensional road map on a screen, the three-dimensional road map being generated by applying a coordinate conversion process to a road map belonging to the displayable range; and viewing angle change means for changing the viewing angle for the three-dimensional road map displayed on the screen based on the reference point with the predetermined height of the viewpoint unchanged, wherein the reference point is settled on or near a certain road, which is at least one of (i) a road for a mobile object to be positioned and (ii) a road included in a route to a user-input destination, the viewing angle change means changes a viewing angle depending on a road attribute of the certain road, the viewing angle change means changes a viewing angle depending on a number of lanes included in the certain road, and a viewing angle is increased as the number of lanes increases.
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Specification