Navigation Device Detour Synthesis on Wide Area Maps
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Solution Overview
Problem
Navigation devices struggle to display detours around traffic hazards, such as traffic jams, on a wide area map without requiring users to change the scale, as narrow roads are not visible on the current map level and switching to a detailed scale complicates operations and obscures the overview of the detour.
Innovation Solution
The navigation device uses map data at a level lower than the predetermined level to explore detours and synthesizes the detour image to match the current scale, allowing it to be displayed on the wide area map while maintaining the overview of the guidance route, thus avoiding the need for scale changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If map data at a higher level (wide area map) is displayed, then the overview of the guidance route is maintained, but narrow roads cannot be displayed as detours
Solution Approach 1:
The patent applies dimensionality change by switching from displaying detours on the current wide area map level to displaying them on a lower level (detailed map) and then superimposing that detailed map onto the wide area map. This allows detour information that requires higher detail to be displayed in a different dimensional layer while maintaining the overview context of the wide area map.
2Loss of information
If the scale is increased to display narrow roads as detours, then detour visibility is improved, but the overview of the guidance route is lost and driver anxiety increases
Solution Approach 1:
The patent implements the nested doll principle by superimposing a detailed map (lower level) onto the wide area map (higher level). The detailed map containing detour information is nested within the broader context of the wide area map, allowing both the overview and the detailed detour information to be visible simultaneously without requiring the driver to switch between different map scales.
3Loss of information
If map data at a lower level is used to explore detours, then narrow roads become visible, but the detour cannot be displayed on the current wide area map scale
Solution Approach 1:
The patent resolves the display incompatibility between different map levels by changing the dimensional approach: instead of trying to fit detailed narrow road data into the wide area map's scale, it displays the detailed map at its native scale and then superimposes it onto the wide area map, allowing both levels to coexist without scale conflicts.
4Loss of information
If the user changes the scale to display detours, then detour visibility is improved, but the operation becomes complicated
Solution Approach 1:
The system automatically performs the scale adjustment and map level switching needed to display detours, eliminating the need for manual user intervention. When a detour is detected, the system autonomously switches to the appropriate lower map level, explores the detour, and superimposes the detailed map, providing the detour information without requiring the user to understand or perform any scale-related operations.
Data Source
AI summary
The navigation device includes a detour exploring portion configured to explore a detour to avoid a section in which a traffic hazard occurs using map data at a level lower than a predetermined level when a traffic hazard determining portion determines that the traffic hazard occurs on the guidance route, and a display control portion configured to zoom the detour to match a scale of the detour to a currently designated scale, and synthesize and display the detour on a map image. The navigation device maintains the display of the wide area map and synthesizes and additionally displays a detour, for example, to pass through a road such as a narrow street included in a detailed map on the map image such that the user can receive, at a glance, a detour to easily bypass the section in which a traffic hazard occurs.