Map Display Viewpoint Adjustment for Tunnel Visibility
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Solution Overview
Problem
Existing map display systems fail to prevent the own-vehicle polygon from being hidden by landform polygons when passing through tunnels or mountains, leading to unnecessary image display and map appearance deterioration.
Innovation Solution
A map display system that adjusts the viewpoint's altitude information in the map database to set the viewing position higher than landforms, preventing the viewpoint from entering landform polygons and avoiding unnecessary image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the viewpoint is set at a high position to avoid being hidden by landforms, then the own-vehicle polygon remains visible, but the viewpoint enters landform polygons when passing through tunnels, causing unnecessary image display and map appearance deterioration
Solution Approach 1:
The viewpoint altitude is made dynamic rather than fixed. The system automatically adjusts the viewpoint altitude based on the terrain data at the current vehicle position. When the vehicle is on or near a landform, the viewpoint altitude is increased to prevent hiding; when the vehicle is in a tunnel or depression, the viewpoint altitude is lowered to prevent entering landform polygons. This dynamic adjustment resolves the contradiction by adapting the viewpoint position to the local terrain context.
Solution Approach 2:
The system changes the altitude parameter of the viewpoint based on terrain conditions. By referencing terrain altitude data from the map database at the current position, the system adjusts the viewpoint's vertical position to maintain optimal visibility while avoiding unwanted intersections with landform polygons. This parameter change allows the system to transition between different viewing conditions seamlessly.
2Reliability
If the viewpoint altitude is increased to prevent hiding by landforms, then map visibility improves, but the system complexity increases due to additional terrain data processing
Solution Approach 1:
The system uses the existing map database and terrain data that are already being processed for other navigation functions. The viewpoint control mechanism leverages this pre-existing geographical information without requiring separate sensing or measurement systems. The terrain altitude data is obtained from the same map database used for route planning and position display, making the system self-sufficient and avoiding additional complexity.
Solution Approach 2:
The terrain altitude data serves multiple purposes: it is used for route planning, position display, and now also for dynamic viewpoint altitude adjustment. By making the terrain data multi-functional, the system avoids the need for separate data collection systems and processes, thereby reducing overall system complexity while achieving improved map visibility.
Data Source
AI summary
Based on map information acquired from a map DB, a viewpoint for viewing a ground surface on a map of a set region at a time of displaying the map is set. Altitude information that indicates an altitude of a landform present in at least a partial region of the set region is stored. In a case where the altitude information is present in the map DB at a position on the map, which is set in response to a position indicated by inputted position information, a sight direction of the viewpoint is changed, and the viewpoint is thereby set at a position higher than the altitude of the landform, which is indicated by altitude information of the position on the map. A display data for displaying, on a display device, a map in a case of viewing the ground surface from the viewpoint set is generated.