Map Scale Determination for Walking Guidance
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Solution Overview
Problem
Existing portable telephone sets struggle to display relevant map data for walking users, such as crossroads and walking road bridges, due to the entire screen being occupied by unnecessary data and the lack of data for walking people, making it difficult to guide walking individuals effectively.
Innovation Solution
A data terminal device that receives position data from artificial satellites, determines the necessary map scale based on moving speed and range, and displays detailed map data only for the predicted moving range, allowing for superimposition of road maps and detailed maps on a display unit, including data for walking users like crossroads and bridges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the entire screen is used to display map data, then the display area is maximized, but unnecessary data is displayed making it difficult to recognize necessary data
Solution Approach 1:
The patent applies local quality by displaying map data at different scales in different regions of the screen. The center region shows a detailed map at a larger scale for the current location, while peripheral regions show broader areas at smaller scales, allowing users to see both detailed local information and contextual global information simultaneously.
2Measurement precision
If detailed map data for walking users is stored, then guidance accuracy for walking users is improved, but memory capacity requirements increase
Solution Approach 1:
The patent segments map data into multiple scale levels and stores only the detailed map data necessary for the user's current movement range. The system divides the map into different granularity levels, storing high-detail data only for areas within the predicted movement range, while using lower-detail data for broader areas, thus reducing overall memory requirements while maintaining guidance accuracy where needed.
Solution Approach 2:
The system dynamically adjusts the amount of detailed map data stored and displayed based on the user's movement speed and predicted movement range. When the user is moving slowly (walking), more detailed data is stored and displayed. When moving faster, less detailed data is maintained, automatically adapting the memory usage to the actual navigation needs.
3Reliability
If map data is updated frequently to maintain up-to-date information, then information currency is improved, but energy consumption and processing load increase
Solution Approach 1:
The system implements periodic updates of map data based on the user's movement range and the predicted movement area. Instead of continuous real-time updates, the system refreshes map data at intervals determined by the user's movement characteristics, updating only when the user has moved to a new area that requires fresh map information, thus reducing unnecessary energy consumption while maintaining information currency.
Data Source
AI summary
A position data receiving part receives position data transmitted from an artificial satellite. A wireless unit transmits and receives data with respect to a base station. A detailed map data memory part stores detailed map data received by the wireless part. Scale determining part determines the scale of the road map according to a plurality of position data received a plurality of times by the position data receiving part. A display part displays the road map of the scale determined by the scale determining part and detailed map data stored in the memory part.