Map Data Update Apparatus Using MMS Shift Correction
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Solution Overview
Problem
Updating map data after changes such as road repairs or white line repainting is time-consuming and inefficient, as it requires actual survey measurements and cannot directly incorporate measurement data from mobile mapping systems (MMS).
Innovation Solution
A map data update apparatus that calculates the shift in location of common ground objects between reference and measurement data, corrects location information, extracts differences in ground objects, and updates the map data accordingly, allowing for direct integration of MMS data without manual surveying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If actual measurement using survey technique is performed to update map data, then measurement precision is improved, but loss of time and productivity deteriorate
Solution Approach 1:
The patent creates a virtual copy of the survey measurement process by using MMS measurement data combined with calculated shift amounts. Instead of performing actual survey measurements, the system copies the essential information needed for map updates by calculating position shifts from MMS data, thereby achieving survey-level update capability without the time cost of actual surveying operations
Solution Approach 2:
The patent replaces the mechanical survey measurement system with an information processing system. Instead of using physical survey equipment and manual measurement processes, the system substitutes these with automated calculation of shift amounts from MMS data, extracting position changes through computational methods rather than mechanical measurement
2Productivity
If MMS measurement data is used directly to update map data, then productivity is improved, but measurement precision deteriorates
Solution Approach 1:
The patent introduces shift amount calculation as an intermediary process between MMS measurement data and map data update. The calculated shift amounts act as a mediator that translates raw MMS position information into corrected map data coordinates, enabling MMS data to be used for updates while maintaining precision through the intermediate correction step
Solution Approach 2:
The patent changes the parameter representation of measurement data by calculating shift amounts (differential parameters) rather than using absolute position data directly. This parameter transformation converts MMS measurement coordinates into position corrections that can be applied to map data, preserving precision while enabling efficient processing
3Measurement precision
If survey technique is used to measure location changes, then measurement precision is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The patent makes the MMS measurement system multi-functional by enabling it to serve both original mapping functions and update detection functions. The same MMS equipment and data processing pipeline used for initial map creation are also used for detecting changes and calculating shift amounts, eliminating the need for separate survey equipment and procedures
4Measurement precision
If survey technique is used to measure location changes, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent enables the MMS system to self-correct its measurement data by automatically calculating shift amounts from the measurement data itself. The system performs its own validation and correction without requiring external survey intervention, making the update process self-sufficient and operationally simpler while maintaining precision through automated correction algorithms
Data Source
AI summary
A part of measurement data (182) is compared with a part of map data (181) based on a feature. The part of the map data is updated based on a comparison result. The map data is updated by reflecting the updated part of the map data in the map data.