SAR Building Tilt Detection via Displacement Segmentation
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Solution Overview
Problem
Existing SAR technologies cannot determine whether a building is tilted due to unequal settling, as they only provide measurement data on displacement amounts without indicating tilt.
Innovation Solution
An information provision device that acquires SAR measurement data, detects tilt due to unequal settling of a building based on displacement amounts, and displays the detected tilt on map data, using a detection unit and display unit to visualize the tilt on SAR image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If only displacement amount measurement data is provided, then the simplicity of data provision is maintained, but the ability to determine building tilt is lost
Solution Approach 1:
The patent segments the building tilt detection problem into multiple displacement measurement points (e.g., four corners of the building). By measuring displacement at multiple locations and comparing the differences, the system can determine both the overall settlement and the tilt of the building. This segmentation allows comprehensive information extraction while maintaining the use of simple SAR displacement measurement technology.
Solution Approach 2:
The patent transitions from providing only scalar displacement amount data to providing spatially-resolved displacement data across multiple building locations. By adding the spatial dimension (multiple measurement points arranged in a plan view), the system enables tilt detection without changing the fundamental SAR measurement technique. The map display further adds a visual spatial dimension to present the tilt information intuitively.
2Measurement precision
If multiple observation periods are used to improve measurement accuracy, then displacement measurement precision is improved, but the time required for analysis increases
Solution Approach 1:
The patent applies partial action by selecting only the essential observation periods needed for tilt detection. Instead of requiring analysis of all available SAR observations, the system identifies and uses a minimal sufficient set of observation pairs that provide adequate precision for detecting building tilt. This reduces the computational burden and analysis time while maintaining measurement accuracy.
Solution Approach 2:
The patent performs preliminary processing of SAR observation data to pre-identify potential tilt cases before detailed analysis. By pre-calculating displacement patterns at multiple building locations and comparing them against tilt criteria, the system can quickly screen for buildings that require detailed tilt analysis, thereby reducing the overall time required for comprehensive building stock assessment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables users to identify tilted buildings by displaying their positions on map data, providing essential information for infrastructure planning and maintenance.
Implementation Method 1
Synthetic aperture radar (SAR) is mounted on an aircraft or an artificial satellite, and emits microwaves toward the earth's surface and receives reflected waves from the earth's surface, thereby observing a distance from the earth's surface to the SAR-equipped machine
Implementation Method 2
According to a technique called interferometric SAR (InSAR), it is possible to measure a displacement (such as uplift or settling) of the earth's surface in the vertical direction with an accuracy at a several-centimeter level from data observed twice by the SAR
Data Source
AI summary
This information provision device provides a user of observation data obtained by synthetic aperture radar (SAR) with information regarding the tilt of a building. A detection unit (12) acquires measurement data of the amount of displacement of a building measured on the basis of observation data obtained by SAR, and detects the tilt of the building due to unequal settlement on the basis of the amount of displacement of the building. A display unit (13) displays, on map data, the location of the building for which the tilt has been detected.