Photogrammetry Survey Position Correction Without Ground Markers
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Solution Overview
Problem
Current photogrammetry systems using unmanned aerial vehicles (UAVs) cannot determine absolute coordinates, positions, and rotation accurately due to limitations in image overlap and the need for external markers, which complicates the generation of precise stereo models.
Innovation Solution
A survey system that includes a movable photographing device, a surveying device with known coordinates, and a photogrammetry analysis unit that associates image positions with survey results by recognizing features such as distance measurement lights or marker members, allowing for improved accuracy without the need for external air marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If control points are framed in all images to associate image with ground point, then absolute coordinates can be determined, but photographing operation is limited and requires at least four control points
Solution Approach 1:
The surveying device itself serves as the control point by being tracked and having its position determined. The system uses the surveying device's own position data (obtained through tracking) as the reference for determining absolute coordinates of photographing positions, eliminating the need for separate control points in the photographed images
Solution Approach 2:
The surveying device performs multiple functions: it tracks the movable photographing device to determine photographing positions, and simultaneously serves as the reference object for absolute coordinate determination. This multi-functionality replaces the need for dedicated control points
2Measurement precision
If air marks are installed to clearly frame control points, then control points can be identified, but additional markers and setup effort are required
Solution Approach 1:
The surveying device serves its own purpose as the control point without requiring additional markers. Its position is determined through tracking, and this position data is used directly for coordinate determination, making the system self-sufficient
Solution Approach 2:
The invention extracts and eliminates the need for separate air marks or control point markers by using the surveying device itself as the reference. The system removes the unnecessary component (external markers) while maintaining the essential function
3Measurement precision
If total station is used to determine UAV position, then position accuracy is improved, but total station must be away from camera during photographing operation
Solution Approach 1:
The system uses an intermediary approach where the surveying device tracks the movable photographing device to determine its position. This tracking mechanism allows the surveying device to be positioned conveniently while still achieving accurate position determination through continuous tracking
Data Source
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AI summary
A photogrammetry analysis unit 52 of an analysis device 4 associates the survey result obtained by a surveying device 3 with a photographing position of each image taken by a camera 11, recognizes the surveying device 3 from the image containing the surveying device 3, corrects the photographing position based on the known point coordinates of the surveying device 3, and generates the data for photogrammetry.