Aerial Photogrammetry Using GNSS-Equipped Vehicles as Ground Control Points
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Solution Overview
Problem
Aerial photogrammetry techniques require extensive time and labor to place measurement targets, which increases costs and interferes with ongoing civil engineering works, and the accuracy of survey data is compromised due to the complexity of target placement and the need for multiple targets.
Innovation Solution
A survey data processing device equipped with a GNSS location identifying unit and identification markers on vehicles, which allows for the identification of ground control points in aerial photographs using location data and image analysis, eliminating the need for conventional survey targets and reducing the complexity of target placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional measurement targets are used in aerial photogrammetry, then survey accuracy can be maintained, but time and labor increase significantly due to the need to measure and place multiple targets beforehand
Solution Approach 1:
The vehicle itself serves as the measurement target by being equipped with GNSS location identifying units and identification markers. The vehicle performs self-positioning through GNSS while simultaneously serving as the survey target, eliminating the need for external measurement targets to be placed beforehand.
Solution Approach 2:
The patent uses identification markers on the vehicle as visual copies or representations of the vehicle's position. These markers are detected in aerial photographs to establish ground control points, serving as a visual copy of the vehicle's GNSS-determined location for photogrammetry purposes.
2Measurement precision
If the number of measurement targets is increased to improve survey accuracy, then measurement precision improves, but time and labor costs increase
Solution Approach 1:
The vehicle performs multiple functions simultaneously: it is both the object being surveyed and the source of ground control points. By equipping the vehicle with GNSS units and identification markers, it serves dual purposes as both the survey target and the positioning reference, eliminating the need for separate measurement targets.
3Measurement precision
If measurement targets are placed beforehand to ensure survey accuracy, then measurement precision improves, but the operation becomes complicated and interferes with ongoing civil engineering works
Solution Approach 1:
The GNSS location identifying unit continuously acquires position information of the vehicle before and during the aerial photography operation. This preliminary and continuous positioning action eliminates the need for beforehand placement of measurement targets, as the vehicle's position is already known through GNSS tracking.
4Loss of information
If conventional target placement methods are used, then survey data can be obtained, but the process requires extensive preparation time and labor before actual surveying
Solution Approach 1:
The patent replaces the mechanical process of physically placing and measuring measurement targets with a GNSS-based electronic positioning system. The GNSS location identifying unit electronically determines the vehicle's position without requiring mechanical target placement, significantly reducing preparation time while maintaining survey data availability.
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 highly accurate aerial photogrammetry while minimizing costs by using vehicles with GNSS units and identification markers to automatically identify ground control points, thereby streamlining the survey process and reducing interference with ongoing works.
Implementation Method 1
The GNSS location identifying unit identifies location using a GNSS
Implementation Method 2
The identification marker detecting part detects the identification marker of the vehicle in the aerial photograph of the image data
Data Source
AI summary
Highly accurate aerial photogrammetry is performed while avoiding increase in cost. A survey data processing device includes an image data receiving part, a location data receiving part, an identification marker detecting part, an identifying part, and a location identifying part. The image data receiving part receives image data of aerial photographs of vehicles. The vehicles are equipped with GNSS location identifying units and identification markers, respectively. The location data receiving part receives location data of the vehicles that are identified by the respective GNSS location identifying units. The identification marker detecting part detects the identification markers of the vehicles from the image data. The identifying part identifies each of the vehicles in the aerial photographs. The location identifying part identifies locations of ground control points (GCPs) in the aerial photographs by using the location data of the vehicles and by using the identification information.