Method for Measuring the Surface Velocity Field of a River Using Images Acquired by a Moving Drone
1.1. Motive and Purpose of the Study
1.2. Flow Velocity Measurement with the Existing Drone Method
2. Materials and Methods
2.1. Drone and Camera Used in the Study
2.2. Physical Locations in Drone Images
2.3. Spatiotemporal Images for Each Measurement Section
3.1. Andong River Experiment Center’s Steep Waterway
3.2. Mujudaegyo Bridge Upstream
|Microwave Current Meter||Navigating Drone|
(South → North)
(North → South)
- A method of determining the moving direction of the drone and the direction of the image using GPS information in the drone video is presented. To this end, the image direction is first determined, and then each image point is converted into a physical global coordinate system (UTM coordinate system).
- The start and end frames are designated, then divided into reference frames (measurement subsections) at regular intervals. Images are collected for 1 s (30 frames), and the flow rate is calculated using spatiotemporal volume analysis.
- The analyzed image is displayed on the integrated total image. In addition, the analysis data can be displayed directly on Google Maps.
- The comparison of our method to the existing method of using video analysis on the footage from a stationary flying drone, was very favorable.
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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|Matrice 300 RTK|
|Dimension||810 × 670 × 430 mm|
|Maximum hovering time||55 min|
|Hovering accuracy||Vertical: ±0.5 m|
Horizontal: ±1.5 m
|Sensor||1/2.3” CMOS: 6.16 × 4.55 mm2|
|Maximum image size||1920 × 1080 pixel|
|Lens||FOV 82.9°, 24 mm|
|Gimbal||3 axes (pitch, roll, yaw)|
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Yu, K.; Lee, J. Method for Measuring the Surface Velocity Field of a River Using Images Acquired by a Moving Drone. Water 2023, 15, 53. https://doi.org/10.3390/w15010053
Yu K, Lee J. Method for Measuring the Surface Velocity Field of a River Using Images Acquired by a Moving Drone. Water. 2023; 15(1):53. https://doi.org/10.3390/w15010053Chicago/Turabian Style
Yu, Kwonkyu, and Junhyeong Lee. 2023. "Method for Measuring the Surface Velocity Field of a River Using Images Acquired by a Moving Drone" Water 15, no. 1: 53. https://doi.org/10.3390/w15010053