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Beach surface model construction: A strategy approach with structure from motion - multi-view stereo
A T S Ferreira1,2,3, Carlos Henrique Grohmann4, Maria Carolina Hernandez Ribeiro5
1Technology in Environment and Water Resources, São Paulo State Technological College of Jahu, Jaú 17212-599, SP, Brazil.
Methodsx
|April 18, 2024
Summary
This study introduces a cost-effective terrestrial photogrammetry method using Structure from Motion-Multi View Stereo (SfM-MVS) for beach profiling. Strategic placement of ground control points (GCPs) is crucial for accurate coastal mapping with this accessible technique.
Area of Science:
- Geosciences
- Coastal Engineering
- Photogrammetry
Background:
- Traditional beach profiling methods (topographic surveys, GNSS) are often costly and time-consuming.
- Terrestrial photogrammetry offers a potentially more efficient alternative for coastal monitoring.
Purpose of the Study:
- To evaluate the efficiency, cost-effectiveness, and simplicity of the Structure from Motion-Multi View Stereo (SfM-MVS) method for beach profiling.
- To assess the impact of ground control point (GCP) and checkpoint (CKP) distribution on SfM-MVS accuracy in coastal mapping.
Main Methods:
- Utilized terrestrial photogrammetry with a 12-megapixel camera for image acquisition.
- Processed images using Agisoft Metashape Professional software.
- Validated accuracy with GCPs and CKPs calibrated via GNSS.
Main Results:
- The SfM-MVS method demonstrated efficiency, cost-effectiveness, and simplicity compared to traditional techniques.
- Significant variations in positional accuracy were observed based on GCP distribution.
- Optimal distribution of GCPs and CKPs is critical for reliable coastal mapping.
Conclusions:
- SfM-MVS is a powerful and accessible tool for coastal monitoring, enabling the use of common devices like smartphones.
- Strategic distribution of GCPs and CKPs is essential for maximizing the accuracy of SfM-MVS in coastal environments.
- This research advances efficient and accessible beach profile monitoring for coastal management.
