Abstract
Surf zone is a sand area that stretches inside a breaking wave to limit the rise and fall of waves on the beach. Advanced technology in the geomatics field offers a fast and accurate solution to produce surf zone maps. The demand for surf zone map is increasing during the monsoon season, especially at coastal areas. Nowadays, the Unmanned Aerial Vehicle (UAV) or drone has become popular platform in the geospatial and surveying field. The aim of this study is to produce surf zone 3D surface mapping by using a multirotor Unmanned Aerial Vehicle. There are four phases in this study which are image acquisition, UAV image processing, photogrammetric results, and analysis. The image acquisition was solely obtained using a multirotor UAV based on the photogrammetric concept. The acquired UAV images were processed using commercial software with a specific workflow. Photogrammetric products such as digital elevation model, orthophoto, contour, and surf map zone were produced. The analyses of these results were conducted based on different epochs on the selected months. The accuracy for northing, easting, and height coordinates was 1.026m, 0.838m, and 0.419m, respectively. It can be concluded that the UAV was able to produce a surf zone map with reliable accuracy. This platform is very useful for fast decision making, especially during disaster incidents.
Highlights
Surf zone is an area that stretches between the inside of the surf and the rise and fall of waves on the beach [1]
This Unmanned Aerial Vehicle (UAV) is equipped with Global Positioning System (GPS) which allows it to return at the hovering point when any emergency happens such as signal loss or battery weak
This study investigates the cost, time, and labor need for the surf zone mapping
Summary
Surf zone is an area that stretches between the inside of the surf and the rise and fall of waves on the beach [1]. Mapping the surf zone is important to observe the changes in the region and ensure that it is safe to bathe, swim, and have picnics on the beach. This is because a steep surface signifies that it is not safe for a picnic. The use of geographic information system to provide a complete surf zone map with land data profile, size, shape, and texture is a smart move and saves time and manpower since mapping is done in digital form. Wave height, wave period, wave steepness, and frequency of the wave. Wave frequency is the number of waves that occur in a time unit [7, 8]
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