Abstract
With the rapid development of UAV (Unmanned Aerial Vehicle) and photography technology, it is now possible to conduct aerial photogrammetry at low tide in the intertidal zone using UAV to generate high-resolution DEM(Digital Elevation Model), which can help interpret intertidal topographic relief and micro-geomorphic features. In this study, the intertidal zone near Heishijiao Park in Dalian City(121.554 E,38.869 N) was selected to investigate the DEM generation method in terms of data preparation, production process, and accuracy control. Low-altitude photogrammetry was carried out using a DJI Phantom 4 Pro UAV to explore the operation method and processing process of intertidal DEM generation, and its planimetric accuracy and elevation accuracy were checked after internal data processing. The applicability and accuracy reliability of the DEM model generated by this method were evaluated in conjunction with relevant measurement specifications. The results showed that, with the reasonable deployment of image control points, the medium error of the DEM plane is 0.190 m and the medium error of elevation is 0.174 m. The accuracy can meet the requirements of 1:500 large-scale mapping. The acquisition of a high-precision DEM enables accurate processing of the intertidal zone, allowing for digital terrain analysis of the area.
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We would like to express our respect and gratitude to all the reviewers and editors for their valuable comments, which have substantially improved the manuscript.
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This work was supported by Liaoning Province Coastline Repair and Survey Project(008006019).
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Yiping Li, Yingchao Wu, Zhihui Sun, Dongyang Zhao, Chuanyang Yu, Yulong Li, Guangran You, Zhongren Kong, Xiaohui Xi and Liyuan Lei participated in the field work. Yiping Li and Yingchao Wu designed the study and wrote the manuscript. All authors contributed substantial feedback during manuscript preparation.
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Li, Y., Wu, Y., Sun, Z. et al. Using UAV imagery to generate DEMs of the intertidal zone. J Coast Conserv 27, 23 (2023). https://doi.org/10.1007/s11852-023-00951-1
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DOI: https://doi.org/10.1007/s11852-023-00951-1