平衡剖面模式下海岸线遥感提取中不同潮位校正方法对比研究*

doi:10.11978/2023009

Abstract

Abstract:

Tide level correction is an important step in coastline extraction. Regarding to the current problems of remote sensing based coastline extraction, such as the predominance of instantaneous water boundary line, the diversity of tidal level correction methods, and low accuracy, this paper introduces a new high-resolution remote sensing coastline tidal level correction method based on the improved Bodge balanced profile tidal level correction, and makes a comparative analysis of common tidal level correction methods. The research selects typical sandy beaches, Haimen Bay and Pinghai Bay in Guangdong Province, and coordinates with normalized difference water index, Otsu algorithm, mathematical morphology and edge detection operator to realize fast and automatic extraction of instantaneous water boundary line, then, different tidal level correction methods are used to obtain real coastline data. Finally, combined with real-time kinematic (RTK) measured point data, the results of tidal level correction based on the balanced profile model, fitting linear tidal level correction, and traditional tidal level correction methods are compared and analyzed. The results show that: (1) The accuracy of the tidal level correction method based on the balanced profile model is superior to the fitting linear tidal level correction method and the traditional tidal level correction method. (2) Among the tidal level correction methods that are both based on the balanced profile model, the tidal level correction method based on the improved Bodge balanced profile model has higher accuracy than the tidal level correction method based on the Bruun-Dean balanced profile model; based on the reference coastline data, the accuracy of the extracted shoreline is verified to be 2 meters using the cross-sectional method. The research results can provide cases and decision-making basis for accurate coastline extraction and coastal planning.

Key words: Bodge balanced profile model, tidal correction, coastline extraction, high resolution image

WU Tongren, LIU Pei, YU Jitao, WEN Tingting. Comparative study on different tide level correction methods in remote sensing extraction of coastline under balanced profile model^*[J].Journal of Tropical Oceanography, 2023, 42(6): 52-62.

Figures/Tables 13

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地区	拟合模型	确定系数	相关系数	误差平方和
海门湾	Bodge剖面模型	0.95	0.98	3.95
海门湾	Bruun-Dean剖面模型	0.90	0.97	8.05
海门湾	线性拟合模型	0.43	0.92	45.16
平海湾	Bodge剖面模型	0.93	0.87	3.02
平海湾	Bruun-Dean剖面模型	0.92	0.80	4.72
平海湾	线性拟合模型	0.90	0.71	9.76

潮位校正方法	最大偏移量/m	最小偏移量/m	平均偏移量/m	标准差/m
Bodge模型潮位校正	6.7	0.1	2.0	1.2
Bruun-Dean模型潮位校正	8.2	0	2.6	1.8
线性模型潮位校正	9.6	2.6	3.9	2.1
传统潮位校正	8.9	1.0	3.1	2.0

Comparative study on different tide level correction methods in remote sensing extraction of coastline under balanced profile model^*

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Comparative study on different tide level correction methods in remote sensing extraction of coastline under balanced profile model*

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Comparative study on different tide level correction methods in remote sensing extraction of coastline under balanced profile model^*