Journal of Infrared and Millimeter Waves, Volume. 44, Issue 2, 189(2025)
Tidal flats extraction in the coastal zone based on time-series Sentinel-2 imagery and near-infrared tidal flats indices
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Fig. 1. Overview map of the study area：（a）study area a；（b）study area b；（c）study area c；（d）study area d
Fig. 3. Schematic of the synthesized high-tide and low-tide images）
Fig. 4. Spectral reflectance profiles of different land types on high-tide and low-tide images
Fig. 6. Statistical results of tidal flat index in four study areas：（a）study area a；（b）study area b；（c）study area c；（d）study area d
Fig. 7. Tidal flat results of three classification methods：（a）minimum distance classification；（b）maximum likelihood classification；（c）support vector machine
Fig. 8. Tidal flat extraction results from different data sources：（a）Zhuhai-1；（b）Landsat；（c）Sentinel-2
Table 1. Accuracy evaluation of the three classification methods in the study area (a)
View tableView in ArticleTable 1. Accuracy evaluation of the three classification methods in the study area (a)
categories Minimum Distance Classification Maximum Likelihood Classification Support Vector Machine tidal flats non-tidal flats tidal flats non-tidal flats tidal flats non-tidal flats tidal flats 197 1 237 54 217 3 non-tidal flats 40 326 0 273 20 324 Minimum Distance Classification Overall precision 92.73% Kappa factor 0.85 Maximum Likelihood Classification Overall precision 90.43% Kappa factor 0.81 Support Vector Machine Overall precision 95.92% Kappa factor 0.92
Table 2. Accuracy evaluation of tidal flat results from different data sources
View tableView in ArticleTable 2. Accuracy evaluation of tidal flat results from different data sources
categories Zhuhai-1 Landsat tidal flats non-tidal flats tidal flats non-tidal flats tidal flats 270 9 210 0 non-tidal flats 12 206 15 180 OHS Overall precision 95.77% Kappa factor 0.91 Landsat Overall precision 96.30% Kappa factor 0.93
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Ru-Jia ZHOU, Qing XIA, Qiong ZHENG, Li-Hong ZHU, Jian-Hua LI, Bin LI, Jia SONG. Tidal flats extraction in the coastal zone based on time-series Sentinel-2 imagery and near-infrared tidal flats indices[J]. Journal of Infrared and Millimeter Waves, 2025, 44(2): 189
Paper Information
Category: Infrared Spectroscopy and Remote Sensing Technology
Received: Aug. 10, 2024
Accepted: --
Published Online: Mar. 14, 2025
The Author Email: Qing XIA (xiaqing@csust.edu.cn)
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