Bathymetry derivation and slope-assisted benthic mapping using optical satellite imagery in combination with ICESat-2
Mapping benthic reefs at high resolution and accuracy is vital for the management and conservation of coral habitats. Optical remote sensing data has emerged as a valuable tool for large-scale reef mapping in the past decades, with numerous data sets and methods being utilised and developed. In this...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-03-01
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| Series: | International Journal of Applied Earth Observations and Geoinformation |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1569843224000542 |
| _version_ | 1797303380557692928 |
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| author | Yuhui Liu Yu Zhou Xiaoqiang Yang |
| author_facet | Yuhui Liu Yu Zhou Xiaoqiang Yang |
| author_sort | Yuhui Liu |
| collection | DOAJ |
| description | Mapping benthic reefs at high resolution and accuracy is vital for the management and conservation of coral habitats. Optical remote sensing data has emerged as a valuable tool for large-scale reef mapping in the past decades, with numerous data sets and methods being utilised and developed. In this study, we present a comprehensive comparison of optical remote sensing based bathymetry and benthic mapping methods. We use different optical data including WorldView-2 stereo and Sentinel-2 imagery to map the water depths of coral reef areas in the Xisha region of the South China Sea. Bathymetry data derived from photogrammetric and linear regression methods are compared to the reprocessed Ice, Cloud and land Elevation Satellite-2 (ICESat-2) data. We find that the linear regression method (root-mean-square-error, RMSE = 0.60 m) outperforms photogrammetry (RMSE = 1.02 m), and the higher resolution WorldView-2 data yields less systematic biases than Sentinel-2 data. Considering that water depths reflect changes in temperature and light, which are critical factors influencing coral reef distribution, we propose to use satellite-derived bathymetry as a feature for coral reef classification. We demonstrate that combining topography and spectral information can improve the overall mapping accuracy, particularly for compositions characterised by sharp boundaries. |
| first_indexed | 2024-03-07T23:51:54Z |
| format | Article |
| id | doaj.art-4bd29f4c0b084d15a75ef8778d8eb8b4 |
| institution | Directory Open Access Journal |
| issn | 1569-8432 |
| language | English |
| last_indexed | 2024-03-07T23:51:54Z |
| publishDate | 2024-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Applied Earth Observations and Geoinformation |
| spelling | doaj.art-4bd29f4c0b084d15a75ef8778d8eb8b42024-02-19T04:13:19ZengElsevierInternational Journal of Applied Earth Observations and Geoinformation1569-84322024-03-01127103700Bathymetry derivation and slope-assisted benthic mapping using optical satellite imagery in combination with ICESat-2Yuhui Liu0Yu Zhou1Xiaoqiang Yang2Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou 510275, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, ChinaCorresponding author at: Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.; Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou 510275, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, ChinaGuangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou 510275, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, ChinaMapping benthic reefs at high resolution and accuracy is vital for the management and conservation of coral habitats. Optical remote sensing data has emerged as a valuable tool for large-scale reef mapping in the past decades, with numerous data sets and methods being utilised and developed. In this study, we present a comprehensive comparison of optical remote sensing based bathymetry and benthic mapping methods. We use different optical data including WorldView-2 stereo and Sentinel-2 imagery to map the water depths of coral reef areas in the Xisha region of the South China Sea. Bathymetry data derived from photogrammetric and linear regression methods are compared to the reprocessed Ice, Cloud and land Elevation Satellite-2 (ICESat-2) data. We find that the linear regression method (root-mean-square-error, RMSE = 0.60 m) outperforms photogrammetry (RMSE = 1.02 m), and the higher resolution WorldView-2 data yields less systematic biases than Sentinel-2 data. Considering that water depths reflect changes in temperature and light, which are critical factors influencing coral reef distribution, we propose to use satellite-derived bathymetry as a feature for coral reef classification. We demonstrate that combining topography and spectral information can improve the overall mapping accuracy, particularly for compositions characterised by sharp boundaries.http://www.sciencedirect.com/science/article/pii/S1569843224000542Satellite-derived bathymetryBenthic mappingOptical satellite imageryComparative study |
| spellingShingle | Yuhui Liu Yu Zhou Xiaoqiang Yang Bathymetry derivation and slope-assisted benthic mapping using optical satellite imagery in combination with ICESat-2 International Journal of Applied Earth Observations and Geoinformation Satellite-derived bathymetry Benthic mapping Optical satellite imagery Comparative study |
| title | Bathymetry derivation and slope-assisted benthic mapping using optical satellite imagery in combination with ICESat-2 |
| title_full | Bathymetry derivation and slope-assisted benthic mapping using optical satellite imagery in combination with ICESat-2 |
| title_fullStr | Bathymetry derivation and slope-assisted benthic mapping using optical satellite imagery in combination with ICESat-2 |
| title_full_unstemmed | Bathymetry derivation and slope-assisted benthic mapping using optical satellite imagery in combination with ICESat-2 |
| title_short | Bathymetry derivation and slope-assisted benthic mapping using optical satellite imagery in combination with ICESat-2 |
| title_sort | bathymetry derivation and slope assisted benthic mapping using optical satellite imagery in combination with icesat 2 |
| topic | Satellite-derived bathymetry Benthic mapping Optical satellite imagery Comparative study |
| url | http://www.sciencedirect.com/science/article/pii/S1569843224000542 |
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