期刊
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
卷 60, 期 -, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TGRS.2022.3192825
关键词
Photonics; Bathymetry; Earth; Sea surface; Remote sensing; Artificial satellites; Oceans; Bathymetry; Ice; Cloud and Elevation Satellite-2 (ICESat-2); landsat8; machine learning
类别
资金
- NASA ICESat-2 Program [NNH19ZDA001N-ICESAT2]
In recent years, the combination of spaceborne ICESat-2 lidar data and Landsat/Sentinel-2 data has reduced the cost and difficulty of collecting bathymetry data. In this study, an open source approach was developed to generate bathymetry maps for the shallow water region around the island of Andros, Bahamas. The approach efficiently processed ICESat-2 tracks and Landsat-8 scenes, providing per-pixel depth estimates with high accuracy.
Timely and up-to-date bathymetry maps over large geographical areas have been difficult to create, due to the cost and difficulty of collecting in situ calibration and validation data. Recently, combinations of spaceborne Ice, Cloud, and Elevation Satellite-2 (ICESat-2) lidar data and Landsat/sentinel-2 data have reduced these obstacles. However, to date, there have been no means of automatically extracting bathymetry photons from ICESat-2 tracks for model calibration/validation and no well-established open source workflows for generating regional scale bathymetric models. Here we provide an open source approach for generating bathymetry maps for the shallow water region around the island of Andros, Bahamas. We demonstrate an efficient means of processing 224 ICESat-2 tracks and 221 Landsat-8 scenes, using the classification of subaquatic height extracted photons (C-SHELPh) algorithm and Extra Trees Regression to provide 30 m pixel estimates of per-pixel depth and standard error. We map bathymetry with an RMSE of 0.32 m and RMSE% of 6.7%. Our workflow and results demonstrate a means of achieving accurate regional-scale bathymetry maps from purely spaceborne data.
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