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A Spatial-Aware Neural Network for Inversion of Shallow Water Depth from WorldView-02 High-Spectral-Resolution Imagery

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Abstract

Remote sensing shallow water depth inversion is to automatically predict the water depth value of 0–30 m based on the extraction of the significative spectral features. For governments, accurate shallow water depth inversion in real time is crucial to provide important scientific data for shipping safety, marine engineering and military marine. Recent research in machine learning have shown the dominance on shallow water depth inversion. However, previous methods based on machine learning basically stacked the single remote sensing depth pixel and failed to invert the continuous spatial relationship properly. In addition, the precision is limited by the simple structure and insufficient parameter training of classic artificial neural network (ANN). To remedy these issues, we proposed a spatial-aware neural network (SAN-Net) for shallow water depth inversion. The SAN-Net mainly consists of a spatial-aware feature extraction block (SAB) and a fully connected with dropout feature mapping sub-network (FCDN). The SAB consisting of two convolutional pooling operations can capture the spatial features of the neighborhood and improve the feature expression of shallow water depth inversion. The FCDN is constructed to integrate highly abstract features output from the SAB. Finally, the MSE loss with a regularization term is utilized to constrain the training process. Experiment results on the proposed Shallow Water depth Inversion from WorldView-02 in Mischief Reef (SWIW02-MR) dataset demonstrated that the proposed method outperformed several representative machine learning methods.

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Funding

The research was financially supported by the National Natural Science Foundation of China (Grant Nos. 42130309 and 41972066).

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Correspondence to Zheng Guizhou.

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Guizhou, Z., Zhixing, C., Mengxiao, W. et al. A Spatial-Aware Neural Network for Inversion of Shallow Water Depth from WorldView-02 High-Spectral-Resolution Imagery. J Indian Soc Remote Sens 51, 1923–1936 (2023). https://doi.org/10.1007/s12524-023-01732-x

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  • DOI: https://doi.org/10.1007/s12524-023-01732-x

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