Lightweight Neural Network For Spatiotemporal Filling of Data Gaps in Sea Surface Temperature Images

Baker, Stephanie, Huang, Zhi, and Philippa, Bronson (2023) Lightweight Neural Network For Spatiotemporal Filling of Data Gaps in Sea Surface Temperature Images. IEEE Transactions on Geoscience and Remote Sensing, 61. 4204310.

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Optical remotely sensed data often have data gaps due to cloud coverage, which hinders their full potential in many environmental applications. The question of how to accurately and effectively reconstruct the measurements in the data gaps remains a challenge. In this study, we developed a bidirectional long short-term memory (BiLSTM) model with a novel and adaptable custom temporal penalty layer for spatiotemporal gap-filling. The model was trained and tested in time-series daily night-time sea surface temperature (SST) images acquired by the Himawari-8 satellite. The modelling results showed strong performance, accurately reconstructing spatial and temporal features of cloud affected SST data. Our neural network achieved a per-image MAE of 0.1193°C and per-image RMSE of 0.1293°C. The model was also able to produce realistic SST time-series predictions that were consistent with the expected seasonal variables. Importantly, the BiLSTM model outperformed the previous state-of-the-art Simple Spatial Gapfilling Processor (SSGP) algorithm in terms of error metrics, structural similarity, and computational efficiency. Overall, the results of this study indicates that the BiLSTM neural network model we developed is highly suitable for spatiotemporal gap-filling of SST and other remotely sensed data.

Item ID: 78694
Item Type: Article (Research - C1)
ISSN: 1558-0644
Copyright Information: © 2023 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.
Date Deposited: 17 May 2023 01:03
FoR Codes: 37 EARTH SCIENCES > 3705 Geology > 370504 Marine geoscience @ 30%
46 INFORMATION AND COMPUTING SCIENCES > 4611 Machine learning > 461104 Neural networks @ 70%
SEO Codes: 22 INFORMATION AND COMMUNICATION SERVICES > 2204 Information systems, technologies and services > 220403 Artificial intelligence @ 70%
28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280111 Expanding knowledge in the environmental sciences @ 30%
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