Improved Calibration of Wind Estimates from Advanced Scatterometer MetOp-B in Korean Seas Using Deep Neural Network
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Title
- Improved Calibration of Wind Estimates from Advanced Scatterometer MetOp-B in Korean Seas Using Deep Neural Network
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Author(s)
- Park, Sung Hwan; Yoo, Jeseon; Son, Dong Hwi; Kim, Jin Ah; Jung, Hyung-Sup
- KIOST Author(s)
- Park, Sung Hwan(박숭환); Yoo, Jeseon(유제선); Son, Dong Hwi(손동휘); Kim, Jinah(김진아)
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Alternative Author(s)
- 박숭환; 유제선; 손동휘; 김진아
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Publication Year
- 2021-10
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Abstract
- Satellite-based observations of sea wind are useful for forecasting marine weather and performing marine disaster management. Meteorological Operational Satellite-B (MetOp-B) is one of the satellites that provide wind products through a scatterometer named the Advanced Scatterometer (ASCAT). Since the linear regression method has been conventionally employed for calibrating remotely-sensed wind data, deviations and biases remain un-resolved to some degree. For coastal applications, these remotely-sensed wind data need to be calibrated again using local in-situ measurements in order to provide more accurate and realistic information. Thus, this study proposed a new method to calibrate ASCAT-based wind speed estimates using artificial neural networks. Herein, a deep neural network (DNN) model was applied. Wind databases collected during a period from 2012 to 2019 by the MetOp-B ASCAT and ten buoy stations in Korean seas were considered for deep learning-based calibration. ASCAT-based wind data and in-situ measurements were collocated in space and time. They were then separated into training and validation sets. A DNN model was designed and trained using multiple input variables such as observation location, sensing date and time, wind speed, and wind direction of the training set. The DNN-based best fit calibration model was evaluated using the validation set. The mean of biases between ASCAT-based and in-situ wind speeds was found to be decreased from 0.41 to 0.05 m/s on average for all buoy locations. The root mean squared error (RMSE) of wind speed was reduced from 1.38 m/s to 0.93 m/s. Moreover, the DNN-based calibration considerably improved the quality of wind speeds of less than 4 m/s, and of high wind speeds of 11–25 m/s. These results suggest that ASCAT-based observations can accurately represent real wind fields if a DNN-based calibration approach is applied.
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ISSN
- 2072-4292
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/41674
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DOI
- 10.3390/rs13204164
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Bibliographic Citation
- Remote Sensing, v.13, no.20, 2021
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Publisher
- Multidisciplinary Digital Publishing Institute (MDPI)
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Keywords
- MetOp-B; ASCAT; deep neural network; Korean seas; wind speed
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Type
- Article
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Language
- English
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Document Type
- Article
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