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Received：11 April 2022，
Revised：2022-08-22，
Published：16 August 2023
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目的
2
精确估计热带气旋的强度有助于提升天气预报和预警的准确性。随着深度学习技术的不断发展，基于卷积神经网络（convolutional neural network，CNN）的方法已应用于强度估计任务中。然而，现有方法仍存在许多问题，例如无法充分利用不同波段的卫星图像信息、输入图像以热带气旋的定位为中心等限制，从而产生较大误差，影响实时估计的结果。针对以上问题，本文提出一种融合定位信息的强度估计网络IEFL（intensity estimation fusing location），提升强度估计的准确率。
方法
2
模型采用双分支结构，能有效融合不同波段的图像特征，同时可以同步优化两个任务，达到互相促进的效果。此外，模型对强度估计任务做了定位的特征融合，将得到的定位特征图与强度特征图进行拼接，共同输出最后的强度结果，通过利用定位信息达到提升强度估计精度的目的。
结果
2
本文在完成热带气旋强度估计的同时，可获取较好的热带气旋中心定位结果。收集了2015—2018年葵花-8卫星多通道图像用以训练模型，并在2019和2020年的数据上进行测试。结果表明，融合定位信息后模型的强度估计均方根误差为4.74 m/s，平均绝对误差为3.52 m/s。相比传统单一强度估计模型误差分别降低了7%和9%。
结论
2
IEFL模型在不依赖定位准确率的同时，能够有效提升强度估计的准确率。
Objective
2
A tropical cyclone can generate such severe weather condition like strong winds or heavy precipitation， as well as such secondary disasters derived of floods， landslides， and mudslides. Tropical cyclones may often threaten survival contexts in related to coastal community. The intensity of tropical cyclones （TC） can be estimated accurately and it is beneficial for weather forecasting and warning. Deep learning techniques-based convolutional neural networks （CNNs） methods have its optimal ability for estimation task of tropical cyclone intensity apparently. However， CNN-based methods are still challenging for such problem of insufficient use of multi-channel satellite images， and the input images are preferred to be centered on the location of tropical cyclones. To resolve large estimation errors and real-time estimation results. we develop a network called intensity-estimation-fusing-location （IEFL） to improve accuracy of intensity estimation further.
Method
2
The training data is captured from Himawari-8 satellite images from 2015 to 2018 in comparason with such data contexts from 2019 to 2020. The dataset contains 42 028 training images and 5 229 testing images. First， the data are preprocessed to remove non-TC cloud systems via clipping satellite images. Then， the implementation of data augmentation strategy is oriented to optimize the over-fitting problem and enhance the model robustness. Moreover， multiple channel images analysis is required to reveal varied features of TCs. Thus， a better combination for intensity estimation can be developed through fusing multi-channel images. The network is set up via a two-branch structure， which can be used to fuse different channel images effectively. Two sort of tasks can be optimized simultaneously and learnt mutually. In addition， the network can feed location task-extracted features into intensity estimation task. Specifically， their feature maps can be concatenated and intensity estimation results are generated as following. The experiment is segmented into two categories as mentioned below： for the first category， it is focused on intensity estimation model only， and different channels-related location information fusion results can be used to analyze the location information-fused impact in relevance to intensity estimation. For the second one， multi-channel integration is selected for the model with location information to analyze the integrated effect of different channel for intensity estimation. The IEFL network is configurable on the Pytorch toolbox. The input images are resized to 512 × 512 pixels for training， the momentum parameter is set to 0.9， the learning rate is set to 0.001， the batch size is set to 5， and the weight decay is 10
-4
. The stochastic gradient descent （SGD） learning procedure is optimized using an NVIDIA GTX TITAN XP device. The loss function of intensity estimation regression is root mean square error （RMSE）. The RMSE can be used to measure the difference between the ground truth and predictable values of tropical cyclone intensity. The smaller the RMSE， the better the performance of the model. Furthermore， the loss function of location regression is recognized as the RMSE as well. Therefore， the total loss function of the model can be set as the sum of the intensity loss and location loss. The main contributions are listed below： 1） develop a location information-fused model to estimate tropical cyclone intensity and location， called intensity-estimation-fusing-location（IEFL）； 2） validate the intensities of tropical cyclones using different channel images captured from the Himawari-8 satellite， and 3） analyze the intensity estimation performance of each channel and the integrated effect of different channel.
Result
2
The non-location information-relevant intensity of root mean square error （RMSE） is 5.08 m/s， in which the location information-relevant intensity of RMSE is 4.74 m/s. Compared to the network without the location task， the RMSE values are reduced by 7%. The error-related comparative analyses are carried out between the IEFL model and other six related methods. Compared to the traditional method deviation angle variance technique （DAVT）， it is increased by about 27%. Compared to the CNN-based methods， it is 11% higher than convolutional neural network-tropical cyclone （CNN-TC）， 8% higher than tropical cyclone intensity estimation net （TCIENet）， as well as 4% higher than tropical cyclone intensity classification and estimation net （TCICENet）.
Conclusion
2
we develop the IEFL model to estimate intensity in terms of location information fusion. This IEFL is focused on improving the accuracy of intensity estimation beyond location accuracy. The experiment result shows that location information-fused model has its optimal potentials farther.
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