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arXiv 2202.01762cs.LGphysics.data-anphysics.geo-ph
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使用深度自动编码器通过模拟彩色图像预测风驱动的空间沉积

Predicting Wind-Driven Spatial Deposition through Simulated Color Images using Deep Autoencoders

Lawrence Livermore National Laboratory(劳伦斯利弗莫尔国家实验室)

M. Giselle Fernández-Godino, Donald D. Lucas, Qingkai Kong

摘要:

几个世纪以来,科学家们一直在观察自然界,以了解支配物理世界的定律。将观察转化为物理理解的传统过程是缓慢的。不完美的模型被构建和测试,以解释数据中的关系。强大的新算法可以使计算机通过观察图像和视频来学习物理。受此想法的启发,我们不是使用物理量来训练机器学习模型,而是使用图像,即像素信息。对于这项工作,作为概念的证明,感兴趣的物理学是风驱动的空间模式。这些现象包括风成沙丘和火山灰沉积,野火烟雾和空气污染羽流的特征。我们使用空间沉积模式的计算机模型模拟来近似来自假设的成像设备的图像,该成像设备的输出是红色、绿色和蓝色(RGB)彩色图像,通道值范围从0到255。在本文中,我们探索了基于深度卷积神经网络的自动编码器,以利用风驱动的空间模式中的关系,这通常发生在地球科学中,并降低其维数。利用编码器减小数据维度大小使得能够训练将地理和气象标量输入量链接到编码空间的深度、完全连接的神经网络模型。一旦实现了这一点,就使用解码器来重构完整的空间图案。我们展示了这种方法的图像的空间沉积从污染源,其中编码器压缩的维数为0.02%的原始大小,和完整的预测模型性能的测试数据实现了归一化均方根误差为8%,在94%的空间品质因数和精度召回曲线下的面积为0.93。

英文摘要:

For centuries, scientists have observed nature to understand the laws that govern the physical world. The traditional process of turning observations into physical understanding is slow. Imperfect models are constructed and tested to explain relationships in data. Powerful new algorithms can enable computers to learn physics by observing images and videos. Inspired by this idea, instead of training machine learning models using physical quantities, we used images, that is, pixel information. For this work, and as a proof of concept, the physics of interest are wind-driven spatial patterns. These phenomena include features in Aeolian dunes and volcanic ash deposition, wildfire smoke, and air pollution plumes. We use computer model simulations of spatial deposition patterns to approximate images from a hypothetical imaging device whose outputs are red, green, and blue (RGB) color images with channel values ranging from 0 to 255. In this paper, we explore deep convolutional neural network-based autoencoders to exploit relationships in wind-driven spatial patterns, which commonly occur in geosciences, and reduce their dimensionality. Reducing the data dimension size with an encoder enables training deep, fully connected neural network models linking geographic and meteorological scalar input quantities to the encoded space. Once this is achieved, full spatial patterns are reconstructed using the decoder. We demonstrate this approach on images of spatial deposition from a pollution source, where the encoder compresses the dimensionality to 0.02% of the original size, and the full predictive model performance on test data achieves a normalized root mean squared error of 8%, a figure of merit in space of 94% and a precision-recall area under the curve of 0.93.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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