基于无人飞行器获取的图像,采用物理学指导的自动机器学习方法获取晴天的地表辐射温度

IF 7.1 1区 地球科学 Q1 ENVIRONMENTAL STUDIES Computers Environment and Urban Systems Pub Date : 2024-08-17 DOI:10.1016/j.compenvurbsys.2024.102175
Xue Zhong , Lihua Zhao , Peng Ren , Xiang Zhang , Jie Wang
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引用次数: 0

摘要

城市地表辐射温度近似于地表动能温度,主要通过卫星或无人飞行器(UAVs)获取,并表现出明显的时空变化。尽管通过无人飞行器获取城市微尺度地表辐射温度的方法很多,从经验模型到物理模型不等,但由于物理意义有限,且方法应用存在大量专业障碍,因此挑战依然存在。在此背景下,本研究介绍了一种新颖而直接的方法,用于获取晴天的空间分布辐射温度,而无需了解复杂的辐射传递过程以及获取低空大气参数。采用自动机器学习来训练一个能够有效估计辐射温度的模型。根据城市辐射传递方程创建了训练和测试数据集,其中包含三个独立变量:无人机测量的地表亮度温度、宽带辐射率和天空视角系数共同代表了晴朗的过渡季节和夏季不同地表特征和城市布局的各种热环境。随后,通过与无人机采集的多模态图像中获取的辐射温度和地面同步采集的四个时段的动力温度进行直接比较,证实了该模型的准确性。结果表明,AutoGluon 实现了高精度(MAE:0.04 K;RMSE:0.06 K;R2:0.99)。额外的地面测量验证进一步证明了该模型的可靠性,日照表面的绝对偏差保持在 1.25 K 以内。鉴于该模型能够实时、高空间分辨率地绘制具有相当大异质性的城市微尺度辐射温度图(4 月测试:8.70 厘米,7 月测试:6.89 厘米),这种方法有望成为动态监测和管理城市微尺度热环境的有效工具。
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A physics-guided automated machine learning approach for obtaining surface radiometric temperatures on sunny days based on UAV-derived images

Urban surface radiometric temperatures, approximate to the surface kinetic temperatures, are predominantly retrieved using satellites or unmanned aerial vehicles (UAVs) and exhibit pronounced spatiotemporal variations. Despite numerous methods ranging from empirical to physical models for obtaining urban microscale surface radiometric temperatures via UAVs, challenges remain given the limited physical significance and substantial professional barriers to method application. Against this background, this study introduces a novel and straightforward approach for acquiring spatially distributed radiometric temperatures on sunny days without understanding the complex radiative transfer process as well as acquiring low-altitude atmospheric parameters. An automated machine learning was employed to train a model capable of efficiently estimating radiometric temperatures. Training and testing datasets were created based on the urban radiative transfer equation, incorporating three independent variables: UAV-measured surface brightness temperature, broadband emissivity, and sky view factor, which collectively represent the diverse thermal environments across different surface characteristics and urban layouts during sunny transitional and summer seasons. The model's accuracy was subsequently confirmed through direct comparisons with radiometric temperatures retrieved from UAV-collected multimodal images and kinetic temperatures synchronously collected on the ground across four periods. The results indicate that AutoGluon achieved high accuracy (MAE: 0.04 K; RMSE: 0.06 K; R2: 0.99). Additional ground measurement validations further demonstrated the model's reliability, with absolute biases on sunlit surfaces maintained within 1.25 K. Given its capability for real-time, high-spatial-resolution mapping of radiometric temperatures (April test: 8.70 cm, July test: 6.89 cm) in urban microscales with considerable heterogeneity, such a method is envisioned to be an effective tool for the dynamic monitoring and management of thermal environments at the microscale level in urban settings.

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来源期刊
CiteScore
13.30
自引率
7.40%
发文量
111
审稿时长
32 days
期刊介绍: Computers, Environment and Urban Systemsis an interdisciplinary journal publishing cutting-edge and innovative computer-based research on environmental and urban systems, that privileges the geospatial perspective. The journal welcomes original high quality scholarship of a theoretical, applied or technological nature, and provides a stimulating presentation of perspectives, research developments, overviews of important new technologies and uses of major computational, information-based, and visualization innovations. Applied and theoretical contributions demonstrate the scope of computer-based analysis fostering a better understanding of environmental and urban systems, their spatial scope and their dynamics.
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