remote sensing Article Retrieval of Fine-Resolution Aerosol Optical Depth (AOD) in Semiarid Urban Areas Using Landsat Data: A Case Study in Urumqi, NW China Xiangyue Chen 1,2,3, Jianli Ding 1,2,3,*, Jingzhe Wang 4 , Xiangyu Ge 1,2,3, Mayira Raxidin 1,2,3, Jing Liang 5, Xiaoxiao Chen 1,2,3, Zipeng Zhang 1,2,3, Xiaoyi Cao 1,2,3 and Yue Ding 3 1 Key Laboratory of Smart City and Environment Modelling of Higher Education Institute, Xinjiang University, Urumqi 800046, China;
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[email protected] (X.C.) 2 Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830046, China 3 College of Resources and Environment Sciences, Xinjiang University, Urumqi 830046, China;
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[email protected]; Tel.: +13579265967 Received: 31 December 2019; Accepted: 31 January 2020; Published: 2 February 2020 Abstract: The aerosol optical depth (AOD) represents the light attenuation by aerosols and is an important threat to urban air quality, production activities, human health, and sustainable urban development in arid and semiarid regions. To some extent, the AOD reflects the extent of regional air pollution and is often characterized by significant spatiotemporal dynamics.