Preliminary communication

https://doi.org/10.32909/kg.18.32.1

Retrieval of Aerosol Optical Depth Using Satellite Data Associated with Ground-based Observations over Urban and Rural Areas

Le Thi Le ; Thanh Hoa University of Culture, Sport and Tourism, Vietnam
Hang Thi Thuy Hang ; Vietnam Institute of Geodesy and Cartography, Vietnam
Cuong Xuan Cao ; Hanoi University of Mining and Geology, Vietnam
Nghia Viet Nguyen orcid.org/0000-0001-7010-8613 ; Hanoi University of Mining and Geology, Vietnam
Long Quoc Nguyen orcid.org/0000-0002-4792-3684 ; Hanoi University of Mining and Geology, Vietnam
Ha Thi Thu Le ; Hanoi University of Mining and Geology, Vietnam
Lan Thi Pham ; Hanoi University of Mining and Geology, Vietnam
Canh Van Le orcid.org/0000-0002-8113-9949 ; Hanoi University of Mining and Geology, Vietnam
Lin Tang-Huang orcid.org/0000-0003-1045-3196 ; National Central University, Taiwan

Abstract

Aerosol optical depth (AOD) can be retrieved accurately with sequential ground-based measurements of direct and diffuse solar radiance. However, spatial coverage and location frequency cause certain limitations. Hence, satellite image data are a proper tool for obtaining aerosol optical depth products with more spatial information and patterns of aerosol distribution. Currently, aerosol remote sensing may enhance our understanding of the optimal approach to AOD retrieval over urban and rural areas, and how it differs due to the characteristics of surface reflectivity. The article deals with the concepts of contrast reduction, and dark target approaches are examined using Landsat imaging and the observation of a sun photometer for integrating aerosol optical depth distribution over the city of Taipei in Taiwan. For areas with bright surfaces, such as urban areas, the above concepts were applied using the dispersion coefficient method with a sun photometer, in order to reduce errors considerably in the product. In contrast, a dark target algorithm with a relationship of surface reflectance between the blue (0.49 μm), red (0.66 μm), and infrared (2.1 μm) spectral bands is suitable for moist soils and vegetation areas. The retrieval of AOD spatial distribution is compared with MODIS AOD products and AERONET to verify the accuracy of the results. The RMSE ranged from 0.2 to 0.4, and about 50% of the data were within expected error margins (EE=± (0.05+0.15 AODsunphotometer).

Keywords

aerosol optical depth; aerosol remote sensing; Taipei; Taiwan

Hrčak ID:

225865

URI

https://hrcak.srce.hr/225865

Publication date:

4.10.2019.

Article data in other languages: croatian

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