Retrieving Aerosol Optical Depth Over A Desert City Using High Spatial Resolution Landsat-8 OLI Data

Authors: Abdelgadir Abuelgasim*, United Arab Emirates University
Topics: Arid Regions, Environment, Applied Geography
Keywords: Aerosol optical depth, air pollution, urban areas, arid and semi-arid regions,
Session Type: Guided Poster
Day: 4/4/2019
Start / End Time: 3:05 PM / 4:45 PM
Room: Roosevelt 3.5, Marriott, Exhibition Level
Presentation File: Download

Aerosol optical depth (AOD) products based on orbiting coarse resolution satellites such the Moderate Resolution Imaging Spectroradiometer (MODIS) can provide global and regional daily AOD distributions, however. The application of such products to air quality monitoring at local scales such as urban environments is rather limited due to their extremely coarse spatial resolution. As such there has been a growing research interest in retrieving AOD products based on high resolution optical imagery. The primary objectives of this research study are to assess AOD retrieval over a desert urban city using high spatial resolution satellite imagery. With the assumption of Lambertian surface, the principle of AOD retrieval developed is based on the radiative transfer theory using Tanré Equation. To solve the radiative transfer equation, the study adopted the radiative transfer model Second Simulation of the Satellite Signal in the Solar Spectrum (6S) and constructed a Look-Up-Table (LUT) assuming a continental aerosol model. The land surface reflectance (LSR) over the entire study period using Landsat 8 OLI for the period 2016-2017 showed very little variability. The retrieval of AOD is performed by comparing measured and simulated TOA reflectance. The validation is performed using an AERONET Masdar Institute ground based site located within the study area. The validation shows that AOD retrieval approach yields a root mean square error (RMSE) of .13, a good correlation with an R2 equivalent to 78% and that the developed approach can provide much more details compared to the 10 km MODIS AOD products.

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