Atmospheric Correction Algorithms Intended for Air Pollution Monitoring in Cyprus using Satellite Remotely Sensed Data

摘要

By comparing the reflectances of the targets found from the image i.e. after atmospheric correction and the one found from ground measurements; this will give the opportunity to assess the existing atmospheric correction methods and develop a more effective method. Then by determining the atmospheric path radiance, the aerosol optical thickness can be retrieved using standard radiative transfer equations. These retrieved aerosol optical thickness can be directly compared with the values found from the sun-photometer measurements as well those found from the visibility data obtained during the satellite overpass. The aerosol optical thickness derived from the atmospheric path radiance can be used as a tool of assessing atmospheric pollution after correlating with some air pollutants such as CO2, NO2, and PM10. This research presents the results obtained by using the MICROTOPS II sun-photometer for retrieving the aerosol optical thickness; measuring air-pollutants and measuring the spectral-reflectance using field spectro-radiometers during the satellite overpass for an urban area in Cyprus. AOT values from MICROTOPS sun-photometers (collected during the satellite overpass) have been found to be very similar to those AOT found from the Landsat TM images over Paphos International Airport area after applying the atmospheric correction suggested by Hadjimitsis and Clayton (2009). Linear regression between the AOT found from sun-photometers and the PM10 values acquired at the same time shows good correlation coefficients of 0.60-0.63 for bands 500, 675, 870 and 936 nm.