Validation of MODIS and MISR Based Satellite AOT Data with In- Situ Data for Lahore, Pakistan

M U Khan, B Ghauri, M Bilal

Abstract


Satellite data is important for determination of variations in aerosolsin space and time. The accuracy and validation of satellite data is necessary to evaluate theaccuracy for air quality in a particular region. Satellite derived air pollution measures offer the advantage of providing global coverage. The aerosol optical thickness (AOT) measured from satellite data was validated with the ground based sun photometer AERONETmeasured AOT for Lahore metropolitan city of Pakistan. The satellite based AOT data of MODISand MISR sensors on board TERRA satellite were extracted inradial spatial regions of 25 Km and 44 Km respectively from the AERONET station. The level 2 satellite data and AERONET data products were used for the validation purpose. The green wavelength bands had higher values and good correlation for both MISR and MODIS satellites, having values of coefficient of correlation as 0.86 and 0.84 with RMSE of 0.08 and 0.22 respectively with AERONET mean AOT data measured for 2 hour (± 1hour) time interval centered at satellite pass time.Thus proving the validity of aerosol satellite data as proxy to ground measurements.

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