Both Aqua and Terra provide AOD value combining Deep Blue and Dark Target algorithm with corresponding Quality Flag value. They also have Aerosol cloud fraction data for corresponding grids. I want to use these AOD value for estimation of ambient PM2.5. I discarded the cells with QF less than 3 (as suggested by research). My query is whether further filtration of AOD values are required based on Cloud fraction data. That is, whether I have to discard those AOD value for which corresponding Cloud Fraction Value is approx.1.
Hi,
If you are going to use DT AOD, then you should consider AOD for QF = 0.3, OR
If you are going to use DB AOD, then you should consider AOD for QF >= 2, OR
If you are going to use combine DT and DB AOD, then you should consider AOD for QF = 3. No need to discard pixels based on cloud fraction value.
Please see the following publications for more detail.
https://www.researchgate.net/publication/268392439_MODIS_Collection_6_aerosol_products_Comparison_between_Aqua%27s_e-Deep_Blue_Dark_Target_and_%27merged%27_datasets_and_usage_recommendations
https://www.researchgate.net/publication/317060294_New_customized_methods_for_improvement_of_the_MODIS_C6_Dark_Target_and_Deep_Blue_merged_aerosol_product
https://www.researchgate.net/publication/280043154_Evaluation_of_MODIS_aerosol_retrieval_algorithms_over_the_Beijing-Tianjin-Hebei_region_during_low_to_very_high_pollution_events
Regards,
Article MODIS Collection 6 aerosol products: Comparison between Aqua...
Article Evaluation of MODIS aerosol retrieval algorithms over the Be...
Article New customized methods for improvement of the MODIS C6 Dark ...
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