Abstract
In the standard MODIS Collection 5 aerosol retrieval algorithm, estimates of the surface albedo between the VIS and MIR channels must be made. Unfortunately, the operational model used is not suitable for urban areas and efforts to modify the required VIS-MIR surface spectral ratios for urban areas are needed to remove aerosol retrieval biases. To address these issues, we use results based on the ASRVN product to provide regionally tuned surface reflection ratios Using these values removes retrieval bias and improves resolution to 1.5 km. In addition, we note explore the relationships for multiple urban sites and illustrate a general correspondence between the surface reflection ratiosn and biases in AOD retrieval. Further validations of the surface reflection differences in urban areas are illustrated using high resolution LANDSAT 7 imagery for vegetation / urban boundaries.
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