I want to compare concentrations of aerosol constituents across various data resolutions. Is it better to upscale or downscale the resolution to match that of a reference sensor before comparison?
Both have limitations. Down-scaling often leads to higher errors/ mismatch than up-scaling.
You will have to match time and location, consider the sensor differences
K.Krishna Moorthy, I always get confuse between up- and down-scaling. Does down-scaling means to increase pixel resolution? and do you know any method that can preserve spectral properties of an increase pixel resolution?
Heba Marey, do you mean that I have to consider the time and location for radiometric correction? I'm planning to use multi-resolution sensors to improve real-time detection, for example to measure aerosol in the morning and evening of the same day.
Down-scaling would be accurate, provided there is good spatial/ spectral homogeneity, depending in which domain one is down-scaling. Upscaling (from point measurements) would be more accurate, the more the measurement points are
Why not use the NAAPS maps that have already sorted out the aerosols? At http://www.nrlmry.navy.mil/aerosol/index_shortcuts.html go to NAAPS Current, an awesome resource.
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