Sentences with phrase «sun photometers»
AAOD is derived by AERONET, a ground - based network of instruments called sun photometers that are used to calculate how much aerosols block the sun's energy as it passes through the atmosphere, and also from an Aura satellite instrument known as OMI.
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Measurements from ground - based sun photometer networks can be used both to provide a ground - truth validation of satellite aerosol retrieval sand to produce a land - based aerosol climatology which is complementary to satellite retrievals that currently are being performed mostly over ocean.