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In 1995, NGDC researched the calibration of the OLS low light imaging
data and in 1996 conducted experiments with the gain settings on the
OLS and found that it would be possible to generate a radiance calibrated
nighttime lights product. It was found that three gain settings are
required to cover the full dynamic range of observable light from human
settlements. A preliminary global product was made using 28 nights of
data from 1996-97. This preliminary product does not have an atmospheric
correction applied and suffers from low numbers of cloud-free observations
in many parts of the world.
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