![]() ![]() These two configurations are denoted in the filenames as "vcm" and "vcmsl" respectively. The second includes these data if the radiance values have undergone the stray-light correction procedure (Reference). The first excludes any data impacted by stray light. The version 1 monthly series is run globally using two different configurations. Therefore, it is imperative that users of these data utilize the cloud-free observations file and not assume a value of zero in the average radiance image means that no lights were observed. This can be due to cloud-cover, especially in the tropical regions, or due to solar illumination, as happens toward the poles in their respective summer months. In the monthly cloud-free DNB composites, there are many areas of the globe where it is impossible to get good quality data coverage for that month.
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