|Nighttime Lights Annual Composites V4
|The National Geophysical Data Center (NGDC) maintains an archive of all data recorded
on the Defense Meteorological Satellite Program (DMSP) satellites as relayed to NGDC
by Air Force Weather Agency (AFWA), previouly referred to as Air Force Global Weather
Central (AFGWC). The Nighttime Lights Time Series files are cloud-free composites
made using all the available archived DMSP-OLS smooth resolution data for calendar
years. In cases where two satellites were collecting data - two composites were produced.
The products are 30 arc second grids, spanning -180 to 180 degrees longitude and -65
to 75 degrees latitude.