After Hurricane Ida, New Orleans experienced power outages. The NASA Earth Observatory show the outages by comparing night lights on August 31, 2021 against night lights on August 9, 2021:
VIIRS has a low-light sensor—the day/night band—that measures light emissions and reflections. This capability has made it possible to distinguish the intensity, types, and sources of lights and to observe how they change. The data are then processed by the Black Marble team to account for changes in the landscape (such as flooding), the atmosphere, and the Moon phase, and to filter out stray light from sources that are not electric lights.