Several cities on the west coast of Florida lost much of their electric power for days after the storm. Hurricane Ian roared across Florida over September 28–29, 2022, as one of the most powerful storms ever to make landfall in the state. The category-4 hurricane hit the southwestern coast of Flo
at NASA’s Goddard Space Flight Center, Science Systems and Applications, Inc. , and the University of Maryland, College Park processed VIIRS data to show lights before and after Hurricane Ian passed through the cities. Data from September 30 were compared to a pre-storm composite and overlaid on landcover data collected by Landsat 8 and 9.
The VIIRS day/night band makes it possible to detect the intensity of lights and observe their variations. Relief agencies sometimes use nighttime imagery to identify areas that are most in need of aid and support.
Precision is crucial for studies with night lights. Raw, unprocessed images can be misleading because moonlight, pollution, clouds, seasonal vegetation—even the position of the satellite—can change how light is reflected and can distort observations. The processing by the Black Marble team accounts for such variations and filters out stray light from sources that are not electric lights.
NASA Earth Observatory images by Joshua Stevens, using Black Marble data courtesy of Ranjay Shrestha/NASA Goddard Space Flight Center, Landsat data from the U.S. Geological Survey, and data from OpenStreetMap.
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