Cities and towns darkened after a cyclone unleashed torrential flooding along the country’s coast. On September 10, 2023, a powerful storm brought heavy rain to northeastern Libya, causing significant loss of life and devastation to cities along the coast. Data from satellites show that after the
The city became significantly darker after the storm hit. In a recent
, UNOSAT documented changes in Derna’s brightness. UNOSAT uses Black Marble nighttime light products to support ground teams in disaster response.Some communities near Derna wentwithout electricity, according to NPR reporting. But by September 18, 2023, the brightness of outdoor lighting in Derna was approaching pre-storm levels. “There’s a lot more recovery compared to the September 13 image,” said Shrestha.
Raw, unprocessed images of night lights can be misleading because moonlight, clouds, air pollution, snow cover, seasonal vegetation, and even the position of the satellite, can change how light is reflected. The Black Marble science team processes the data to account for these factors. NASA Earth Observatory images by Wanmei Liang, using Black Marble data courtesy of Ranjay Shrestha and Zhuosen Wang/NASA Goddard Space Flight Center, Landsat data from the U.S. Geological Survey, and data from OpenStreetMap.
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