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From: Dan Richter (1:317/3)
To: All
Date: Sun, 23.05.21 13:00
MODIS Pic of the Day 23 May 2021
May 23, 2021 - Tassilli n'Ajjer, Algeria


Algeria, Tassili N

Rich tans, oranges, yellows, and browns wash Algeria’s portion of the
Sahara Desert, especially where the brightly-colored Tifernine Dunes
meet the rugged Tassili n’Ajjer—a dark sandstone plateau that curves
around the edge of the dunes. The rocky plateau stands a few hundred
feet above the surrounding sand seas.

Rich in geologic and human history, Tassili n’Ajjer is a United Nations
Educational, Scientific and Cultural Organization (UNESCO) World
Heritage Site. The geology of Tassili n’Ajjer is complex, with the
plateau composed of sandstone around a mass of granite dating from the
Precambrian. Tassili n’Ajjer translates to “plateau of chasms,” a name
that describes the deep fissures and canyons long ago cut into the rock
by flowing water. The dune field below took shape after an ancient lake
dried up. More than 15,000 prehistoric etchings and illustrations have
been discovered on the cave walls in these rugged rocks, documenting
human presence as far back as 6000 BCE.

On May 20, 2021, the Moderate Resolution Imaging Spectroradiometer
(MODIS) on board NASA’s Terra satellite acquired a stunning true-color
image of the rich colors of Tassili n’Ajjer rising from the dune fields
in Algeria. A few puffy clouds sit over the high plateau, casting
shadows on the sandstone.

Image Facts
Satellite: Terra
Date Acquired: 5/20/2021
Resolutions: 1km (143.1 KB), 500m (365.9 KB), 250m (843.6
Bands Used: 1,4,3
Image Credit: MODIS Land Rapid Response Team, NASA GSFC
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