Aorounga crater, Chad

Sentinel-2 MSI acquired on 27 December 2017 at 09:13:59 UTC
Sentinel-1 CSAR IW acquired on 29 June 2018 at 04:36:01 UTC
Author(s): Sentinel Vision team, VisioTerra, France - svp@visioterra.fr
Keyword(s): Impact crater, geology, land, asteroid, wind erosion, rings, desert, Chad, Sahara
Fig. 1 - S1 (29.06.2018) - vv,vh,ndi(vv,vh) colour composite - Aorounga crater is at most 345 million years old, its outer ring is 12.6 km wide..
3D view
Fig. 2 - S2 (27.12.2017) - 4,3,2 natural colour - Aorounga crater lies 100 km SE of Emi Koussi volcano, the top of the Tibesti range & Sahara.
3D view
Erosion of exposed rock layers by a unidirectional wind formed these linear rock ridges alternating with light orange sand deposits called yardangs.
Fig. 3 - vv,vh,vv colour composite - Its central highland is surrounded by a small sand-filled trough surrounded by a larger circular trough.
3D view
Fig. 4 - 11,8,2 colour composite - The north-east wind causes sand dunes formed between the yardangs to migrate to the south-west.
3D view
The views expressed herein can in no way be taken to reflect the official opinion of the European Space Agency or the European Union.
Contains modified Copernicus Sentinel data 2024, processed by VisioTerra.
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