Ancient drainage systems in Niger

Sentinel-1 CSAR IW acquired on 01 December 2017 from 17:07:48 to 17:08:38 UTC
Sentinel-1 CSAR IW acquired on 04 December 2017 from 17:31:57 to 17:32:22 UTC
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Sentinel-1 CSAR IW acquired on 11 December 2017 at 17:23:11 UTC
Author(s): Sentinel Vision team, VisioTerra, France - svp@visioterra.fr
Keyword(s): Land, hydrology, mountains, drainage system, erosion, erg, desert, Sahara, Sahel, Tenere, Niger
Fig. 1 - 04 & 09.12.2017 - vv,vh,ndi(vh,vv) - Aïr Moutains are a precambrian plateau encompassing flat round granite intrusions.
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Niger became an independent republic the 15.12.1958. This story highlights its valleys & wadis now partly buried by ergs, clues of a greener past.
Fig. 2 - 01 & 06.12.2017 - North-east section of the Djado Plateau shows its large sand-filled drainage system.
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Fig. 3 - 01 & 06.12.2017 - The south-west section shows smaller, wind-eroded, river systems sinking in the Tenere sand sea.
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Fig. 4 - 11.12.2017 - Between Sahara & Sahel, drainage of the heavily eroded black sandstone of Termit Massif points SE & SW.
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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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