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Journal Article: ID no. (ISBN etc.):  0196-2892 BibTeX citation key:  Baup2007b
Baup, F., Mougin, E., Hiernaux, P., Lopes, A., De Rosnay, P. & Chênerie, I. (2007) Radar Signatures of Sahelian Surfaces in Mali Using ENVISAT-ASAR Data. IN Geoscience and Remote Sensing, 45. 2354–2363.
Added by: Devic 2008-07-04 13:09:01    Last Edited by: redelsperger 2008-10-03 14:47:07
Categories: Environment and Climate Monitoring
Keywords: Satellites
Creators: Baup, Chênerie, Hiernaux, Lopes, Mougin, De Rosnay
Collection: Geoscience and Remote Sensing
Bibliographies: Prior150410

Peer reviewed
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Maturity index:  published

This paper presents an analysis of ENSIVAT advanced synthetic aperture radar data acquired over a Sahelian region located in Mali, West Africa. The considered period is 2004-2005 and includes two rainy seasons. Emphasis is put on two ScanSAR modes, namely, the global monitoring (GM) and the wide swath (WS) modes characterized by spatial resolutions of about 1 km and 150 m, respectively. Results show that the WS mode offers better performance in terms of radiometric resolution, radiometric stability, and speckle reduction than the GM mode. The latter is more appropriate for studies at large scale (> 10 times 10 km). In both modes, pronounced angular and temporal signatures are observed for most soil surfaces, and azimuthal effects are observed on markedly orientated rocky surfaces. In contrast, polarization differences (VV/HH) are small during the dry season except on flat loamy soil surfaces. Finally, a relationship is observed between the normalized WS backscattering signal at HH polarization and the surface soil moisture of sandy soils.
Last Edited by: redelsperger