Dry-season vegetation mass and cover fraction from SWIR1.6 and SWIR2.1 band ratio: Ground-radiometer and MODIS data in the Sahel. - Laurent Kergoat; Pierre Hiernaux; Cécile Dardel; Caroline Pierre; Françoise Guichard; Adamou Kalilou (Int. J. Appl. Earth Obs. Geoinformation, 2015)