A global map of rainfed cropland areas at the end of last millennium using remote sensing and geospatial techniques - Biradar, Chandrashekhar M.; Thenkabail, Prasad S.; Turral, Hugh; Noojipady, Praveen; Jie, Li Yuan; Velpuri, Naga Manohar; Dheeravath, Venkateswarlu; Vithanage, Jagath; Schull, M.; Cai, X.L.; Gumma, Murali K.; Rishiraj, D. (2006)