Global map of rainfed cropland areas (GMRCA) and statistics using remote sensing - Biradar, Chandrashekhar M.; Thenkabail, Prasad S.; Noojipady, P.; Dheeravath, Venkateswarlu; Velpuri, Naga Manohar; Turral, Hugh; Xueliang Cai; Gumma, Murali K.; Gangalakunta, O.R.P.; Schull, M.A.; Alankara, Ranjith; Gunasinghe, Sarath; et al. (2009)