Improved rainfall estimates and predictions for 21st century drought early warning
Chris C. Funk, USGS/Earth Resources Observation Systems, Santa Barbara, CA; and P. peterson, S. Shukla, G. Husak, M. landsfeld, A. Hoell, D. pedreros, J. B. Roberts, F. R. Robertson, T. Tadesse, B. F. Zaitchik, J. Rowland, and J. Verdin