MTSAT-1R Visible Imager Point Spread Correction Function, Part I: The Need for, Validation of, and Calibration With. - David R. Doelling; Konstantin V. Khlopenkov; Arata Okuyama; Conor O. Haney; Arun Gopalan; Benjamin R. Scarino; Michele Nordeen; Rajendra Bhatt; Lance Avey (IEEE Trans. Geosci. Remote. Sens., 2015)