Using Landsat and soil clay content to map soil organic carbon of oxisols and Ultisols near São Paulo, Brazil - Padilha, Manuela Corrêa de Castro; Vicente, Luiz Eduardo; Demattê, José Alexandre Melo; Loebmann, Daniel Gomes dos Santos Wendriner; Vicente, Andrea Koga; Salazar, Diego Fernando Urbina; Guimarães, Clécia Cristina Barbosa (Geoderma Regional, 2020)