This study was supported by the NASA Land Use and Land Cover Change program (NNX09AC39G, NNX11AJ35G), the US National Science Foundation EPSCoR program (NSF-0919466), and the Fundamental Research Funds for Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences (1630022011012, 1630022012019). Landsat imagery is available from the U.S. Geological Survey (USGS) EROS Data Center. The original PALSAR data are provided by JAXA as the ALOS product. We thank two reviewers for their thoughtful and constructive review and comments on earlier version of the manuscript. We thank Melissa Brown for her English editing and comments.