Monitoring flood extent in the lower Amazon River floodplain using ALOS/PALSAR ScanSAR images

► Flood extent was monitored from 2007 to 2010 for a lake in the Lower Amazon Floodplain. ► PALSAR ScanSAR, TM and MODIS images were combined using object-based image analysis. ► Final mapping accuracy was ~ 76% for land cover and ~ 90% for flood status. ► Logistic models predicted flooded area better than polynomial or simple regressions. ► The present method could be used to monitor flood extent for the entire Amazon.