Inundation Extent Mapping for Poyang Lake with Digital Elevation Models

In this paper,Landsat TM/ETM+ images taken on 13 different dates were used to pick up the inundation extent and the inundation area were related with the lake levels measured at the 7 hydrological stations.Lake levels from Duchang station have the best correlation with the inundation area.With the contour based digital elevation model(CB_DEM) and CB_DEM,the inundation extent were mapped and compared with the remotely sensed inundation extent.It showes reasonably accurate for high lake levels but not for medium and low lake levels.Boundaries of the remotely sensed inundation extents were labeled with simultaneous lake-level measurements taken at a Duchang hydrological station and interpolated to create a Waterline based DEM(WL_DEM).And the Duchang lake levels and WL_DEM were used to map the inundation extent for medium and low lake level.It showes that the accuracy were improved by using WL_DEM at medium lake levels,but had relatively high errors at low lake levels.