Abstract
Flood has much impact on quantity of water resources as well as regional climate and ecosystem. DEM (Digital Elevation Model) plays an important role in describing floodplain inundation dynamics in a river routing model. But satellite DEM has various errors derived from, for example, random radar speckles, vegetation and buildings. These errors extinguish flow connectivity between river channels and the surrounding floodplain. This study focuses on correcting DEM (SRTM and ASTER GDEM) with Hydrogeological Data (HydroSHEDS and GLWD) with DEM correcting algorithm proposed by Yamazaki et al. (2012). This method is designed to remove the pits extinguish flow connectivity as minimizing correction amount using two method, ‘Excavating downstream’ and ‘Filling upstream’. By using GLWD, error derived from vegetation and flood water was removed. With CaMa-Flood, flood analysis model, and corrected DEM, the efficiency of this method is examined.
