MERIT DEM: Multi-Error-Removed Improved-Terrain DEM

Résumé: 

Dai YAMAZAKI is an Associate Professor at the Institute of Industrial Science (University of Tokyo) and Invited Scientist at JAMSTEC- Japan Agency for Marine-Earth Science and Technology (Department of Integrated Climate Change Projection Research). His major research topic is hydrodynamic modeling of surface waters at the global scale. The physics of surface water flow is relatively simple, but considerable efforts are required to represent complex river and floodplain topography which governs the surface water flow. His approach is the full-use of high-resolution satellite-based hydrographical datasets, which are available at the global scale. The goal of his study is to realistically simulate/predict the surface water hydrodynamics (river discharge, water level, flooded area) by proper approximation of the river and floodplain topography.

In addition to the global hydrodynamic modeling work, the global-scale observation of surface waters is essential to understand the global hydrodynamics. He uses some satellite products (DEM, water mask, inland water altimetry) for the validation, calibration, and the development of the global hydrodynamic model. He developed the global Digital Elevation Model called MERIT DEM (Multi-Error-Removed Improved-Terrain DEM, https://doi.org/10.1002/2017GL072874) freely available at global scale, and resolution of 3 arc-sec (~90 m at the equator), the Global Water Body Map at 3 (G3WBM) and 1 arc-sec (G1WBM), and the global river width database for large rivers at 3 arc-sec (http://hydro.iis.u-tokyo.ac.jp/~yamadai/GWD-LR/index.html). His is going to present us his brand new product MERIT DEM - Hydrology, which includes flow directions and flow accumulations.

Auteur: 
Dai YAMAZAKI
Affiliation: 
Institute of Industrial Science, University of Tokyo
salle Darcy (Tours 46-56, 3e étage)
Vendredi, 15 juin, 2018 - 10:00