OBJECT-BASED CLASSIFICATION AND CHANGE DETECTION OF HOKKAIDO, JAPAN

This study consists of two parts in the issue of flood change: hazard assessment (Part 1) and risk assessment (Part 2). Part 2 focuses on estimating nationwide flood risk in terms of affected people and rice crop damage due to a 50-year flood hazard and quantifying flood risk changes. The preliminary results show that a tendency of flood risk change strongly depends on the temporal and spatial dynamics of exposure and vulnerability such as distributed population and effectiveness of water infra.