1. Introduction 2.Restoration Process of Pre-collapse Map 2.1 Pre-collapse map and restoration process 2.2 Making raster data 2.3 Making vector data 3. Making tertain analysis pictures 3.1 Examples of tertain analysis pictures 3.2 The method of making bird's-eye views A,B and C 3.3 Slope classification 4. The result of restoration 5. Utilization of FdTM for geomorphological analysis 5.1 Topographical measurement of collapsed volume 5.2 Consideration of recent mass movements 5.3 Pre-1888 collapse of northern side of Bandai Volcano 6. Concluding Remarks Acknowledgments References