Revised Method for Detailed Mapping of Engineering Geomorphologic Classification Using High Resolution Satellite Image and Digital Elevation Model

Abstract

For detailed seismic hazard mapping, the revised method to construct the 50m-mesh engineering geomorphologic classification map is proposed using the existing 250m-mesh map, high resolution satellite (QuickBird) image and digital elevation model (DEM). The spatial spectral characteristics of the satellite image at different geomorphology units are examined by using two-dimensional Fast Fourier Transformation (2D-FFT). The 50m-mesh map for Tsurumi ward, Yokohama is constructed based on the spectral decays computed by 2D-FFT and the topographic information for each geomorphologic unit. The map is compared with the manually classified map, showing the accuracy rate of 85% over the area.