Multispectral Transform and Spline Interpolation for Mapping Flood Damages

In this paper are described some enhancements for a straightforward method recently developed by the authors for evaluating post flood damages using Landsat TM/ETM+ data integrated with digital terrain models (DTMs) and based on the principal components transform (PCT). In particular, the main updates refer to the computational scheme in deriving the flood extension map with the use of the minimum noise fraction (MNF) transformation and in estimating the peak water height and the volumes involved through the use of spline interpolators. Compared with the PCT-based method, the enhanced technique results in improved mapping accuracy.