RS/GIS FOR FLOOD RISK MANAGEMENT IN SUKHOTHAI PROVINCE

摘要

Typical rainfall, particularly during September in each year, causes floods with inundating damaging in Sukhothai province. With the advent of state of the art in radar RS technology, we can obtain the image, regardless of day or night or even cloud piercing period of time. This application gains more popularity recently. In this study, the author employs 3-multitemporal of SAR data and 2-multispectral optical images from RADARSAT and Landsat-5 respectively. The images had been acquired during the inundation of Sukhothai province from the period of 2002 up to 2006. The images were firstly rectified and then being subtracted, the SAR images being filtered, hence, yielded the extracted inundated area.After the post classification processing, the overlays amongst the five-date classified images, were applied with the frequency of flooded and flood risk area had been successfully extracted. The outcome of the processing will enable both government and local authority in the decision making concerning flood disaster prevention and mitigation.