ABSTRACT
This chapter presents a case study of World Heritage Site of Ayutthaya Island, Thailand. The Ayutthaya Island is a flood-prone area and it still suffers from frequent floods. The work undertaken demonstrates significant capability of Structure from Motion (SfM) for extraction of flood watermarks. Eleven flood watermarks were observed by using conventional land surveying or extracted from side-view SfM data. Extracted flood watermarks were then used as benchmark data set for verifying coupled 1D-2D urban flood models. A quintessence of multi-source views (MSV) approach is that it can be used to minimise missing gaps in the single-view topographic data, i.e. top-view light detection and ranging (LiDAR) data. When using the LiDAR-digital building and terrain model (DBM)+ as input, the simulated result of the maximum flood depth may be misrepresented some flood inundation, whereas using MSV-digital elevation model (DEM) as input, the result clearly showed the inundation area.
