Handling of high resolution DTM to detect obstacles and map sea flooding. Examples on the French Mediterranean Coast

Abstract

During the implementation of the EU Flood directive, high resolution (Lidar) digital terrain models (DTM) were produced massively on nearly all the French coast. With those date, the methods used to map sea flooding on the Mediterranean coast were the simple superposition of a sea level on the natural terrain. The methods currently implementing allow, comparing the previous results and the areas actually connected to the sea for a given level, to determine the protected area for this level. The next step is to determine, where appropriate, the protection system. The algorithm developed for this purpose can locate it and determine its level of protection.