A Method for Reconstructing 3D Seabed Digital Map Based Upon Image Processing

Terrain aided underwater navigation is a new direction of navigation technology.A 3D underwater Digital Map is the basis of analyzing terrain matching algorithms.Aiming to get a 3D seabed digital map which fits the precision requirement of matching,a method of how to reconstruct the Digital Elevation Model(DEM)was put forward on the basis of sea-floor terrain image of GeoTIFF file.Firstly getting the colour information and geography information.Secondly generating the Grid DEM of depth data based upon digital image processing method and then smoothing with an interpolation algorithm.At last,a 3D seabed digital terrain is reconstructed and a matching simulation is carried out.The simulation results demonstrate that the 3D seabed Digital Maps is effective,and it provides a method to analyse the sea-floor terrain matching algorithm.