Relative bottom hardness, open data

Relative bottom hardness is raster data showing reflectivity strength from the seabed. Reflectivity strength says something about the acoustic response of the seabed, which may give indications about the nature of the seabeds. In general, a strong back reflection will indicate hard bottom, while weaker reflection indicates softening the bottom. The nature of the seabed, interpreted from reflectivity, gives indications of the type of sediment and thus also information about sedimentation conditions and processes at the bottom.