Seabed sediments (grain size) show the grain size composition in the upper part (upper 0-50 cm) of the seabed. The dataset series comprise three datasets: Seabed sediments (grain size), overview, Seabed sediments (grain size), regional and Seabed sediments (grain size), detailed. The three individual datasets are digitized in different scales and have different data coverage.

This dataset shows the strength of the bottom reflectivity. The bottom reflectivity says something about seabed acoustic response, which could give indications about the variations int the types of seabed. Generally, a strong reflection indicate hard bottom, while weaker reflection indicates the softer bottom. Other factors influencing the bottom reflectivity are how well the sediments are sorted and how even the seabed is.