The map layer shows the thickness of the upper part of the sediment cover, deposited after the end of last ice age, ca 11000 - 12000 years ago.

Thickness of sediments (superficial deposits) above bedrock in the Oslofjord.

The map application shows geological themes NGU have available and which are of interest within the planning process when it comes to the field of Landscape, Resources and Safety.

Acoustic backscatter. Bottom reflectivity mapped with multibeam echosounder, 10 m grid. The strength of the acoustic signal reflected back from the seabed.

Sediment thickness above bedrock on the Norwegian continental shelf.

The map layer shows grain size composition in upper part of seabed sediments (upper ca 50 cm of the seabed). Grain size as a property describes the percentage of different grain size classes in a sediment or superficial deposit type. The maps are digitized with a view to presentation at a scale of 1:20 000 - 1:150 000 (detailed mapping).

The map layer presents several thousand points with bottom information (grain size and sediment type) in fjords and coastal areas.

Acoustic backscatter. Bottom reflectivity mapped with multibeam echosounder, 50 m grid. The strength of the acoustic signal reflected back from the seabed.