Seabed sediments (grain size), detailed


This data set contains the grain size composition of seabed sediments upper part (top 0-50 cm of the seabed). Grain size data are based on analyzes of seabed samples, analysis and interpretation of digital reflectivity data and interpretation of analog and digital seismic data. Detailed water depth data (bathymetry) and video of the seabed has been used in the interpretation.

Specific usage

This data set can be used as basis for decision making in the overall land use and environmental planning, habitat mapping, vulnerability analyzes, impact analysis in connection with installations on the seabed etc. Map showing sediments classified by grain size gives a good overview of the depositional environment and seabed conditions.


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Contact information

Logo Norges geologiske undersøkelse

Contact metadata:
Janne Grete Wesche, – Geological Survey of Norway

Contact owner:
Oddvar Longva, – Geological Survey of Norway

Contact publisher:
Aave Lepland, – Geological Survey of Norway


Spatial representation: Vector

  • FGDB 10.2
  • Shape 10.2
  • SOSI 4.5

Distribution type: External download site

Reference systems:
  • EUREF89 UTM sone 32, 2d
  • EUREF89 UTM sone 33, 2d
  • EUREF89 UTM sone 35, 2d
  • WGS84 UTM sone 32, 2d
  • WGS84 UTM sone 33, 2d
  • WGS84 UTM Zone 35, 2d
  • WGS84 Geografisk


Use limitations: The level of detail in the data set indicates use within the map scale: 1: 20,000 to 1: 150,000

Access constraints: Open data

Use constraints: License

Licence: Norsk lisens for offentlige data (NLOD)

Security constraints: Unclassified


The data set covers only certain areas in Norwegian fjords and seas near the coast, where various mapping projects have provided detailed information about the seabed. The data set contains areas that have been mapped at different levels of detail.