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Peaks and polygons representing undersea mountains are created using automated methods. The workflow includes the use of a number of GIS tools for the recognition of morphological units from bathymetry data, as well as automated delineation of elevated terrain and localization of mountain peaks.

Delineation of mountain polygons and further classification of peaks on flat seabed or in rugged terrain is based on a morphological “geomorphon” analysis of bathymetry data and derived data. An important derived data set is the height relative to the directional median value of the depth. This is used both in the morphological analysis and for characterizing the height of peaks and polygons above the surrounding seabed. Furthermore, specialized geomorphological tools for delineation and characterization of morphological units are applied to results from “geomorphon” analyses. Further filtering of these results using GIS tools removes peaks and polygons that are poorly defined or not relevant in the Undersea mountains map product. The data base for each mountain peak was calculated from the GEBCO_2024 type identifier grid (TID) by calculating the majority class and percentage within a 20 km circular buffer around each mountain peak. The quality property gives an indication of how confident one can be about the position and morphology.

The Undersea mountains dataset is in vector format. A SOSI standard for theme codes and properties has not yet been established.
Geology Habitats and biotopes Sea regions Mareano Geologi Landskap marine terrain mauntain depth height neighbouring terrain seamount Mareano GEBCO modellering National geoscientificInformation
The dataset indicates the presence of undersea mountains in the Barents Sea, the Norwegian Sea, and the North Sea. Point data show peaks – their height, depth, and surrounding terrain. Polygon data delineate elevated terrain at a coarse scale (1:2 000 000) and provide extended information about the extent and shape of each undersea mountain. Mapping has revealed a number of high mountains over 1,000 meters, often called seamounts, which may play an important role in marine ecosystems. However, most are lower than this. The data were compiled by the Geological Survey of Norway, based on analysis of a compiled bathymetry dataset from 2024.
Undersea mountains