22,000 km² of Greenland’s coastal caters mapped using satellite data

01-09-2025

The Danish Geodata Agency has, through a new pilot project, mapped 22,000 km² of nearshore waters in Greenland in areas around Nuuk–Maniitsoq, Tasiilaq, and Ittoqqortoormiit. The data are now publicly available via the Greenlandic data platform NunaGIS.

The aim of the pilot project is primarily to test the technology and assess user needs. The overall purpose of the mapping is to strengthen navigational safety, search and rescue capacity, and maritime infrastructure in Greenland. In September, the Danish Geodata Agency will hold meetings in Nuuk and Tasiilaq, where the pilot project results will be presented to relevant users and stakeholders.

Focus on navigational safety

The background for the pilot project, which began in 2023, is the increasing vessel traffic in the Arctic. Many coastal areas in Greenland have so far remained unmapped, creating challenges for safe navigation. The project has demonstrated that satellite technology now makes it possible to identify tidal zones, delineate coastlines more precisely, and highlight high-risk areas.

Close collaboration has been established with Asiaq, with the purpose of making the data freely accessible both via NunaGIS—the platform that provides public, private, and governmental access to maps and geospatial data across Greenland—and the Danish Geodata Agency’s website.

- At Asiaq we are very pleased with the collaboration with the Danish Geodata Agency and that, through NunaGIS, we can help make the new data easily accessible in Greenland. Knowledge of shallow waters and skerries is vital for safe navigation, and given the great distances in this country it is important to explore and utilise the opportunities satellite technology offers. This project is an excellent example of that, says Mette Skarregaard Pedersen, Director of Asiaq.

Benefits for mariners and authorities

The mapping provides new tools for local mariners, commercial operators, and authorities. The data can be used for voyage planning, search and rescue (SAR), and to support overall maritime infrastructure. While the results are based on a pilot project and therefore are not integrated into official nautical charts - and are not intended for navigational use - they contribute valuable knowledge in areas where data have previously been insufficient or outdated.

The Danish Geodata Agency is also working to establish cooperation with major commercial partners such as Garmin and Navionics, so that in the future the data may be incorporated into the systems used daily by many mariners. In the longer term, the project is expected to contribute to the development of international standards for the use of satellite data in nearshore mapping across the Arctic.

- With this pilot project, we are taking an important step towards improving navigational safety in Greenland’s coastal waters. The mapping provides local users with access to data that has not been available before and at the same time establishes a solid foundation for future work, says Christian Thellufsen, Senior Advisor at the Danish Geodata Agency.

The results of the pilot project provide a strong basis for exploring and developing new methods of coastal mapping. At the same time, they pave the way for closer collaboration with both local stakeholders and international partners to ensure safer navigation in the future.

Contact

Christian Thellufsen
Senior Advisor at the Danish Geodata Agency
E-mail: chthe@gst.dk
Phone: +45 72 54 50 66