National shoreline

Since 2005, the Swedish Maritime Administration and Lantmäteriet have jointly run the National Shoreline (NSL) project, which will build, maintain and manage a common and basic version of Sweden's shoreline. The construction phase was completed in early 2020, and work is now continuing with updating and management.

Land-water conditions are not stable. Over time, land uplift, human intervention and erosion change both shorelines and depth conditions. At the same time, our measurement technology and old data are refined. can prove to be incorrect.

NSL has been built up everywhere where commercial shipping is conducted, which is why the project includes not only the coast of Sweden but also the largest lakes: Lake Vänern, Lake Vättern, Lake Mälaren and Hjälmaren, and the Göta Canal. assumed Lantmäteriet s most detailed description of the shoreline. Based on the Lantmäteriet conducted an additional mapping of objects such as bridges, piers, fenders, trusses and other specific objects that are not originally included in the Lantmäteriet s mapping.

Thereafter, the Swedish Maritime Administration has proofread the mapped material and any adjustments were made before it was finally ch eckas in. It is a precision job to be able to measure the different objects in a stereo model. The most difficult thing is to determine how much a stone stands out above the water surface and then classify it correctly. Is it a surf or an overwater rock?

The NSL objects are included as part of the topography in the product Topography 10 Download, vector The objects are divided into a number of different information layers and can not be provided separately.

You can find more information about NSL at Sjöfartsverket's website (new window, in Swedish) .

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