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|bay = fjord
|Long, narrow inlet with steep sides or cliffs, created by glacial erosion.
|Used on these elements
|Status: in use
|Tools for this tag
A fjord is a long, narrow inlet with steep sides or cliffs, created by a glacier.
Note: Fjords can exist both in the sea and in freshwater/lakes.
How to map
The following options are sometimes used:
- large fjords (such as the 179 km long Hardangerfjorden) are sometimes mapped as an area with a closed way or multipolygon, following the coastline or using a simplified geometry.
- smaller fjords are sometimes mapped as area, either a closed coinciding with the coastline or as a multipolygon using the coastline directly.
- Many fjords area mapped as linear ways, particularly narrow fjords without branches.
- branches with a separate names may have a separate way connected to the main branch/trunk of the fjord.
- branches are sometimes collected in a relation, together with the main branch/trunk of the fjord, in order to indicate separate names for each branch but still indicate which fjord they belong to.
- Small fjords may be mapped using a single node.
- Nodes may also be used when the extent of the fjord is not certain
Pros and cons
- Using an area with "simplified geometry" of large fjords mapped as areas may generate redundancy (since the more detailed coastline is already there).
- Using "simplified geometry" may make it harder to maintain the coastline and the shape of the fjord.
- Using ways is faster and easier than making a separate area or multi-polygon.
- Using area instead of a linear way makes it easier to calculate the area of the fjord.
- Using area instead of a linear way makes it easier to determine whether an island or other feature is within or next to a specific fjord.
- name=* - name of fjord