Key:tidal
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Description |
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An area in the tidal range. ![]() |
Group: marine |
Used on these elements |
Useful combination |
See also |
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Status: de facto |
Tools for this tag |
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The tag tidal=yes
indicates that an element is in the tidal range. It could be a river, a shore, a part of a harbour or a water area.
When the part of the harbour has a gate which does not let the tide in you may tag it with tidal=no
. But this is the default value so it is not really necessary.
How to map?
River
waterway=river
+name=*
+tidal=yes
natural=water
+water=river
+tidal=yes
If you know where are the limits of the tide and of the river (because you have imagery at low tide and another at high tide), you can add 3 areas (closed ways or multipolygons), one for the river's water body and 2 (one on each side of the river) with tags natural=wetland
+ wetland=tidalflat
(if these are muddy areas: you don't need in this case of tidal=yes) or natural=sand
+ tidal=yes
(if areas are sandy) or natural=shingle
+ tidal=yes
or any other tags (according to the type of soil) + tidal=yes
.
Tidal area at sea
Areas in the tidal range between mean high water springs (
natural=coastline
) and mean low water springs can be tagged with
tidal=yes
to explicitly indicate this.
natural=bare_rock
+tidal=yes
natural=sand
+tidal=yes
Beaches can be partially or fully under water at high tide, thus natural=beach
areas may extend beyond the natural=coastline
. However, natural=beach
is specifically for inclined, wave formed areas of loose sand or stones. Other types of terrain exposed at low tide should not use this tag.
If the foreshore is a mudflat, you may use the tags
natural=wetland
+ wetland=tidalflat
. These tags already imply that the area is in the tidal range so you don't need of tidal=yes.
Values
Value | Description |
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yes | Indicates that an area is in the tidal range. The top of the tidal range is generally taken to be at natural=coastline ; i.e. the mean high-water springs (MHWS).
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no | Default. Disambiguates whether item is not in the tidal range or has not been considered for tagging. Not explicitly required. |
You can also add the type of this area: