Proposed features/directional

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Flow Direction
Status: Abandoned (inactive)
Proposed by: pnorman
Tagging: directional=yes/no/tidal/-1
Applies to: Way
Definition: A way to indicate directional or non-directional flow
Rendered as: Arrows pointing in the direction of flow
Drafted on: 2011-03-21

Proposal

To define a tag to indicate when a waterway has no dominant flow direction.

Rationale

By convention the direction of the way should be downstream (ie draw the way in the direction that the water flows), when known. This leads to a problem where there is no way to indicate that a waterway does not have a direction of flow.

Tagging

directional=yes to explicitly indicate that a waterway has directional flow. Most waterways are directional

directional=no to indicate that a waterway has no directional flow. An example is irrigation ditches where the flow is controlled by valves.

directional=tidal to indicate that a waterway's flow is dominated by tidal influences

directional=-1 to explicitly indicate that a waterway has directional flow in the reverse direction of the way. This is not expected to be frequently used.

Unknown values should be regarded as a special case of directional=no

Applies to

waterway=stream

waterway=river

waterway=canal

waterway=ditch

waterway=drain

Rendering

Suggested rendering is arrows in the direction of flow if directional, no arrows if not.


See also

http://trac.openstreetmap.org/ticket/3198

http://lists.openstreetmap.org/pipermail/talk-ca/2011-February/003721.html

http://lists.openstreetmap.org/pipermail/tagging/2010-August/004149.html

http://lists.openstreetmap.org/pipermail/talk-us/2011-February/005275.html

http://lists.openstreetmap.org/pipermail/tagging/2011-March/007212.html