Proposal:Directional
| Flow Direction | |
|---|---|
| Proposal status: | Abandoned (inactive) |
| Proposed by: | pnorman |
| Tagging: | directional=yes/no/tidal/-1 |
| Applies to: | 
|
| Definition: | A way to indicate directional or non-directional flow |
| Statistics: |
|
| Rendered as: | Arrows pointing in the direction of flow |
| Draft started: | 2011-03-21 |
| RFC start: | 2011-04-01 |
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
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