Key:line_management
 line_management
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| Description |
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Describes particular topologies of lines around their supports or significant points along their path 
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| Group: infrastructure |
| Used on these elements |
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| Documented values: 7 |
| Useful combination |
Status: approved
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| Tools for this tag |
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Line management refers to particular topologies of overhead lines or underground cables. It often applies to utilities networks with power or telecom lines.
The values below are intended for power networks, but their use may be extended to other activities, if suitable.
Tagging
It was proposed to use a new line_management=* key to free tower:type=* and pole:type=* from defining how lines are arranged. This would allow us to keep tower:type=* to define tower shapes and to extend line management concepts to other types of support such as poles, portals or even terminal anchors. Current available tagging describes these situations globally without any specific terminology regarding power nor telecom. This key is mainly applicable to utility networks and it can easily be extended, with more specific terms, to other fields as well.
Simple supports, with no particular line management focus, should not be tagged with the line_management=* key or default straight.
Advanced usage
Level composition matrix
As many situations exists in reality, it can be useful to combine (line_management=<left value>|<right value>) some values to reflect what actually happen on a given support level according to compatibility rules introduced upside.
This table indicates situations corresponding to left value in rows and right value in columns.
Each line refers to an independent line system (a circuit, for power lines, 3 cables in alternative 3-phases system). Black ones are mandatory and grey ones are optional elements which don't change the value selection if they exist.
All parallels lines are draw with a single OSM way in practice with appropriate cables=* and circuits=* values.
You won't see cross as it can't be combined with any other value for a given level.
Left & right are established following common principles of OSM.
| Value | straight | branch | split | transpose | termination | transition |
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| straight | straight | 
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split | 
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split/transition or simpler split if several transitions |
| branch | 
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branch | 
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| split | split | 
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split | 
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| transpose | 
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transpose | 
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| termination | 
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termination | 
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| transition | split/transition or simpler split if several transitions |
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transition |
Real life chart
Finally, let's illustrate this proposal with a concrete use case summarizing many individual possibilities.
Further thinking is required to address complex situations, as line management can mix several configurations on different tower levels.
Once a little more work will be done on Matrix_values, proposed values for line_management=* could be used together to better reflect situations occurring on the same tower/pole support node.
Furthermore, it is not mandatory to use this tag on any particular support node. Use this key only when you are sure that the value is suitable for the situation you found.
You'll find below a chart illustrating what you should see on ground and how to use corresponding line management values.
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Termination pole power=pole line_attachment=anchor line_management=termination line_arrangement=horizontal |
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Branch pole power=pole line_attachment=anchor line_management=branch line_arrangement=semi_vertical Y connection then it's a branch. |
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Split pole power=pole line_attachment=anchor line_management=split line_arrangement=semi_vertical |
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Branch pole power=pole line_attachment=(pin)|(anchor) line_management=branch No arrangement for now as several are mixed on this support |
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Cross pole power=pole line_attachment=(pin)|(anchor) line_management=cross No arrangement for now as several are mixed on this support |
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Transposition tower power=tower line_attachment=anchor line_management=transpose line_arrangement=horizontal |
See also
- line_attachment=* - Consistently defining how a power, telecom or even washing line is attached to its supports
- Diary: Improving power tower/poles mapping without tower:type