Tag:location:transition=yes

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Public-images-osm logo.svg location:transition = yes
French distribution line with transition.jpg
Description
Places where a the location of a long linear feature changes
Used on these elements
may be used on nodesshould not be used on waysshould not be used on areasshould not be used on relations
Status: ApprovedPage for proposal

Many features can be described with location=* on OSM as for indicating where those features can be seen.
The location of long linear infrastructures like power=cables, man_made=pipelines and even highway=motorways can change sometimes.

It is possible to use the location:transition=* on nodes where location changes occur.

At such places, several OSM features with different locations are connected to each other.
location:transition=* can enable mappers to indicate the location is changing without describing all features involved (mainly for verifiability/visibility reasons)
Currently, location transitions can be gathered by location=* values comparison on two or more connected map features (often ways). Sometimes, underground part can't be mapped due to lack of information (or verifiability principle violation) and the transition isn't complete. This key is intended for such cases.
It is certainly more sustainable than using fixme=continue or other temporarily stuff both regarding data consumers and other mappers.

Tagging

Tagging is really simple : just add location:transition=yes on the node connecting two or more features with different locations.
In case of one side can't be mapped due to its non-verifiable location, just add location:transition=* at the end of features linked to the transition.

yes is currently the only documented value, but a few more can obviously be added for special needs.

  • Requests may be mainly interested to check if location:transition=* exists on features without focusing on any particular value.
  • location=transition shouldn't be used since transition isn't a proper location for features.


Equivalent values

Here are the keys or values which mean the same as location:transition=yes, on power features only. They can be left on features or replaced depending on mappers needs and views.
The proposed key os more global and apply to many more cases than the ones below.

Specialized value Used for ? More global tag to use Taginfo usage as of 22nd December 2015
tower=air_to_ground A transition between overhead power line and underground cable location:transition=yes 516
tower=location_transition A transition between overhead power line and underground cable location:transition=yes 23
tower=transition A transition between overhead power line and underground cable location:transition=yes 1305
pole=location_transition A transition between overhead power line and underground cable location:transition=yes 264
pole=transition A transition between overhead power line and underground cable location:transition=yes 3546

Examples

As you way understand by reading the introduction, this key is mainly designed for industrial networks, power or pipelines.
Nevertheless, location:transition=* is a far more global key and should be used in any field of knowledge, depending on opportunities.
Feel free to complete this examples section.

Power

  • A line goes underground
French distribution line with transition.jpg

Node On the pole itself :


Way On the overhead power line


Way On the (eventually mapped) underground cable

-
Sindelfingen Gesockelter Mast 2007 by-RaBoe 03.jpg

Node On the tower itself :


Way On the overhead power line


Way On the (eventually mapped) underground cable


Pipelines

  • A pipeline goes underground
Pipeline outdoor substation.jpg

Node On the precise place where the pipeline goes underground :


Way On the overground pipe :


Way On the (eventually mapped) undergound pipe :

Telecom


Those successive parts underground/undersea/underground only exists because ships can't tow burying machines to the ground as shown on the example picture.

Atterrissement.jpg

Node On the precise place where the cable goes from underground to the sea :


Node On the precise place where the cable goes from the sea to under the sea floor (offshore) :


Way On the (eventually mapped) undersea cable :


Way On both of the underground land and oceanic part of the cable :