[Tagging] Feature proposal - RFC - Overhead lines management (consecutive to line_attachment)

[François Lacombe]

Hi all,

After the review of line_attachment key this summer and Karlsruhe
hackweekend at Geofabrik headquarters last week, let me introduce the
second stage of tower:type key cleaning project for power lines. Great time
has been spent on discussing and finding relevant situations.
https://wiki.openstreetmap.org/wiki/Proposed_features/Lines_management

It's now about the arrangement of power lines around their supports: how
the lines branch, split, transpose or terminate.
As current tagging (without line_management) still collides with any tower
building function, the line_management key may be a solution to strip
unrelated values from tower:type.

I've published a diary entry to give more explanations
https://www.openstreetmap.org/user/InfosReseaux/diary/391058

I'd draw your attention to the conclusion :
"Mapping utility supports like power towers or telecom poles is a worldwide
challenge. For instance in France, professionals including operators and
contractors rolling out overhead telecom cables are currently looking for
approx. 16 millions missing shared power poles that weren’t mapped in
operational GIS. There’s no doubt updating OSM can help."
There's no short term risk of importing massive data, at least.

This proposal is a first try and may cause worries about some local
concerns. RFC is here to solve this prior to vote anything.
We have to focus on simple situations to begin with to adopt the right
semantic. More complex cases will be added step by step.
Feel free to open a topic in Talk page.

All the best

François
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