Power validation rules update

[francois.lacombe]

Hi,

Due to recently power presets update, this ticket aims to provide updated guidelines regarding the validation of user inputs with these keys.
This comes after some objects have been broken by non-knowledgable users (substation on open poly-line, power terminal in the middle of a power way and so on...)

Here are the valid features associated with the main power keys, got from the up to date wiki

Tag (wiki)	Valid features	Preset	object type validator rule
​Tag:power=plant	area, relation	✔	✔
​Tag:power=generator	node, area	✔	not needed
​Tag:power=cable	way	✔	not needed
​Tag:power=line	way	✔	✔ Done.
​Tag:power=minor_line	way	✔	not needed
​Tag:power=tower	node	✔	✔ Done.(for unclosed ways only)
​Tag:power=pole	node	✔	✔
​Tag:power=terminal	node	Not in Preset, see #12297	-
​Tag:power=portal	node, way	✔	not needed
​Tag:power=insulator	node, way	✔	not needed
​Tag:power=catenary_mast	node	Not in Preset, see #12297	-
​Tag:power=transformer	node	✔ Done.	✔ Done.
​Tag:power=switch or ​Tag:power=pole+switch=yes or ​Tag:power=tower+switch=yes	node	✔	not needed
​Tag:power=substation	node, area	✔	not needed (area style not closed warning for unclosed ways already there)
​Tag:power=converter	node, area	✔	not needed (area style not closed warning for unclosed ways already there)
​Tag:power=compensator	node, area	✔	not needed (area style not closed warning for unclosed ways already there)
​Tag:power=insulator	node, way	✔ Done.	not needed
​Tag:building=transformer_tower	node, area	✔	not needed (area style not closed warning for unclosed ways already there)

Presets may be updated according to this table and I suggest to prompt a validation warning when such keys are used on different features than the given ones.

It may be great to update current validation rules :

Rule	Update
A power support is missing on a power line/power minor_line	Add ​Tag:power=portal, ​Tag:power=terminal, ​Tag:power=insulator as valid supports. Furthermore, a power line/minor_line can be directly connected to a ​Tag:power=transformer.

And add a few more :

Rule	Description	Progress
A ​Tag:power=cable without ​Key:location	A power cable is a feature which must be set in a dedicated location such as indoor, underground or undersea (non exhaustive list). Any power cable object without the location key may show up a validation warning.	✔ Done. Wiki says that location=* is optional and that underground is the assumed default value for power=cable. However 5290 out of 7963 cables have the location tag (​http://overpass-turbo.eu/s/dMQ). So add this as info level.
Crossing between road, railroad, path, landuse, waterways and power ways	Power lines may be long objects crossing through country and mappers can easily place nodes in common with roads or landuse areas. A validation error should be prompted to reduce the amount of such problems.
Missing voltage as important information	Adding ​Key:voltage to ​Tag:power=line, ​Tag:power=minor_line, ​Tag:power=cable, ​Tag:power=generator, ​Tag:power=transformer or ​Tag:power=plant is a really useful information and miss this key should prompt an info validation message. Voltage is currently one main threshold to distinguish line from minor_line.	✔ Done.

These lists can be improved according to the experience of contributors and developers

[Klumbumbus]

In 9494/josm:

see #12386 - allow power=insulator on ways in preset; add validator warnings for power=tower on unclosed way and power=line on node

[Klumbumbus]

We don't need validator rules for cases, which are nearly non existent in the database. This would only extend the validation time without a gain.

[Klumbumbus]

In 9495/josm:

see #12386 - add validator info for power=cable without location

[francois.lacombe]

Thank you Klumbumbus for the edits so far

Regarding power=transformer on ways/areas : mappers really shouldn't use this.
​http://wiki.openstreetmap.org/wiki/Tag:power%3Dtransformer

The 8944 instances will slowly be converted to node (sometimes in the middle of a building=* object)
Example : ​https://www.openstreetmap.org/node/3342939725
That's why a validation info or warning may really be welcome to help to down transformers as a way to 0.

[Klumbumbus]

In 9500/josm:

see #12386 - remove support of power=transformer on ways and add validator warning. add validator info for some power features without voltage, adjust presets, integrate separate power.mapcss in combinations.mapcss

[Klumbumbus]

Replying to francois.lacombe:

Thank you Klumbumbus for the edits so far

Regarding power=transformer on ways/areas : mappers really shouldn't use this.
​http://wiki.openstreetmap.org/wiki/Tag:power%3Dtransformer

The 8944 instances will slowly be converted to node (sometimes in the middle of a building=* object)
Example : ​https://www.openstreetmap.org/node/3342939725
That's why a validation info or warning may really be welcome to help to down transformers as a way to 0.

OK, done.

---

I limited the missing voltage info to plants/generators with generator:output:electricity/plant:output:electricity