[Tagging] Docks - Change to use the natural/water schema?

[Dave F]

On 03/04/2022 22:56, Joseph Eisenberg wrote:
> The problem with waterway=dock is that it is used for several 
> different things, only some of which are normally areas of inland water.

I fail to see how location relates to the dock tag.
"An enclosed area of water for ships and boats within which the height 
of the water can be managed, or a dry dock" applies to water, anywhere.


>
> Recall that natural=water is used for the area of "Any inland body of 
> water" But this is not consistent with how waterway=dock is used:

"inland" is so subjective.

OSM tagging system is based on an object's description/purpose rather 
than location.


>
> 1) many waterway=dock areas are part of the sea,

Many are not:
https://overpass-turbo.eu/s/1hsC

In fact, all are "not part of the sea". They've all been constructed 
"inland"


> because the tag is often used to tag a named part of a harbor, such as 
> a slip or berth or quay, or for marines (normally tagged leisure=marina)

Then those areas have been mis-tagged & should be amended.


> This was not the original intention of use for waterway=dock but it is 
> quite common (for example, see the usage around Venice Italy).

Note how all are "inland", both from the coast *and* man made, cut out 
of land.
https://overpass-turbo.eu/s/1hsD

> Such areas should not get the tag natural=water because they should be 
> outside of the natural=coastline.

Not according to your examples..

> Also many are mapped only as a node because they do not have clearly 
> defined outer limits, but natural=water must be mapped as an area.
>
> 2) ...though they should mostly be re-tagged as man_made=pier

Then why mention them?

>
> 3)  dry docks and floating (dry) docks are tagged with waterway=dock 
> and dock=drydock / floating.

As can water=dock

> A floating dock is certainly not an area of water, is it like a kind 
> of barge or vessel which is used to lift boats or ships out of the 
> water for servicing. And a dry dock appears to be dry land 99% of the 
> time in most cases.

For above hull repairs there's no requirement to drain the water.

> Some could be considered an intermittent water area like an 
> ephemeral lake or a flood control basin, but only if the dry dock is 
> still functional.

So water=dock can use the intermittent tag if desired, but it's hardly 
essential - a dock, by definition,

>
> 4) Tidal docks, which are also confusingly called "floating" docks or 
> harbours in parts of the UK, fit the current definition of "an 
> enclosed area of water for ships and other craft within which the 
> height of the water can be managed" by the use of tidal gates or 
> locks. This could be tagged as natural=water plus a new tag like 
> water=tidal_dock
> 5) The term "dock" is also used for ship or boat yards, which may 
> contain dry docks but also areas of dry land used for shipbuilding, 
> repair and maintenance.

No. They're different entities. A boatyard make contain a dock, but not 
the other way around.

DaveF

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