[OSM-talk-be] Docks (Antwerp port)

[joost schouppe]

OK, so now I actually read it:

According to wikipedia a floating or impounded dock is a dock isolated from
changing tides through locks.

dock=floating is used for floating dry docks (something completely
different)

dock=tidal is used for what wikipedia describes as an impounded dock

The second one is a bit strange, as I would think that implies dock=tidal
equals "a dock that is not tidal" :)

That raises the question: how do you tag a dock that is in fact affected by
tides? I did not seem to find a tag for that, did you guys?

2017-02-24 8:30 GMT+01:00 joost schouppe <joost.schouppe at gmail.com>:

> I'll pass the issue with definition of tidal vs floating on to the tagging
> mailing list to see if there is some strange logic behind it we're missing;
> and report back here.
>
> 2017-02-24 0:12 GMT+01:00 Vincent Van Eyken <vincent.vaneyken at gmail.com>:
>
>> Indeed many (most) docks in the Port of Antwerp are tagged twice / are
>> represented by 2 entities in OSM: once as an area (with waterway=dock) and
>> once as a linear way (waterway=canal). And I admit to be partly responsible
>> for tagging those docks like that.
>>
>> Here is my take on the reason behind that scheme:
>> - those docks are relatively large bodies of water, hence the requirement
>> for the area to be mapped, with the according waterway=dock tag.
>> - but they are also used as navigable waterways, similar to highways, and
>> therefore (also) need a linear element, running along their centre
>> line/thalweg, to easily enable (logical) route calculation; e.g. brouter
>> already provides route calculation along waterway lines [1]
>> As a linear element, their function is imho more like that of a canal,
>> hence the waterway=canal. Of course, this especially makes sense for an
>> actual "Kanaaldok", but it might be disputable for a dock with only 1
>> entry/exit (like a "cul-de-sac")
>>
>> So basically it is very similar to the tagging scheme for (large) natural
>> rivers[2]: a linear, navigable way (waterway=river), combined with one or
>> more closed areas (waterway=riverbank), or the "street/highway area" scheme
>> for very detailed mapping of roads.
>>
>> The messy rendering is of course a result of the fact that both line and
>> area carry the same name, but I suppose that in itself is not a valid
>> reason for change.
>>
>> As to the types of docks on the wiki: certainly the description for
>> dock=tidal does seem counterintuitive or even wrong... not sure what to
>> make of it...
>>
>>
>> [1] http://brouter.de/brouter-web/#zoom=12&lat=51.3012&lon=4.328
>> 6&layer=OpenStreetMap&lonlats=4.277115,51.346912|4.412899,
>> 51.254556&nogos=&profile=river&alternativeidx=0&format=geojson
>> [2] http://wiki.openstreetmap.org/wiki/Rivers
>>
>>
>>
>> -----Oorspronkelijk bericht-----
>> Van: Michaël Dierick [mailto:michael at dierick.io]
>> Verzonden: vrijdag 10 februari 2017 18:20
>> Aan: talk-be at openstreetmap.org
>> Onderwerp: [OSM-talk-be] Docks (Antwerp port)
>>
>> Hi,
>>
>> While looking around on the map at the port of Antwerp I noticed some
>> docks are tagged as a waterway=dock as well as canals (waterway=canal)
>> which results in a somewhat messy rendering ... any ideas on this? (do
>> docks need to be tagged as canal as well)?
>> (https://www.openstreetmap.org/#map=15/51.2551/4.3808)
>>
>> Further when looking at the wiki the definitions of dock=tidal and
>> dock=floating seem somewhat mixed up (see wikipedia @
>> https://en.wikipedia.org/wiki/Floating_dock_(impounded) and
>> https://en.wikipedia.org/wiki/Dock_(maritime)#British_English ) ...
>> could someone confirm this?
>>
>> Thanks,
>>
>> Michaël
>>
>> PS: In maritime environments OSM is used quite a lot (indirectly) through
>> www.marinetraffic.com
>>
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>
>
>
> --
> Joost Schouppe
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>



-- 
Joost Schouppe
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