<div dir="ltr">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.</div><div class="gmail_extra"><br><div class="gmail_quote">2017-02-24 0:12 GMT+01:00 Vincent Van Eyken <span dir="ltr"><<a href="mailto:vincent.vaneyken@gmail.com" target="_blank">vincent.vaneyken@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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.<br>
<br>
Here is my take on the reason behind that scheme:<br>
- those docks are relatively large bodies of water, hence the requirement for the area to be mapped, with the according waterway=dock tag.<br>
- 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]<br>
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")<br>
<br>
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.<br>
<br>
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.<br>
<br>
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...<br>
<br>
<br>
[1] <a href="http://brouter.de/brouter-web/#zoom=12&lat=51.3012&lon=4.3286&layer=OpenStreetMap&lonlats=4.277115,51.346912|4.412899,51.254556&nogos=&profile=river&alternativeidx=0&format=geojson" rel="noreferrer" target="_blank">http://brouter.de/brouter-web/<wbr>#zoom=12&lat=51.3012&lon=4.<wbr>3286&layer=OpenStreetMap&<wbr>lonlats=4.277115,51.346912|4.<wbr>412899,51.254556&nogos=&<wbr>profile=river&alternativeidx=<wbr>0&format=geojson</a><br>
[2] <a href="http://wiki.openstreetmap.org/wiki/Rivers" rel="noreferrer" target="_blank">http://wiki.openstreetmap.org/<wbr>wiki/Rivers</a><br>
<br>
<br>
<br>
-----Oorspronkelijk bericht-----<br>
Van: Michaël Dierick [mailto:<a href="mailto:michael@dierick.io">michael@dierick.io</a>]<br>
Verzonden: vrijdag 10 februari 2017 18:20<br>
Aan: <a href="mailto:talk-be@openstreetmap.org">talk-be@openstreetmap.org</a><br>
Onderwerp: [OSM-talk-be] Docks (Antwerp port)<br>
<div class="HOEnZb"><div class="h5"><br>
Hi,<br>
<br>
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)?<br>
(<a href="https://www.openstreetmap.org/#map=15/51.2551/4.3808" rel="noreferrer" target="_blank">https://www.openstreetmap.<wbr>org/#map=15/51.2551/4.3808</a>)<br>
<br>
Further when looking at the wiki the definitions of dock=tidal and dock=floating seem somewhat mixed up (see wikipedia @<br>
<a href="https://en.wikipedia.org/wiki/Floating_dock_(impounded)" rel="noreferrer" target="_blank">https://en.wikipedia.org/wiki/<wbr>Floating_dock_(impounded)</a> and <a href="https://en.wikipedia.org/wiki/Dock_(maritime)#British_English" rel="noreferrer" target="_blank">https://en.wikipedia.org/wiki/<wbr>Dock_(maritime)#British_<wbr>English</a> ) ...<br>
could someone confirm this?<br>
<br>
Thanks,<br>
<br>
Michaël<br>
<br>
PS: In maritime environments OSM is used quite a lot (indirectly) through <a href="http://www.marinetraffic.com" rel="noreferrer" target="_blank">www.marinetraffic.com</a><br>
<br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">Joost Schouppe</div><div dir="ltr"><a href="http://www.openstreetmap.org/user/joost%20schouppe/" target="_blank">OpenStreetMap</a> | <a href="https://twitter.com/joostjakob" target="_blank">Twitter</a> | <a href="https://www.linkedin.com/pub/joost-schouppe/48/939/603" target="_blank">LinkedIn</a> | <a href="http://www.meetup.com/OpenStreetMap-Belgium/members/97979802/" target="_blank">Meetup</a></div></div></div></div></div></div></div></div>
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