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.vaney...@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. > 3286&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:mich...@dierick.io] > Verzonden: vrijdag 10 februari 2017 18:20 > Aan: talk-be@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 > > _______________________________________________ > Talk-be mailing list > Talk-be@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-be > > > _______________________________________________ > Talk-be mailing list > Talk-be@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-be > -- Joost Schouppe OpenStreetMap <http://www.openstreetmap.org/user/joost%20schouppe/> | Twitter <https://twitter.com/joostjakob> | LinkedIn <https://www.linkedin.com/pub/joost-schouppe/48/939/603> | Meetup <http://www.meetup.com/OpenStreetMap-Belgium/members/97979802/>
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