Hi all- Jumping on this thread.
I think it's worth to first distinguish between tagging (attribution - attributes and values) and rendering. Concerning the tagging aspect of the discussion how to describe a waterway used for motorized traffic. I think we have to consider a two ways approach: (i) waterway and (ii) highway to avoid mixing attributes relating to different thematic objects. Waterways allowing for motorized traffic clearly refer to non perenial rivers/ streams and wadi can be a generic term on which to forge a tag, but among other ones. Ideal if a quick inventory of key values used in this realm in established data model could be useful to complete the set of osm tags showing in the MapFeatures which is not taking care of this aspect of hydrogology. I would not tend to include in waterways descriptors relating to ground/ surface motorized traffic. Ground/ surface motorized traffic in river beds of non perenial water bodies should be handled to my mind at the highway level Highway=ford (in map feature) is well suited for this. This tag can be completed easily with the highway practicability tag values (highway_practicability=*) as described in the Humanitarian Data Model (HDM)- Highways/ roads<http://wiki.openstreetmap.org/wiki/Humanitarian_OSM_Tags/Humanitarian_Data_Model#Highway.2F_Road> I also think that a tag about seasonality could complement this (highway:seasonality=yes/no). Both practicability and Seasonality are attributes relating to ground/ surrface - road transportation traffic in the UN Spatial Data Infrastructure for Transport<http://www.unjlc.org/tools/UNSDI-T/UNSDIT_v2.0_Comprehensive_Structure_HTML.html>a strong established humanitarian data model used in humanitarian logistics Note that the ford value can also be used as a crossing point see HDM - Obstacles<http://wiki.openstreetmap.org/wiki/Humanitarian_OSM_Tags/Humanitarian_Data_Model#Obstacle> . I hope this helps Happy to further discuss with you all Best N On Sun, Feb 14, 2010 at 8:38 PM, Hans van Wijk <hvw...@wxs.nl> wrote: > John wrote: > > I am not proposing having two ways in the same space anymore > > as I see the logic presented but a new type of (single) way > > that would have attributes for both. > > > > Perhaps for the stretch where they join, could there be a > > combined 'road/stream' type of way that could provide > > continuity for both? > > Yes it should be something like that. > > > The designation would actually switch seasonally. > > The renderers should take the seasonal habbits of the location into > account, > but having a set of country specific properties for renderers is a whole > other discussion, which, I believe, is held on many occasions before. > > > > From: "Hans van Wijk" Sent: Sunday, February 14, 2010 12:24 PM > > > We could benefit from some tag that identifies a river that > > dries out > > > during dry season and I believe 'wadi' is a good candidate. I saw a > > > 'wadibank' > > > already somewhere, which also makes for a good waterway > > value when it > > > concerns a closed way. See also wiki: > > > http://en.wikipedia.org/wiki/Wadi > > > > > > > > > John wrote: > > >> I do not see why we cannot have two traces in the same > > place (or with > > >> a small offset). Hopefully we will be able to identify the > > entrance > > >> and exit of the 'roadway'. I am sure that these 'roadways' would be > > > seasonal. > > >> > > >> Sometimes hiking trails (my expertise) will follow a > > streambed for a > > >> while and for the sake of continuity, this is how it is handled. > > > > > > > > > Sure this makes for a solution, but I can't shake the feeling that > > > it's wrong as long as they aren't two separate ways. > > > _______________________________________________ > Talk-ht mailing list > Talk-ht@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-ht > -- Nicolas Chavent Humanitarian OpenStreetMap Team http://wiki.openstreetmap.org/wiki/WikiProject_Haiti Mobile (FRA): +33 6 75 14 29 70 Email: nicolas.chav...@gmail.com Skype: c_nicolas
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