[Talk-ca] Hydro network mappings

[Colin McGregor]

On 12/2/08, Steve Singer <ssinger_pg at sympatico.ca> wrote:
> I think I now have enough content at
> http://wiki.openstreetmap.org/wiki/Geobase_NHN_-_OSM_Map_Feature for some
> other eyes to look at it.
>
> I've described the major hydro network entities that I think we are
> interested in.  I've also taken a stab at some attribute mappings but I
> could use some help with coming up with the appropriate OSM attributes for
> many things.
>
> I also think we need to think about/discuss how/if we want to model
>
> Water flow direction
> ---------------------
> The Geobase 'Network Linear Flow' entities describe the direction water
> flows in. We need to decide if this is worth importing into OSM and how. The
> wiki page for Key:waterway recommends that the ways point downstream, but
> the wiki page is unclear how waterway would be applied to an area.
>
> Do we try to extract waterflow and apply it to the direction? Do we create a
> separate 'flow' way like geobase does? Or do we ignore waterflow direction?

Well, I know there has been concern expressed re: doing nautical chart
level mapping (i.e.: who is liable if a mega-$$ yacht runs aground due
to bad chart/map data). On the other hand I can see value to the likes
of kayakers in noting stream direction, at least where there is a
consistant stream direction (in some tidal areas water flow directions
can get ... strange).

> Junctions
> -----------
>
> The geobase data has entities called 'hydro junctions' that describe how two
> features are joined. How do we want to model this in OSM?
>
>
> Steve