[Talk-ca] Hydro network mappings

[Steve Singer]

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?


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