Just found a better image to illustrate a ditch: http://www.woodrow.org/teachers/esi/2001/CostaRica/palo_verde1/human-altered/images/ditch2.jpg
Tristan 2008/9/1 Tristan Scott <[EMAIL PROTECTED]>: > the Waterway=Drain tag has this description: > A Drain is an artificial waterway used for carrying storm water or > industrial discharge. > > To me, that seems unrelated to the ditches I have in mind: > they don't carry storm water - normally the water table won't move > much in a storm (at least in the UK) and the ditches stay were they > are. They contain natural rainwater or saltwater from the marshes. > Secondly, they don't really drain so much as just sit there - the > fields around stay wet, the water doesn't really move. They're used as > fences as much as somewhere to connect field drains to. > here's a pic that seems to illustrate what i have in mind: > http://web.ncf.ca/bf250/images/odditch.jpg > > It strikes me that tagging as drain loses the information that drains > are usually empty unless draining something (like a storm) and also > tend to be channels for water movement rather than just sort of long > thin ponds, though I suppose we must lose information somewhere to > avoid tag congestion. > Maybe modifying and clarifying the scope of the drain tag would do? > Thoughts? > > Tristan > > 2008/9/1 Andy Robinson (blackadder-lists) <[EMAIL PROTECTED]>: >> Tristan Scott wrote: >>>Sent: 01 September 2008 3:37 PM >>>To: talk@openstreetmap.org >>>Subject: [OSM-talk] [tagging] Feature Proposal - RFC - waterways/ditch >>> >>>This is a request for comments (my first, so let me know if i've done >>>it wrong!) on my waterway/ditch. >>>http://wiki.openstreetmap.org/index.php/Proposed_features/Ditch >>> >>>mainly as there's a large area of marshes around where I live, and the >>>canal waterway tag is completely inappropriate for the still overgrown >>>drainage ditches (too wide to jump, too overgrown and narrow to >>>navigate, and not even remotely canal-like) >>>I can get organised with a picture of the ditch if that's necessary. >>>Note that ditchs are occasionally "slubbed" out, but every ditch i >>>know of is more than 50 years old - so it's not as if they're >>>seasonal. >>> >>>oh, and they're on Ordnance Survey maps as thin blue lines, if that's >>>relevant. >> >> Map Features has always had a waterway=drain tag which was always intended >> for drains and ditches. I've been using that when I come across one. >> >> Cheers >> >> Andy >> >> >> > > > > -- > Tristan Scott BSc(Hons) > Yare Valley Technical Services > 01603 858441 > 07837 205829 > -- Tristan Scott BSc(Hons) Yare Valley Technical Services 01603 858441 07837 205829 _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk