[Tagging] Waterway direction

Nathan Edgars II neroute2 at gmail.com
Tue Aug 31 17:53:25 BST 2010

On Tue, Aug 31, 2010 at 12:34 PM, Pieren <pieren3 at gmail.com> wrote:
> On Tue, Aug 31, 2010 at 6:27 PM, Nathan Edgars II <neroute2 at gmail.com>
> wrote:
>>Someone else wrote but Pieren removed the attribution:
>> > BTW if you add oneway=yes tag, it renders nicely on mapnik.   As an
>> > example,
>> > converted Canadian NHN streams have oneway=yes.
>> Yeah - what started this thread was someone objecting to my use of
>> oneway=yes on a waterway :)
> Yes and the direction defined by the OSM way is a very old definition on the
> wiki and a large consensus since years. Adding a oneway tag to solve a
> Mapnik issue is what you know.

Adding a oneway tag explicitly says that it flows that way. If there's
no oneway tag it may have been mapped without regard for or knowledge
of the direction. It also makes it possible to see errors - how are
you going to get enough eyeballs if none of those eyeballs can see
which way the waterways are tagged?

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