[Tagging] Non Proposed Features

John F. Eldredge john at jfeldredge.com
Mon Aug 30 23:36:23 BST 2010

On 08/30/2010 03:35 PM, Pierre-Alain Dorange wrote:
> Nathan Edgars II <neroute2 at gmail.com>
> wrote:
>>> That's true, but IMHO the "wrong" way is tagged there: the culvert
>>> should go on the waterway, i.e. where it is.
>> What do you mean by "where it is"? The culvert is the structure that
>> carries the road over the waterway.
> I'm not sure i have understand, but (for me) a culvert can't "carries a
> road over" ; a culvert is a kind of tube that goes under a structure to
> allow water to go throught a roadrail...
> Wikipedia for example tell :
> "A culvert is a device used to channel water. It may be used to allow
> water to pass underneath a road, railway, or embankment for example.
> Culverts can be made of many different materials; steel, polyvinyl
> chloride (PVC) and concrete are the most common."
> <http://en.wikipedia.org/wiki/Culvert>
> What you describ "a structure that carry the road over" is a bridge for
> me.
>>> I also saw another strange thing there: your waterways are tagged
>>> oneway=yes. What does that mean? Is this for boat-traffic? Do the
>>> boats pass the culvert? According to the wiki oneway is used for
>>> access-restrictions, i.e. it is a legal tag, not a physical one.
>> How else would you tag water flow?
> Water flow is the way direction (the direction it has been drawn, if
> opposite, reverse the way).
> oneway=yes do not indicate any direction just that there is only one
> direction possible, the direction is indicate by the direction of the
> original drawing.
> <http://wiki.openstreetmap.org/wiki/Tag:waterway%3Driver>
> "Direction of the way should be downstream."
> oneway tag is design to indicat access restriction.
> <http://wiki.openstreetmap.org/wiki/Oneway>
Does "direction of the original drawing" mean that the nodes should be
marked from upstream to downstream?  If not, how do you specify the
direction of a waterway when mapping it?  Also, how do you reverse a
way?  The wiki page for the direction key only gives the examples of
clockwise vs. counterclockwise for a round-about, and up/down for steps.

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