Message: 4
Date: Wed, 30 Jan 2019 13:15:41 +0300
From: Eugene Podshivalov <[email protected]>
To: "Tag discussion, strategy and related tools"
<[email protected]>
Subject: Re: [Tagging] Drain vs ditch
ср, 30 янв. 2019 г. в 13:02, Warin <[email protected]>:
Large means?
Small means?
To me I'd use small = I can step over it, large means I cannot step over
it .. so ~1.1 metres is the line between the two.
Drains and ditches can be 0.1 to 5 metres wide. You can hardly step over a
2-5 metre wide ditch, can you? Anything greater than that can be called a
canal.
So I would leave this up to the user to decide on.
Cheers,
Eugene
ср, 30 янв. 2019 г. в 13:04, Joseph Eisenberg <[email protected]>:
Those descriptions look good
On Wed, Jan 30, 2019 at 5:58 PM Eugene Podshivalov <[email protected]>
wrote:
Here is a summary of the discussion to check if there is a consensus.
Current definitions of artificial waterways are unclear and ambiguous.
Some people assume that ditch and drain differ mainly in size, others
differentiate them mainly on liquid type (can or cannot carry industrial
discharge), others rely on lined or unlined characteristic.
It is suggested to resolve the ambiguities by updating the definitions as
follows.
canal - Large man-made open flow (free flow vs pipe flow) waterways used
to carry useful water for transportation, hydro-power generation,
irrigation or land drainage purposes. Consider using waterway=ditch for
small irrigation or land drainage channels. Consider using waterway=drain
for small usually lined superflous liquid drainage channels.
drain - Small artificial free flow waterways usually lined with concrete
or similar used for carrying away superflous liquid like rain water or
industrial discharge without letting it soak into the ground. Consider
using waterway=ditch for unlined channels used to drain nearby wet land.
Consider using waterway=canal for large unlined land drainage channels.
ditch - Small artificial free flow waterways used for irrigating dry land
or draining wet land. Irrigation ditches can be lined or unlined, drainage
ditches are usually unlined to let water soak through the land into them.
Ditches may have short lined segments at waterway turning points or
intersections with roads or paths to prevent erosion. Consider using
waterway=canal for large irrigation or land drainage channels. Consider
using waterway=drain for usually lined superflous liquid drainage channels.
Cheers,
Eugene
вт, 29 янв. 2019 г. в 18:32, marc marc <[email protected]>:
Le 29.01.19 à 16:13, Eugene Podshivalov a écrit :
How to we proceed with this topic? Should a proposal be created or the
wiki pages can be updated straight away by someone or myself based on
this discussion?
maybe it's a good idea to write a small-summary-only post
to check if there is a consensus on this, because there are probably
many participants who have dropped out given the number of emails that
the subject has generated
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So it sounds like we're using the word "stream" for all natural
waterways smaller than a river. This can mean anything from something
small enough to step across to something several meters across. Is
there no other choice of words that can be used to differentiate these
waterways based on size? Wouldn't it be desirable for renderers to
differentiate "major" and "minor" streams differently? I don't think
relying on a width tag is a good idea, because it's easier for mappers
to simply choose between two words to tag one of these waterways rather
than estimate and assign a width tag.
Mark
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