[HOT] Waterway Tags

Russell Deffner russell.deffner at hotosm.org
Thu Jan 22 00:17:10 UTC 2015


I'm no expert in the waterway arena, however I wanted to point out that
there is currently a pretty in-depth discussion of waterway tagging
(including some suggestions to discontinue using waterway=wadi) on the
Tagging mailing list, you can find the thread archive here:

Happy Mapping,

On Wed, Jan 21, 2015 at 4:18 PM, john whelan <jwhelan0112 at gmail.com> wrote:

> I have difficulties with water I must confess.  I'm mapping from a
> satellite image taken an a particular day.  All I see is water, not wadi
> etc.  If its a River I'm supposed to note which direction it flows.  My
> eyesight isn't that good.  A wide river isn't a problem but when is a
> Stream a River or the other way round, or sometimes I see a series of
> elongated patches of water and I'm unclear what those are.
> Unfortunately I think we need people on the ground to better tag what we
> are doing from the satellite image.
> Cheerio John
> On 21 January 2015 at 18:04, AYTOUN RALPH <ralph.aytoun at ntlworld.com>
> wrote:
>> I would like to raise the issue of tags for *waterway=river*,
>> *waterway=stream* and* waterway=wadi.*
>> The problem that exists with the existing tags is that there is no visual
>> difference on the map for a stream (perennial) and a stream (intermittent)
>> and the only other option is wadi which gives a blue pecked line.
>> Accepted mapping standards for this would be to show:-
>>  all perennial rivers and streams as a continuous solid blue line
>> (indicating that there is flowing water all year round)
>>  all non-perennial rivers and streams as a continuous blue pecked line
>> (indicating that there is flowing water during the wet season but not the
>> whole year).
>> A wadi would be depicted with a continuous pecked brown line (indicating
>> that it is dry watercourse and could be dry for years at a time...only
>> flowing if there is a flash flood or unusually heavy rain).
>> This would then convey the correct meanings with symbols on the map and
>> make reading the map a lot easier. The categories would still be searchable
>> and distinguish between the three categories of water flow.
>> The proposed tags would then be
>> *waterway=river* ...... *waterway= stream* ...... continuous solid blue
>> line
>> *waterway=river_intermittent ...... waterway=stream_intermittent ..... *continuous
>> pecked blue line
>> *waterway=wadi* ..... continuous pecked brown line (a wadi can be so
>> wide that another tag would be needed similar to the tag for river banks)
>> *waterway=wadi_bank* which would still be a brown pecked line.
>> This would then ease the path for introducing the tags for perennial
>> lakes with a solid blue outline and lighter blue fill, intermittent lakes
>> with a blue pecked outline and a light blue fill and dry pans with a brown
>> pecked outline with a brown stipple fill.
>> I can figure out a single tag proposal on wiki but do not know how to do
>> this more complex proposal as it entails changing all the tags at the same
>> time along with their map symbols.
>> If it is deemed appropriate is there someone who could do this?
>> Reference......
>> http://pubs.usgs.gov/gip/TopographicMapSymbols/topomapsymbols.pdf
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