[Tagging] waterway=wadi problem

Mateusz Konieczny matkoniecz at gmail.com
Wed Jan 14 20:59:49 UTC 2015


"It would be nice if the default rendering at www.openstreetmap.org would
also recognize the intermittent tag."

Implementing that I mentioned in top post is for default style - see
https://github.com/gravitystorm/openstreetmap-carto/pull/1000

2015-01-14 18:00 GMT+01:00 Tod Fitch <tod at fitchdesign.com>:

> On Jan 14, 2015, at 8:28 AM, Wolfgang Zenker wrote:
>
> > * Mateusz Konieczny <matkoniecz at gmail.com> [150114 15:45]:
> >> waterway=wadi is used (18 180 times) and has some support (for example
> JOSM
> >> and default map style).
> >
> >> During implementing rendering of intermittent=yes I discovered major
> >> problem with this tag -
> >> the same waterway=wadi may be used for completely dried up waterway,
> >> intermittent stream, intermittent major river and intermittent ditch.
> >
> >> Therefore - it seems that using waterway=river/canal/stream/ditch/drain
> +
> >> intermittent=yes is clearly superior to using waterway=wadi.
> >
> > In my experience a wadi will go from "completely dried up waterway" or
> > "small stream" to a raging river within a few seconds after some
> > rainfall upstream, and back to its former self within a few hours.
> > Depending on the location, these rainfall events might very well be
> > a few years apart. When I tag an "intermittent stream" I usually
> > have something more benign in mind, like a stream that only exists
> > during the spring snow melt and is dry the rest of the year, but
> > maybe that is only my interpretation of an intermittent stream.
> >
> > Wolfgang
> >
> Your description of wadi matches many things locally called a "wash" in
> the U.S. desert southwest. Yet when I suggested that I tag those as wadi I
> was shot down. :)
>
> I've taken to tagging them as waterway=river/stream (depending on width)
> and intermittent=yes. And, yes, in these cases "intermittent" may mean that
> it only carries water for an hour or two every couple of years.
>
> The United States Geological Survey (USGS) topographic maps will show them
> as either a line of sand or an intermittent waterway depending, I think, on
> whim of the cartographer.
>
> A while back I submitted a change to the rendering for OsmAnd to recognize
> intermittent=yes as without that desert areas look way to wet. For the
> paper maps that I generate I've also created a Mapnik style that recognizes
> intermittent=yes and uses the USGS style intermittent rendering. It would
> be nice if the default rendering at www.openstreetmap.org would also
> recognize the intermittent tag.
>
>
>
>
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