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.ayt...@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 > > _______________________________________________ > HOT mailing list > HOT@openstreetmap.org > https://lists.openstreetmap.org/listinfo/hot > >
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