On 14-Feb-18 11:05 AM, marc marc wrote:
Le 14. 02. 18 à 00:51, Warin a écrit :
OSM unfortunately 'maps what is there' .. not "hardware"/"use".
a water flow is there -> waterway=* (the same logic as for highway=*)
we already map "hardware" for road (surface) for building
(building:material). did we need to delete those ?


No 'we' did not delete them .. but they are secondary tags.. 'we' map the 
road/building first then things like colour, surface, hight, elevation etc etc.
The 'primary' thing 'we' tag is what is there ..
When there is a pipe .. I map a pipe.
I may not know what is inside the pipe.
I may not know what the function of the pipe is.
But I map the pipe.



In the diagram
https://wiki.openstreetmap.org/w/images/thumb/e/e6/Waterway_flows.png/500px-Waterway_flows.png
The upper ones may well be man made - so the tags waterway=canal,
tunnel=yes could be replace by
man_made=pipeline ..
1) a tunnel is not a pipeline !

Some are. Some are constructed to be used to transport water.

2) not having a waterway=* is bad beaucase it break the continuity of
the water network.
By analogy, when a trunk go into a tunnel,
we don't replace highway=trunk by tunnel=trunk
but we keep a continuity of highway=* network by having on tag
for "road network" and another tag for the tunnel it-self.

Tagging for navigation? Or water flow? Is this not a render issue?

A pipeline carrying water is now to be re-tagged as a waterway? Because the 
'waterway network' cannot tolerate it?

I think man_made=pipeline is a valid truthful tag. I have used it for hydro 
power water supply. And will continue to do so.





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