<div dir="ltr"><div dir="ltr"></div><div>Hi Joseph,</div><div><br></div><div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le mar. 4 juin 2019 à 01:55, Joseph Eisenberg <<a href="mailto:joseph.eisenberg@gmail.com">joseph.eisenberg@gmail.com</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
However, the key "usage=" is also used with railways, eg usage=main,<br>
usage=branch. This might be considered a problem by some mappers,<br>
though at least all of the values used for railways are completely<br>
different than the list of values used for waterways and pipelines.<br></blockquote><div><br></div><div>To me it's not an issue but someone can indeed have different opinion.<br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
The other issue is that canals or ditches used for both irrigation and<br>
drainage (depending on the season) would need to be tagged like<br>
"usage=irrigation;drainage", and a long-distance canal that transmits<br>
irrigation water might need to be tagged<br>
"usage=transmission;irrigation"<br></blockquote><div><br></div><div>According to semantics of canals and ditches, a canal can't be used for drainage and a ditch/drain shouldn't be used for irrigation</div><div><br></div><div>Transmission should overcome any other value as it consists in leading water from source to consumption places for more precise purpose.</div><div>We do have same approach with power lines or highway</div><div>You won't tag an actual motorway highway=motorway;service;residential for the reason it leads to residential or service highways at its end.<br></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
2) Irrigation=yes<br>
<br>
With this tag, it would be possible to also use "drainage=yes", so a<br>
canal used for both drainage and irrigation could be "waterway=canal"<br>
+ "irrigation=yes" + "drainage=yes" - this leads to using an extra<br>
tag, but doesn't require any semicolon-separated values.<br></blockquote><div><br></div><div>This shouldn't occur according to my comment upside.</div>usage values should not intersect with each others, I think there is no need of yes/no values for it.</div><div class="gmail_quote"><br></div><div class="gmail_quote">Feel free to give any example where it doesn't work.<br></div><div class="gmail_quote"><br></div><div class="gmail_quote">All the best<br></div><div class="gmail_quote"><div><br></div><div>François<br></div><div><br></div></div></div></div>