<div dir="ltr">
<span class="gmail-im">(Sorry Rory, resent this to Talk ML)<br></span><div><span class="gmail-im"><br>2018-02-23 11:35 GMT+01:00 Rory McCann <span dir="ltr"><<a href="mailto:rory@technomancy.org" target="_blank">rory@technomancy.org</a>></span>:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span class="gmail-m_3758992086957715478gmail-">On 23/02/18 06:53, Maarten Deen wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
I see nothing wrong with those examples, I would do it the same,
especially if the rivers can be sailed on by boat. Then you absolutely
need the rivers to be connected to a central river (or fairway) in the
lake.<br>
</blockquote>
<br></span>
But then how far do you go? Should every stream be connected to the<br>
central river? e.g. what about here ( <a href="http://tools.geofabrik.de/osmi/?view=water&lon=28.57869&lat=-16.75136&zoom=11" rel="noreferrer" target="_blank">http://tools.geofabrik.de/osmi<wbr>/?view=water&lon=28.57869&lat=<wbr>-16.75136&zoom=11</a> )?<br></blockquote><div><br></div></span><div>Yes: <a href="http://tools.geofabrik.de/osmi/?view=water&lon=28.57869&lat=-16.75136&zoom=11" target="_blank">http://tools.geofabrik.de/<wbr>osmi/?view=water&lon=28.57869&<wbr>lat=-16.75136&zoom=11</a><br></div><span class="gmail-im"><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
If some rivers/streams shouldn't be connected, then some data consumers<br>
will have to do an automatic connection anyway. When measuring water run<br>
off and pollution, you probably want to know that "stuff going into<br>
stream X will eventually get to point Y downstream" (right?).<br></blockquote><div> </div></span><div>I don't get this, which situation do you think of when you say "
If some rivers/streams shouldn't be connected
" ?<br></div><span class="gmail-im"><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Connecting all means that large lakes will be full of a "skeleton" of<br>
joining rivers/streams, and a small 1km stream could get a lot longer.</blockquote></span><div>Yes they do <a href="http://tools.geofabrik.de/osmi/?view=water&lon=28.57869&lat=-16.75136&zoom=11" target="_blank">http://tools.geofabrik.de/<wbr>osmi/?view=water&lon=28.57869&<wbr>lat=-16.75136&zoom=11</a><br><br></div><div>This can be solved by removing waterways sections which intersect with lakes water body.<br></div><div>It could be done on consumer purpose for a particular usage.<br></div><div>Topology is also a really useful data and waterways should definetly connect downstream sections.<span class="gmail-im"><br><br>
2018-02-23 11:45 GMT+01:00 Joseph Reeves <span dir="ltr"><<a href="mailto:iknowjoseph@gmail.com" target="_blank">iknowjoseph@gmail.com</a>></span>:<br></span><span class="gmail-im"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Slightly
off topic, but I was recently wondering if there was a waterway routing
tool available? As in, I'd like to click a point in a waterway and have
the downstream route plotted, presumably to the sea. It appears to me
that a tool like that could be useful in this discussion?</div></blockquote><div><br></div></span><div>You can achieve this with OSRM with a proper routing profile, or even pg-routing if you are at ease with it. <br><br></div><div>All the best</div></div>
<br></div><div class="gmail_extra">François</div></div>