(Sorry Rory, resent this to Talk ML) 2018-02-23 11:35 GMT+01:00 Rory McCann <[email protected]>:
> On 23/02/18 06:53, Maarten Deen wrote: > >> 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. >> > > But then how far do you go? Should every stream be connected to the > central river? e.g. what about here ( http://tools.geofabrik.de/osmi > /?view=water&lon=28.57869&lat=-16.75136&zoom=11 )? > Yes: http://tools.geofabrik.de/osmi/?view=water&lon=28.57869&; lat=-16.75136&zoom=11 > If some rivers/streams shouldn't be connected, then some data consumers > will have to do an automatic connection anyway. When measuring water run > off and pollution, you probably want to know that "stuff going into > stream X will eventually get to point Y downstream" (right?). > I don't get this, which situation do you think of when you say " If some rivers/streams shouldn't be connected " ? > Connecting all means that large lakes will be full of a "skeleton" of > joining rivers/streams, and a small 1km stream could get a lot longer. Yes they do http://tools.geofabrik.de/osmi/?view=water&lon=28.57869&; lat=-16.75136&zoom=11 This can be solved by removing waterways sections which intersect with lakes water body. It could be done on consumer purpose for a particular usage. Topology is also a really useful data and waterways should definetly connect downstream sections. 2018-02-23 11:45 GMT+01:00 Joseph Reeves <[email protected]>: > 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? > You can achieve this with OSRM with a proper routing profile, or even pg-routing if you are at ease with it. All the best François
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