Before doing the actual routing, the polygon for the "whole lake" must be preprocessed in various ways: eliminate areas which are too shallow, prohibited, one-way/wrong-way, subject to traffic controls etc. Then the routing algorithm can avoid all these no-go areas, just as if they were physical obstacles. There is probably an equivalent of "access=private", "access=permissive" and "access=destination" as well.
--colin On 2015-07-28 16:03, John Eldredge wrote: > In some cases, the navigation path may be different from the named waterway, > such as when locks and canals are used to bypass waterfalls or rapids. In > the case of reservoirs and lakes, some areas may be too shallow for > navigation, so the actual navigation route may not always be the shortest > path between the inlet and outlet points. > > -- > John F. Eldredge -- [email protected] > "Darkness cannot drive out darkness; only light can do that. Hate cannot > drive out hate; only love can do that." -- Martin Luther King, Jr. > > On July 27, 2015 2:25:54 PM Jochen Topf <[email protected]> wrote: > > On Mo, Jul 27, 2015 at 08:08:22 +0100, Lester Caine wrote: On 27/07/15 19:56, > Christoph Hormann wrote: In the case where a stream flows into a reservoir , > and then a stream (with the same name) also flows out of that reservoir, > should a > linear way be drawn through the reservoir to connect the two streams > (the reservoir is currently represented by its own closed way tagged > natural=water, water=reservoir)? > Yes. Although a height difference between in and out might indicate a weir or other obstruction may well indicate that a route is non-navigable? The outflow from a dam may have the same name, but have no use as a through route? This is more about the water flow than about being navigable by a ship. Jochen -- Jochen Topf [email protected] http://www.jochentopf.com/ +49-351-31778688 _______________________________________________ talk mailing list [email protected] https://lists.openstreetmap.org/listinfo/talk _______________________________________________ talk mailing list [email protected] https://lists.openstreetmap.org/listinfo/talk
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