I built a number of bus maps in the past and kept everything inside QGIS using offsets in symbology. It worked because it was a simple dataset where the number of routes sharing paths was very minimal, so I just styled each 'unique' segment individually. I also did not have a problem with aligning with the street pattern below (David's noted issue) because I styled the routes larger than the street symbology so any 'incorrect' alignment between the routes and the streets was hidden by the larger route symbology on top.
With a more complicated set of routes I would have probably graduated to a workflow that included a graphics application as the final step to make manual tweaks. At a certain point of complexity/geographic size most transit maps stop being truly scalable and become more abstract. A good example of the debate is NYC's vignelli vs hertz. However, most transit maps (in terms of 'quantity of maps') are for small operators where scale can be maintained - so any automated tool might not 'work' for very large not-to-scale systems but would be the most useful to those with the fewest resources (small systems). Anyways, tough problem. Sam On Fri, Oct 8, 2021 at 7:48 AM Nicolas Cadieux <njacadieux.git...@gmail.com> wrote: > Hi, > > Maybe Anita Graser has something on the topic? https://anitagraser.com/ She > does a lot of work in visualization mass transportation. Yes, looking at > line azimut by color was the way I did it in the past. It’s still a good > way when the network has a lot of snapping errors. My algorithm with > permit you find those problems. If you see a network problem my algorithm > does not find, please tell me and I could work them in. > > Nicolas Cadieux > https://gitlab.com/njacadieux > > Le 8 oct. 2021 à 02:54, Andreas Neumann <a.neum...@carto.net> a écrit : > > > > Hi, > > Besides on what was discussed here on the list already, I can add the > following information: the Swiss QGIS user group has mandated Nyall Dawson > to carry out a couple of days of research exactly on this topic - kind of a > feasibility study if it would be possible to draw such network maps "on the > fly" / automatically - with transit maps and hiking maps (multiple parallel > hiking routes) in mind. > > I believe Nyall will work on this before the end of the year. > > Of course we cannot promise anything - but based on the outcome of this > study, there might be follow-up work pending. If there is interest from > other users we might want to organize an institutional crowd funding > initiative. > > This won't help you immediately - but it might be good for you to know > that the problem is on the radar. If there is a positive outcome in the > study, there might be implementation work pending next year. > > Greetings, > > Andreas > > On 2021-10-07 23:53, David Strip wrote: > > For a transit map, it seems the offset would not be constant. Consider two > bus routes that overlap along a single street in their routes. On that > street, the two lines typically would be offset to opposite sides of the > line representing the street. On the rest of the route, however, the route > would be shown as lying directly over the centerline, not offset to either > side. Life gets even more complicated when multiple routes overlap with > different numbers of other routes at various points on the map. Or at > least that's what I've typically seen on transit maps. > > On 10/7/2021 3:30 PM, Nicolas Cadieux wrote: > > Hi, > You can also trim the lines in the symbology (at least in QGIS 3.20) as > well as giving it an offset. That will insure that intersection are not > overlapping in the offset. > > Nicolas Cadieux > https://gitlab.com/njacadieux > > Le 7 oct. 2021 à 17:23, Nicolas Cadieux <njacadieux.git...@gmail.com> > <njacadieux.git...@gmail.com> a écrit : > > Oups! Forgot the list... > > Nicolas Cadieux > https://gitlab.com/njacadieux > > Le 7 oct. 2021 à 17:23, Nicolas Cadieux <njacadieux.git...@gmail.com> > <njacadieux.git...@gmail.com> a écrit : > > Hi, > You can automatically draw an offset by adding a offset in the symbology. > Things get more complicated when line vectorization changes directions as > the offset flips side depending on, for example, if the line is drawn from > A to B or B to A. > > In the QGIS models, https://plugins.qgis.org/, go to models then Fix > Directional Network models 1,2 and 3. That will help you find problems > (like disconnected lines) but also identify all the lines that are flipped. > You can then flip them manually or figure out an algorithm to do it > automatically. > > You will also find a boring YouTube video on my YouTube channel. > https://youtu.be/v61PafSByvM > > Nicolas Cadieux > https://gitlab.com/njacadieux > > Le 7 oct. 2021 à 14:17, Hugh Kelley <hghk...@gmail.com> > <hghk...@gmail.com> a écrit : > > Hi all, > > I'm wondering if anyone has any good tricks for mapping bus routes. The > key problem is defining how to offset lines where the routes overlap. > > I've handled this by chopping up the lines and offsetting in postgis > according to some st_dwithins and st_intersections but wanted to see if > there is anything in the wide world of QGIS that I'm not aware of. > > My understanding is that it's a fairly significant challenge to do a great > job with it. A company called transitapp had an interesting blog post about > it a while ago. > https://archive.transitapp.com/transit-maps-apple-vs-google-vs-us-cb3d7cd2c362#.e9kcryzg1 > > > Hugh > > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > > _______________________________________________ > Qgis-user mailing listqgis-u...@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > > > > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >
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