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 <[email protected]> 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 <[email protected]> a >>>> écrit : >>>> >>>> Oups! Forgot the list... >>>> >>>> Nicolas Cadieux >>>> https://gitlab.com/njacadieux >>>> >>>>> Le 7 oct. 2021 à 17:23, Nicolas Cadieux <[email protected]> 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 <[email protected]> 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 >>>>>> [email protected] >>>>>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user >>>>>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >>> >>> >>> _______________________________________________ >>> Qgis-user mailing list >>> [email protected] >>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user >>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >> >> >> >> _______________________________________________ >> Qgis-user mailing list >> [email protected] >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >
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