[Qgis-user] mapping bus routes

[Sam S]

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.gitlab at 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.neumann at 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.gitlab at gmail.com>
> <njacadieux.gitlab at gmail.com> a écrit :
>
> Oups!  Forgot the list...
>
> Nicolas Cadieux
> https://gitlab.com/njacadieux
>
> Le 7 oct. 2021 à 17:23, Nicolas Cadieux <njacadieux.gitlab at gmail.com>
> <njacadieux.gitlab at 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 <hghklly at gmail.com>
> <hghklly at 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
>
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