[Qgis-user] mapping bus routes

[Andreas Neumann]

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> 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> 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> 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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