[Qgis-user] mapping bus routes

Fri Oct 8 01:00:33 PDT 2021

Fascinating topic indeed. You might be interested in the upcoming Schematic Mapping Workshop, see https://www.ruhr-uni-bochum.de/schematicmapping/

If you check out some of the papers produced in that series (and their references), you will discover links to the two "branches" of this field: the artistic/manual and the algorithmic/automation , plus interesting links to HCI and usability research connected to it...

--
Barend Köbben

From: Qgis-user <qgis-user-bounces at lists.osgeo.org> on behalf of Andreas Neumann <a.neumann at carto.net>
Date: Friday, 8 October 2021 at 09:09
To: David Strip <qgis-user at stripfamily.net>
Cc: Qgis List <qgis-user at lists.osgeo.org>
Subject: Re: [Qgis-user] mapping bus routes

and yes - the problem is really not simple, but indeed very challenging.

Most transit maps today are not done in a GIS, but by designers in a graphics applications, like Adobe-Illustrator. The process is usually not automated, but manual.

However, I believe a semi-automated approach would be great to have. For some, the outcome might be satisfactory, for others not - and these could start with (Q)GIS and continue later in a graphics package.

Andreas

On 2021-10-08 08:54, Andreas Neumann wrote:

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><mailto: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><mailto: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><mailto: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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