[Qgis-user] mapping bus routes

[Nicolas Cadieux]

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> 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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