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
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