[Qgis-user] Public transportation maps

[G. Allegri]

Maybe flow map layout algorithms could go in that direction, but I haven't
reflected enough to state it...
http://en.wikipedia.org/wiki/Flow_map

giovanni

2013/3/5 Spencer Gardner <spgardner at hntb.com>

> This is a problem that I’ve spent much time thinking about. I have never
> come across a satisfactory automated solution. The problem is that as the
> transit system becomes larger and more complex, dealing with line offsets
> also becomes exponentially complicated. From experience, I can say that it
> is hard enough trying to lay out a system map by hand – I couldn’t even
> begin to describe an algorithm for automating it.****
>
> ** **
>
> ESRI has a Schematics extension<http://blogs.esri.com/esri/arcgis/2007/12/12/create-route-maps-with-the-arcgis-schematics-extension/>that is intended for this purpose, although I suspect it is not entirely
> reliable. I have not seen any comparable open source solution but would
> love to hear about one if anyone else has suggestions.****
>
> ** **
>
> Depending on the level of abstraction, I tend to do all of my transit
> network diagrams in a vector drawing program such as Inkscape and only
> utilize GIS for background reference material.****
>
> ** **
>
> Spencer****
>
> ** **
>
> ** **
>
> *From:* qgis-user-bounces at lists.osgeo.org [mailto:
> qgis-user-bounces at lists.osgeo.org] *On Behalf Of *Olivier Dalang
> *Sent:* Monday, March 04, 2013 10:55 AM
> *To:* qgis-user at lists.osgeo.org
> *Subject:* [Qgis-user] Public transportation maps****
>
> ** **
>
> Hi !****
>
> ** **
>
> Does any of you have some experience in creating public transportation
> maps (bus) with QGis ?****
>
> ** **
>
> The main problem I have is representing superposed lines with an offset
> (as here : http://www.cuk.ch/images/articles/3714/tpg_plan.jpg )****
>
> ** **
>
> For the sake of editability and multi-scale display, I'd like to use "line
> offset" rather than actually offsetting the lines.****
>
> One solution would be to offset each bus line of a different amount, but
> then, when not superposed, the bus line would display beside the road...**
> **
>
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>
> It seems line offset can't be data-defined... Is there a workaround ?****
>
> ** **
>
> Thanks !!****
>
> ** **
>
> Olivier****
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-- 
Giovanni Allegri
website: http://giovanniallegri.it
GEO+ geomatica in Italia http://bit.ly/GEOplus
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