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 <[email protected]> > 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:* [email protected] [mailto: > [email protected]] *On Behalf Of *Olivier Dalang > *Sent:* Monday, March 04, 2013 10:55 AM > *To:* [email protected] > *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...** > ** > > ** ** > > It seems line offset can't be data-defined... Is there a workaround ?**** > > ** ** > > Thanks !!**** > > ** ** > > Olivier**** > ------------------------------ > * > This e-mail and any files transmitted with it are confidential and are > intended solely for the use of the individual or entity to whom they are > addressed. If you are NOT the intended recipient and receive this > communication, please delete this message and any attachments. Thank you. > * > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user > > -- Giovanni Allegri website: http://giovanniallegri.it GEO+ geomatica in Italia http://bit.ly/GEOplus
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