Take the 2-minute tour ×
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It's 100% free, no registration required.

I have multiple line layers that represent bus routes and many of the routes overlap (i.e. near terminals, transfer locations, etc.) Is there a function in Qgis which will display both features next/parallel to each other? In the example link, the Red and Purple lines are two separate routes, they both utilize the same roads. The purple line overlaps the red line and the red line is not visible. I appreciate any feedback, even with the bad news that it is not possible.

http://imgur.com/sPyGqWW

share|improve this question

3 Answers 3

Read your request already at the mailing list. As none of the geeks really answered, i'm not sure if my propsal is the right one.

In GRASS, there is the v.generalize function with a displacement. As far as i understood from reading a while ago, it is meant for separation of overlapping or very close lines.

v.generalize input=roads_dr output=roads_dr_disp method=displacement alpha=0.01 beta=0.01 threshold=100 iterations=35

Better read the whole (not really extensive) thing yourself. http://grasswiki.osgeo.org/wiki/V.generalize_tutorial#Displacement

I tried it once through the toolbox, but somehow i never reached my goal. So the trick will be to find proper parameter settings, i guess

share|improve this answer

You can use an offset for one of the two routes. You find the option for each line style.

share|improve this answer

The only thing that comes to my mind is to change a thickness and transparency of the red line to be thicker and more transparent than purple line.
If these two lines belonging to the same layer,

share|improve this answer
    
I do not think that Qgis have a function that will display both features parallel to each other unless you do it manually –  hapa Mar 6 '13 at 15:37

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.