14

I need to buffer a series of lines by 40m, however I only want the buffer to come off the sides and not off either end of the line.

I know in ArcGIS there is a "flat-ends" tickbox that achieves exactly this, however unfortunately I can't use ArcGIS at this current time.

Is there any way to achieve this in QGIS?

I've had a look at some of the work arounds, but due to the scale of my datasets (national road networks) none of the ones I have found so far are feasible.

12

If you use the v.buffer tool in the Grass Commands toolsets, you can make a flat buffer.

There there are two choice boxes v.buffer If you have Make outside corners straight set to No, and Don't make caps at the ends of polylines as Yes, the result should be similar to the ArcMap straight edge buffer.

The following are the 3 combinations of the above two checkboxes, note the binary combination in the layer name (0 = no, 1 = yes). v.buffer results

You should probably also run a topology fixer/cleaner before, the Grass tool tends to return funny results if the topology isn't perfect

  • Excellent this is exactly what I needed, had no idea QGIS had those GRASS commands squirreled away. Thank you kindly. – rfreeman92 Oct 1 '14 at 9:18
  • NB: Is there any way to ensure that the buffers created are individual polygons and not dissolved into one giant polygon? – rfreeman92 Oct 1 '14 at 9:24
  • I am also interested in getting individual polygons and not one dissolved polygon. IS this possible? – user32882 Jul 26 '18 at 8:41
3

OpenJUMP may not suit you because all data must fit in memory but with 64 bit jre the limit is rather high. Most important, it can.

enter image description here

  • 1
    OpenJUMP's buffer tool accomplished this better than QGIS or Esri! – sirgeo Jun 2 '15 at 18:24
  • Just saying thanks for presenting me a software that appears to be much faster in many of these fundamental algorithm! :D – jhc Nov 27 '15 at 19:32

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

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