I have lines around which I have created multiple ring buffers at several intervals. I have another line (call it the flight line) which in theory should overlap the original line. I need to work out how much of the flight line falls within each of the buffers of the original line. See attached picture.

enter image description here

So, my plan of attack was to do an intersect of the flight line with the buffer, creating a point output. I was then planning to do a 'Split Line at Point' then using the attribute table to work out the lengths.

However, when I do the intersect, points are not created at all of the intersections with the buffer, just some of them, randomly.

Any ideas what I am doing wrong? Or is there an easier way to do this?

  • Have you tried spatial join? You can use merge rules to calculate sum of the length of line field.
    – Fezter
    Commented Jun 8, 2016 at 4:57
  • Could you replace your current picture with something that is much more zoomed in, please?
    – PolyGeo
    Commented Jun 8, 2016 at 6:25
  • Absolutely.So the yellow line is the original line, buffers surrounding and the black line is the flight line.
    – Bec
    Commented Jun 8, 2016 at 6:32

1 Answer 1


Why do you want to create a point output? Do the following:

  • add a field and calculate the length of the "fligth line"
  • intersect the "flight line" with the "buffer polygon"
  • dissolve the "flight line buffer polygon line" depending on the "buffer polygon"
  • calculate the length of the "flight line buffer polygon dissolve line"
  • devide the length of the "flight line buffer polygon dissolve line" by the original length of the line
  • Thanks Alex, I needed the point output only so I could then split the line at the point. I'll have a go at your suggestion
    – Bec
    Commented Jun 9, 2016 at 6:46

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