I've seen a lot of questions involving splitting a line with the help of a point layer. I want to split a line in fractions of its length. For example, I have a line 400 meters long, I want to split it into four lines of 100 meters long each. There is the grass module v.split, but I get an error message when I start it from the qgis toolbox :

*"TypeError: object of type 'NoneType' has no len()"*

So I'm not sure, if I get it to work, if this would be a solution.

  • Please clarify: Do you want to split by length i.e. ever 100 meters or into a specific number of parts? – underdark Oct 6 '14 at 18:25
  • Into a specific number of parts. Joseph, below, has given a good workaround. – Gilles Oct 22 '14 at 15:34

The v.split.length function from GRASS should do exactly what you want by splitting the line into equal segments defined by the user without the need for a point layer. Here's a simple example of a straight line (it also works on non-straight and multiple lines):

Simple line

I added a column to calculate its length using $length in the expression:

Line attribute

Using the v.split.length function from GRASS via the Processing Toolbox, I chose to split the line into 25m segments which should make a total of 4 parts:

v.split.length function

I then updated the Length column of the output layer and used the same command as above to re-calculate the length:

Attribute result

Not sure why you are receiving the error, could you share your line layer for people to test?

  • Hello, thanks for your answer. It is working. It's not splitting the line in fractions of the lenght though, as I still have to calculate the number of segments from the measured length, but it's a good workaround. Thank you. – Gilles Oct 22 '14 at 15:31
  • Apologies for not giving you a definitive answer but I'm glad it's a workaround atleast. Most welcome buddy! – Joseph Oct 23 '14 at 11:43

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