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This question already has an answer here:

In QGIS, I need to calculate the distance between certain points and save this information as a line shape file, in which the attribute of each element (line) is its length (distance between points).

For this I have created a temporary draft layer of lines to draw the lines and I have obtained this:

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Now, how do I calculate the lengths and save them as an attribute of the elements?

marked as duplicate by ahmadhanb qgis Sep 11 at 14:56

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Open the attribute table of your draft layer of lines and create a new field with the field calculator. Use $length or length ($geometry) to calculate the length of the lines in your layer. Be careful what you measure: "You need to use a Projected Coordinate Reference System with units of meters or feet to perform such calculations"

  • Thank you very much for your help. – JVL Sep 11 at 16:04

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