How to you compare two layers in QGIS to get the positional accuracy?

  • 5
    Is that a homework question?
    – underdark
    Commented Jun 6, 2012 at 17:34

1 Answer 1


I have done this when comparing collected GPS points to known positions. You want to use the distance formula Sqrt((x2 – x1)² + (y2 – y1)²).

What I did was to add two new columns (X2 and Y2) to my GPS points and populate those columns with the known X and Y coordinates. In my dataset I had the X and Y coordinates of my GPS data in columns X1 and Y1. Using the distance formula I was able to calculate the positional accuracy of my GPS points relative to the known reference locations.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

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