Similar to Field Calculator returning incorrect length and area values, but as always slightly different.

I have QGIS 2.0 and when I create a polyline shapefile, the field calculator returns the correct lengths. However the next time I open the project or the shapefile in a new workspace, when I click and the field calculator to update the line lengths, the numbers (in one instance) go to the 10,000,000's.

I have checked the project workspace it is in UTM Z51S and the units are in metres and the shapefile projection is the same.

I have updated the values to be zero first and then use $length to no avail. I have even tried to changing the projection to WGS84 with units as metres and the values are in degrees. It even happens when I create the values in a new field.

1 Answer 1


Rob - I had the same problem myself. The solution appears to be to turn off the project "on-the-fly" projection (Project > Project properties > CRS). The measurements come out correct once you do this. There was a similar problem in QGIS 1.7 and 1.8.


Your Answer

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

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