Same problem as another thread: Field Calculator returning incorrect length and area values
Trying to calculate length of a line shapefile, and field calculator is returning values that are way too high (by factor of 1000 or more, like the thread above). Both the shapefile and the project are projected in NAD83 / North Carolina (ftUS) - so they are consistent. The preview shows lengths that appear correct/reasonable, but then the calculated value that is returned is way off.
See attached image - shows that output preview looks right, but then the calculated values (to the right) are way higher and don't match the output preview.