ACE is a multi-purpose translator tool compatible for converting designs (from micro IC/Mems using nanometer dimensions, to GIS maps using kilometers dimensions). Here's a somewhat related support link, https://support.numericalinnovations.com/support/discussions/topics/14000004648
To change ACE database accuracy:
By default, ACE automatically optimizes it's internal database units to be compatible with any format types you are converting. However if you're not getting the results you require there is a setting to adjust the ACE "Database Accuracy".
Optimized: By default, ACE automatically adjusts it's internal database units to be compatible with any format types you are converting. Here's the other database accuracy values:
Large (1/10 um)
Medium (1/100 um)
Small (1 nm)
Micro (1/10 nm):