I'm pretty new to GIS in general and I'm trying to take an absolute value of the difference between two fields in field calculator when creating a new field, but using ABS () returns an invalid expression in Preview. ABS () is not listed on the supported expressions--is there a way around this? Thanks! John
1 Answer
You seem to use QGIS 1.8, because the development version (soon to be 2.0) supports abs().
Instead, you can use
sqrt(value*value)
... replace value with your attribute.
answered Jun 4, 2013 at 19:36
