I'm trying to work out how to calculate the length of a line to only 2 decimal places in QGIS. When I use the field calculator to create a new field, it doesn't matter what changes I make to the field type, field width or precision, I continually get the length to 13 decimal place.
Answer
In the latest dev QGIS version there is a new round function which you can use to control the number of decimal places:
round($length,3)
Result: 1.10228762876525 -> 1.102
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