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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.

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2 Answers

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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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I guessed that there would be a simple expression, thanks Nathan – geomiles Jan 14 at 12:05
when 1.9 rolls out? – nickves Jan 14 at 14:36
1.9 is not being released. 2.0 is the next release hopefully in the next few months. – Nathan W Jan 14 at 22:33
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You need to save the file, before the changes to precision are fully displayed.

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In QGIS Master, you also have to leave edit mode and/or close and reopen the attribute table. – Andre Joost Jan 14 at 10:46

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