[Qgis-user] Use of $length

[Andre Joost]

Am 28.03.2013 21:03, schrieb Patrice Vetsel:
> I wan't to add the length of a line as label in a shape file layer.
>
> I use the $length but when I use the tool to measure I don't have the
> same values.
>
> I'v found on the net that may be I must use a special projection
> (here I'm using EPSG:4326)
>
> It's seem's complicated, may be it's missing feature to add a "metric
> length" in label tool ?

If your shape file is in EPSG:4326, the layer units are in degrees, and 
the result of $length will also be in degrees.

If you want the length in metres, try a UTM projection suitable for your 
part of the world.

HTH,
André Joost