[Qgis-user] Extract lat/long coordinate from a custom projected layer

[Pietro Rossin]

Hi all
I'm trying to understand how Qgis handles coordinates extraction coming from
a layer that is projected by a custom transformation.

I have a list of points in monte mario Italy zone 2 - 3004 that I want to
reproject to Lat/long WGS84 with conversion between these two crs based on a
NTV2 grid file.

So, I load a xy temporary layer in a 3004 crs project and I save it as a shp
(3004).

Then I change the crs to 4326 and I use the transformation manager
(transformation tool) pluigin to adjust the on the fly reprojection from
3004 to 4326 based on the NTV2 grid file.

If now I try to calculate the lat/long values with field calculator with $X,
$y variables Qgis returns original Monte mario metric values, right?
So I must save as new 4326 shp my 3004 layer to calculate Lat/long WGS84,
right?

Saving to 4326 Qgis mantains the NTV2 transformation so I can calculate more
accurate coordinates?

Thanks
Pietro

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