I have a shapefile with CRS ESPG:32632 where are shown some power lines of a northern Italy area.
I need to calculate the length of the lines and add it, as a new field, in the attribute table. I am also asked to provide the shapefile with with CRS ESPG:4326.
If I save the file with the CRS ESPG:4326, reopen it and then perform the length calculation (function
$length of qgis field calculator) the results appear incorrect.
If instead I perform the length calculation operation with the original CRS and only then save the file with CRS ESPG:4326 the result seems ok.
Can someone explain to me why?