I have a question regarding the
$area function in QGIS and St_Area in PostGIS.
I am trying to calculate the exact area of Polygons stored in a Shapefile in UTM 25832 and do not know which functions are the correct ones to use. I know that the difference between
$area in QGIS 3.10 is that the first is calculated planar and the second with ellipsoid.
I have also tried to calculate the area with ST_Area in PostGIS and get the same result as in QGIS with the area function or with ArcMap.
When my data is projected as UTM 32N (EPSG:25832) isn’t it already planar and can be calculated with the simple
area() function instead of
$area? Or do I have to use the
$area function even if it is in UTM32?