I am trying to create with PROJ a custom CRS in QGIS 3.2.0 - but I fail.
I have a local, cartesian coordinate system and a transformation report (2D-Helmert) with the following parameters: translation of the x-axis, translation of the y-axis, scale factor in ppm and rotation angles. With this Helmert-transformation the local coordinates should be transformed into cartesian WGS84 coordinates.
So I am trying something like this: proj=helmert x= 2956.5331 y= 5917.9548 z= -28.7120 rx= -0° 00' 09.19941" ry= -0° 00' 02.81345" rz= -1° 39' 10.90398" s= 1 + 0.1347 ppm
I get an error message - am I doing something completely wrong?
Glad about any answers...