I'm trying to create a CRS for a local mine grid that involves the translation and rotation of GDA94 / MGA zone 55. The origin is translated 2195129.073 in the +x direction and by 5489615.789 in the +y direction, then the x-y plane is rotated about the origin by 68303 arc seconds. This is the proj4 for GDA94 / MGA zone 55:
+proj=utm +zone=55 +south +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs
This is the proj4 I have used to try and make the local mine CRS:
+proj=utm +zone=55 +south +ellps=GRS80 +towgs84=2195129.073,5489615.789,0,68303,68303,0,0,0 +units=m +no_defs
The custom CRS currently doesn't work.
Why is it not working?
Test points; Custom Grid (15360, 6840), GDA94/MGA55 (303370.3,5916524)