Helmert Description Name class Tinman.Georef.DatumOp.Helmert Derived from DatumOp Position Vector transformation (EPSG dataset coordinate operation method code 1033) Fields / Required source Type Ellipsoid The source coordinate system (ellipsoid specification). target Type Ellipsoid The target coordinate system (ellipsoid specification). Fields / Optional t Type Vec3 Default {Vec3: 0, 0, 0} EPSG-8605: X-axis translation (tX) EPSG-8606: Y-axis translation (tY) EPSG-8607: Z-axis translation (tZ) r Type Vec3 Default {Vec3: 0, 0, 0} EPSG-8608: X-axis rotation (rX) EPSG-8609: Y-axis rotation (rY) EPSG-8610: Z-axis rotation (rZ) dS Type number Default 0 EPSG-8611: Scale difference (dS) Append Linear