Based on the Helmert family of transformations, a 4 Parameter Helmert 3D transformation is similar to a 7 Parameter CFR transformation, except it does not include rotations.
Parameters needed to define a 4 Parameter transformation are:
|
Parameter |
Often Noted as |
|
X Translation |
dX |
|
Y Translation |
dY |
|
Z Translation |
dZ |
|
Scale |
k |
The 4 Parameter Helmert transformations used in Vector Scale, Translate and Rotate jobs are 2D transforms using only the parameters X Translation, Y Translation, and Scale.