# 2D transformation without rotation

Is there a name for 2D transformation with the least squares adjustment having the following parameters:

shift_x, shift_y, scale.

Transformation does not use any rotation... Thanks for your help.

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Do you mean an affine transformation? All transformations of the form you've mentioned are affine, though affine transformations can include rotations too. –  Billy Aug 19 '11 at 16:31
I'm not aware of any exact term; I would just call it a composition of a translation and a scaling. Although if you consider "affine transformation", then "similarity transformation" would be more specific as it rules out shearing. –  Rahul Aug 19 '11 at 16:34
I wonder, if this transformation has the exact name (like Helmert...). It belongs to the group of affine transformations. –  johnas Aug 19 '11 at 16:36