[PROJ] Affine transformation for engineering crs

[Gabriel De Luca]

Hi,

 The EPSG:9624 method is a 2D transformation, so the translation vector has
only two elements and the rotation matrix has only two rows and two columns.
  In the description of the EPSG method, the algebraic expression is found
but in the documentation of the affine transformation in PROJ it is
expressed in its matrix form.
  The equivalences are as follows:

A0 = +xoff
A1 = +s11
A2 = +s12
B0 = +yoff
B1 = +s21
B2 = +s22


Regards,
Gabriel

El mié, 1 jun 2022 a la(s) 08:03, Torill Kjøsnes Gabrielsen (
torill.kjosnes at gmail.com) escribió:

> Hi,
>
>
>
> I have an engineering crs that I would like to transform with an affine
> transformation.
>
>
>
> The transformation for the crs is defined in 9624:
>
>
> https://epsg.org/coord-operation-method_9624/Affine-parametric-transformation.html
>
>
>
> The coordinate transformation parameter values are:
>
> A0 = 82357.457 metres
>
> A1 = 0.304794369
>
> A2 = 0.000015417425
>
> B0 = 28091.324 metres
>
> B1 = -0.000015417425
>
> B2 = 0.304794369
>
>
>
> Is there anyone who can help me address which parameters correspond to
> those defined in PROJ affine?
>
>
>
> A0 = +xoff?
>
> A1 = +s11?
>
> A2 = ?
>
> B0 = +yoff?
>
> B1 = +s22?
>
> B2 = ?
>
>
>
> Regards,
>
> Torill Gabrielsen
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>
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