Hello Marcel,
to calculate affine transformation parameters you must have at least 3
points in both coordinate systems.
LV95_y = Y0 + a * local_y + b * local_x
LV95_x = X0 + c * local_x + d * local_y
If you set up the equations for the three points, you get to linear
equation systems, one for Y0, a, b unknowns, and another fo X0, c, d
unknowns.
It is highly recommended to use more points and least squares estimation
for the parameters.
Best regards,
Zoltan
On Tue, 7 Oct 2014, Marcel Stadelmann wrote:
Hi,
I would like to make an affine transformation with a vector layer shape file,
using the Affine Plugin. I know from two points the correct coordinates:
local_y local_x LV95_y LV95_x
9.065056 7.70714 2753308.44 1166381.26
9.065056 -5.085236 2753295.68 1166391.31
How can I calculate the transformation parameters?
Marcel
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