[Qgis-user] Transform vectordata using affine transformation

[Charles Dixon-Paver]

In terms of a functioning plugin for this you can search for the "vector
bender" in the qgis plugins

On Sat, 25 Sep 2021, 18:49 Bo Victor Thomsen, <bo.victor.thomsen at gmail.com>
wrote:

> Hi list -
>
> One of my customers just received a data file, where the coordinates is
> not in any projection: Center of map data is (0,0), units in mm. not meter,
> maybe some rotation too. However, at least it's a planar coordinate system
> (I hope).
>
> Instead of sending the #¤%&! data file back to the "GIS no-good" architect
> who send it , I've decided to - once and for all - to find a method to
> transform this kind of data to a reasonable CRS using an affine
> transformation.
>
>    - I'm aware of the Processing algorithm "Affine transform" that can do
>    the actual transformation once I know the translation, rotation and scale
>    coefficients of the transformation.
>    - And I know how to find the affine transformation matrix using a set
>    of points from the data that corresponds with a set of points in the
>    destination CRS.
>
> However, Is there any plug-in that can:
>
>    1. Digitize a set of positions from the original data.
>    2. Digitize or manually set the corresponding positions in the
>    destination CRS
>    3. Create the translation, scale and rotation parameters using data
>    from (2)
>    4. Run the "Affine transformation" algorithm to transform the data to
>    the right position in the chosen CRS
>
> In short - a Georeferencer for vector data
>
>    - A name of a functioning plug-in would be lovely
>
>    - A set QGIS classes/methods that could help with establishing the
>    transformation matrix and other stuff would be really nice
>
>    - A "No" to all my wishes would suck. However, In that case, I can
>    start developing without have the nagging feeling that someone has done
>    this before
>
> --
> Med venlig hilsen / Kind regards
>
> Bo Victor Thomsen
>
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