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, <[email protected]> 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 #ยค%&! 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 > > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >
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