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<p>Hi list -</p>
<p>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). <br>
</p>
<p>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.</p>
<ul>
<li>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. <br>
</li>
<li>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.<br>
</li>
</ul>
<p>However, Is there any plug-in that can:</p>
<ol>
<li> Digitize a set of positions from the original data.</li>
<li>Digitize or manually set the corresponding positions in the
destination CRS</li>
<li>Create the translation, scale and rotation parameters using
data from (2)<br>
</li>
<li>Run the "Affine transformation" algorithm to transform the
data to the right position in the chosen CRS </li>
</ol>
<p>In short - a Georeferencer for vector data</p>
<ul>
<li>A name of a functioning plug-in would be lovely<br>
<br>
</li>
<li>A set QGIS classes/methods that could help with establishing
the transformation matrix and other stuff would be really nice<br>
<br>
</li>
<li>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 <br>
</li>
</ul>
<pre class="moz-signature" cols="72">--
Med venlig hilsen / Kind regards
Bo Victor Thomsen</pre>
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