[Qgis-user] Georeferencing a DXF file

Walt Ludwick walt at valedalama.net
Sat Feb 6 08:03:39 PST 2021


Thanks for the tip, @uclaros ; i do have the grass v.rectify algorithm in
my Processing Toolbox, but am not quite understanding how to use it.. And the
online documentation
<https://grass.osgeo.org/grass79/manuals/v.rectify.html> i've found is no
great help.

I'm guessing i just need to map a couple of 2D ground control points to the
corresponding points on this vector object, in order resize & move it to
its proper place.  In this project's CRS (EPSG-3763) two opposite corners
of the building's roof would be -44371.951,-280480.105
and -44299.756,-280487.420, respectively... But how then would i map these
GCPs to the imported vector object (which has no geocoordinate attributes)
in such a way that the algorithm can understand what it needs to transform?

Any pointers on how to apply that algorithm to this case would be most
appreciated!

/walt

The grass v.rectify algorithm does exactly that, you'll have to manually
> collect your gcps though.
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