[Qgis-user] Georeferencing dxf file in QGIS

[Zoltán Siki]

Hi,

I think the best solution is to use Georeferencer, in the newer versions of
QGIS you can use georeferencer for vectors, too.
Select Layer/Georeferencer from menu and read the manual:
https://docs.qgis.org/3.34/en/docs/user_manual/working_with_raster/georeferencer.html

The process is the same for raster and vector data.

Zoltan

Thomas Schüttenberg via QGIS-User <qgis-user at lists.osgeo.org> ezt írta
(időpont: 2024. máj. 15., Sze, 16:55):

> Hi Linda,
>
> have you tried the QGIS plugin "Vector Bender"?
> https://plugins.qgis.org/plugins/VectorBender/
> https://github.com/olivierdalang/VectorBender/blob/master/README.md
>
> Thomas
>
>
> > Linda Boisvert via QGIS-User <qgis-user at lists.osgeo.org> hat am
> 15.05.2024 03:02 CEST geschrieben:
> >
> >
> > Thank you Richard. Your suggestion was a step in the right direction.
> >
> > I had to import using the add vector layer then export as an ESRI
> shapefile and add the shapefile layer. That put all the features from the
> multiple dxf file layers on one layer and I was able to move the design.
> But it is important the keep the dxf layers separate and move the whole
> group of layers at once to maintain the relationship.
> >
> >
> > On Tue, May 14, 2024, 2:26 PM Richard Greenwood <
> richard.greenwood at gmail.com> wrote:
> > > You can just use the QGIS Move Feature tool, possibly in conjunction
> with the Rotate Feature and/or Scale Feature tools in the advanced
> digitizing toolbar.
> > >   1. Assign a coordinate system to the DXF layer. If you don't know
> the coordinate system, or if the DXF file doesn't have one, assign the
> coordinate system of your reference layer (your aerial photography)
> > >   2. Make your DXF file editable. Depending on how you imported it you
> may be able to make it editable, or you may need to copy all of the
> features to an editable work layer.
> > >   3. Select all of the features, pick the Move Feature tool, pick a
> source point on a corner of the building, pick a destination point on the
> corresponding corner in your reference layer. (this takes some serious
> panning and zooming!)
> > >   4. With all of the features still selected, pick the Rotate
> Feature tool, while holding the Control key click the building corner to
> fix the rotation base point, then click two more points to define the
> rotation angle.
> > >   5. You may need to scale it e.g. convert feet to meters. If so, pick
> the Scale Feature tool, hold the Control key and click a base point, then
> two more points to resize all of the features.
> > > The move, rotate and scale steps are performing an affine
> transformation which should provide reasonable results over small areas if
> both the DXF and reference layer are in projected coordinate systems,
> ideally local projected coordinate systems like State Plane or UTM, and not
> Web Mercator.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > On Tue, May 14, 2024 at 3:00 PM Linda Boisvert via QGIS-User <
> qgis-user at lists.osgeo.org> wrote:
> > > > Hello,
> > > >
> > > > I have been trying to georeference a dxf file created by a solar
> design software.
> > > >
> > > > I can import the file without issues but the design sits in the
> middle of the Pacific Ocean. I have georeferenced rasters before but I
> can't get this dxf file to budge.
> > > >
> > > > I have tried many of the suggestions I have found online for
> georeferencing the dxf file.
> > > >
> > > > I have tried to move the design using QAD and QAD did not find
> objects when I tried to select the design or any single line.
> > > >
> > > > I imported the file into LibreCAD and the file worked fine in that
> software.
> > > >
> > > > I imported the file into ArcGIS and I could not see the lines of the
> dxf file.
> > > >
> > > > I have attached a test dxf if someone wants to try it out and find a
> solution. The building is the Eugene Brucker Education Center 4100 Normal
> Street San Diego, CA 92103.
> > > >
> > > > Does anyone have any suggestions for georeferencing this file or any
> idea what the issue may be?
> > > >
> > > >
> > > >
> > > >
> > > > --
> > > >
> > > > Sincerely,
> > > > Linda Boisvert
> > > > _______________________________________________
> > > >  QGIS-User mailing list
> > > >  QGIS-User at lists.osgeo.org
> > > >  List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
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> > > >
> > >
> > >
> > >
> > > --
> > >
> > > Richard W. Greenwood
> > > www.greenwoodmap.com (http://www.greenwoodmap.com)
> > _______________________________________________
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