[Qgis-user] Georeferencing a DXF file

[Andreas Neumann]

Hi Richard,

On 2021-02-04 09:43, Richard Duivenvoorde wrote:

> On 2/4/21 9:23 AM, Andreas Neumann wrote:
> 
>> The same discussion also pops up in the Swiss and QGIS user group 
>> e-mail lists again and again and I believe it should be able to come 
>> up with funding, if some developer could take the lead on implementing 
>> this in QGIS core. I was hoping that Jürgen would be available to 
>> implement it, as he also did the DXF/DWG importer and it would make 
>> sense, that the DXF/DWG importer also integrates with a vector 
>> georeferencing solution.
> 
> Hi Andreas,
> 
> Sorry but I fail to see the dxf 'connection' :-). Would this not be a 
> very generic vector tool, for example to be used by people who receive 
> svg's or so.... or data which they do not know the crs of or....

I agree that the vector georeferencing should also be possible for other 
non-dxf data, as a separate tool - but if done properly, both cases 
would be possible.
   The majority of the DXF files from architects and planners is 
typically not in the correct CRS coordinates. It is a very common case, 
having to fit the DXF data to the other GIS data (typical some form of 
cadastral data). In this case, it would be really, really nice if the 
DXF/DWG importer could already integrate the vector geoereferencing into 
the import process.

> Also: this is very much about 'data quality', not sure if I would make 
> QGIS be responsible for fixing data if people feed messy data into 
> QGIS...?

Yes - but the reality is, that the majority of the DXF/DWG data is not 
using real-world CRS coordinates, but some local system.

> Isn't it better to make the plugin just work (and also promote it a 
> little, I never would have made the connection about 'vector 
> georeferencing' and 'bender' ;-)

The vector bender should definitely serve as an inspiration for the core 
implementation, but I really think this needs to work in QGIS out of the 
box, without the need of installing plugins.

Plugins are often a major source of instability and frustration for QGIS 
users ... and they often fail to work in upcoming QGIS releases. This 
doesn't mean I don't appreciate the work of a plugin developer, in this 
particular case the work of the author of the "Vector Bender" plugin - 
the outcome and quality of plugins is often great - but once the 
functionality of a plugin becomes "mainstream" we should consider 
implementing the same thing in C++ in QGIS core.

Thanks for the discussion!

Andreas
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