[Qgis-user] Placing group of image at once

[Kirk Schmidt]

Hi All:

I believe these will be oblique photo's and therefore not georeferenced 
in the traditional sense.   Therefor, world files would not work as they 
are not designed to handle perspective geometry.  I believe geotiffs  
can handle perspective geometry.

Good Luck

Kirk Schmidt



On 8/20/2025 7:04 PM, Richard Duivenvoorde via QGIS-User wrote:
> Hi,
>
> Looks like a fun project.
>
> Can you provide the accompanying xml file for 'Try.jpg'?
>
> Because if you can create some script to convert that Try.xml to 
> Try.wld (or whatever extension gdal/QGIS wants for a jpeg world file), 
> you can maybe create a mosaic geotiff from it, though it will be 
> HUGE...).
> Looking at: https://gdal.org/en/stable/drivers/raster/jpeg.html GDAL 
> (the lib that loads rasters for QGIS, expects .jgw, .jpgw/.jpegw or 
> .wld suffixes, not PGW ???)
>
> There is also a 'vrt' (GDAL Virtual Format) for all your jpg+wld files 
> (https://gdal.org/en/latest/drivers/raster/vrt.html).
> Normally you will create a 'shapefile' then with the extents of all 
> the images, which is then used as spatial index for gdal.
> Not sure if that can take into account rotation though.
> Hopefully somebody has some info about that.
>
> Last option could be, depending on the names of the xml and jpg files 
> to do this loading 'on the fly' using some pyqgis... Like find all 
> files in current extent and (by reading/interpreting the xml files) 
> create the wld file on the fly and load every jpg+wld as layer...
>
> Also you do want to view all the raster/photo's as rasters, yes? Not 
> as vector points with a popup showing the (rotated?) image?
>
> See what others come up with?
>
> It IS a lot of data to play with though :-)
>
> Regards,
>
> Richard Duivenvoorde
>
>
> On 20-08-2025 16:20, Léopold Stoessel via QGIS-User wrote:
>> Hello,
>>
>> Our team is currently working on a project to reconstruct the 
>> railways of Canada using QGIS. To do this, we collect data directly 
>> on the rails, taking a photo every 2 meters. Each image (JPG) is 
>> accompanied by an XML file containing its GPS coordinates (EPSG:4326) 
>> and orientation.
>>
>> Our goal is to display all the images on a QGIS map at their correct 
>> geographic location and with the proper orientation. (Example image: 
>> /Try.jpg/)
>>
>> As far as I understand, a JPG file needs either an associated PGW 
>> world file or must be converted into a georeferenced TIFF in order to 
>> be correctly placed on the map.
>>
>> Here are the challenges we're facing:
>>
>>   * *PGW method*: I tried placing a PNG file with a PGW of the same 
>> name in the same directory, but QGIS seems to ignore the PGW file and 
>> creates HTML document with other coordinates instead.
>>   * *GeoTIFF method*: With over 500,000 images, manually 
>> georeferencing each one is not feasible.
>>
>> So I would like to ask for your advice:
>>
>>   * Are we on the right track with our approach?
>>   * Which method would you recommend in our case?
>>   * Do you know of any way to automate the image placement and 
>> orientation based on our XML data?
>>   * Would it be possible to handle this through the Python console or 
>> using PyQGIS?
>>
>> Any guidance or suggestions would be greatly appreciated.
>>
>> Thanks in advance for your time and help!
>>
>> **
>>
>> **
>>
>> ** <https://www.cefrail.ca/>** 
>> <https://www.facebook.com/cefrail>**<https://www.linkedin.com/authwall?trk=bf&trkInfo=AQEjKKnHH0hB2QAAAYzqp8YogvhljVV4rfWfPZk4nt7Fxp7t-jgeC03T84SUqgFnFtN8YLHip3me96M7mf832Uiq6YnFyyw3y1AU8c10Tw4twclYPuLl6KexU9lj_p4Hp_UeifI=&original_referer=&sessionRedirect=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fcefrail>
>>
>>
>>
>> *Léopold Stoessel*
>>
>> Stagiaire - Génie ferroviaire
>>
>> 1 866 544-RAIL
>>
>> _leopold.stoessel at cegepsi.ca <mailto:leopold.stoessel at cegepsi.ca>_
>>
>> _www.cefrail.ca <http://www.cefrail.ca/> _
>>
>> /RAIL est un centre intégré au Cégep de Sept-Îles/
>>
>>
>>
>>
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-- 
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
26 Church Road
Sutherlands River, NS
B0K 1W0
Tel (902) 922.3607
Email: kirk at nortekresources.com
Web: www.nortekresources.com