[Qgis-user] Placing group of image at once

[Richard Duivenvoorde]

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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