[Qgis-user] Placing group of image at once

[Andreas Neumann]

Hi Léopold,

These are "top-view" images - right? Taken from a drone? Or a special rail
coach and a

Maybe you can mosaic the images with some photogrammetry software and
create GeoTIFF images?

The display performance of many thousand individual images (each on its
own) might not perform / scale too well?

Greetings,
Andreas



On Wed, 20 Aug 2025 at 16:20, Léopold Stoessel via QGIS-User <
qgis-user at lists.osgeo.org> 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 <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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-- 

--
Andreas Neumann
QGIS.ORG board member (treasurer)
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