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QGIS: Shifting ortophotos by some meters to equalize the mismatch/offset/incongruence with satellite imagery

Geographic Information Systems Asked by jaysigg on July 25, 2021

I got several true ortophotos from environmental authorities. These photos should serve as reference for classifying pixels of satellite records.
Though the authorities told me that the georeferencing accuracy of their photos was below half a meter, there is obviousely a total shift of about 20 meters towards east in relation to my satellite imagery. (There might be also a small north-south-offset, but obviousely not as crucial; – I have not checked yet more accurately.)

My question is now:

  • Is there a way (Qgis-implemented option, plugin, python-script, customizing CRS, …) to shift the ortophotos 20 meters back towards west (+ maybe also some meters north-south)?
    Respectively, if there were more options: Which one would you prefer?
  • If possible the shift should be made by ‘virtual reprojecting’, i.e. without changing / recalculating the photo itself!? My project CRS is EPSG:32633

I could not find any option so far. On top, I am not a geographer (but ecologist) and quite new to QGis. I’m working with QGis-3.16 Win10.

One Answer

I would trust geo-referencing of orthos more than that of satellite imagery. Especially from those with less stable orbits. Verify against OSM or similar the spatial accuracy of the orthophotos.

If you need to move the satellite imagery use the QGIS georeference functionality.

https://www.qgistutorials.com/en/docs/3/georeferencing_basics.html

Answered by Tisham Dhar on July 25, 2021

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