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If you have an accurate location of your balloon, as well as accurate yaw, pitch, and roll (YPR) for the camera, calculating the direct vector between the lens and the ground is a matter of trigonometry. With that vector, an elevation model, and the camera specs, you can calculate the expected footprint of your image. You can look at this description from ...


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The message about not georeferenced image is partly misleading. The georeferencing method that gdalbuildvrt support is the affine GeoTransform https://gdal.org/user/raster_data_model.html. Your image is georeferenced with Ground Control Points (GCP). GDAL datasets have two ways of describing the relationship between raster positions (in pixel/line ...


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Already georeferenced image can be georeferenced with QGIS georeferencer without removing old georeference info first. However, georeferencer does not update the old image but it writes out a new image. It is also possible to update the georeference of the image without writing the pixels again but in this case the old georeference information must be wiped ...


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