I think what he is referring to is georeferencing and reprojecting, you can read how it works in e.g. QGIS here https://docs.qgis.org/3.16/en/docs/user_manual/w

I think what he is referring to is georeferencing and reprojecting, you can read how it works in e.g. QGIS here https://docs.qgis.org/3.16/en/docs/user_manual/working_with_raster/georeferencer.html https://docs.qgis.org/3.16/en/docs/user_manual/working_with_...