I am experimenting with using Ground Control Points (GCPs) for some scans but the online tool “GCP Editor” for generating GCP text files is not very intuitive. I understand that you cross reference features in your image set to an existing map. However I can’t figure out how to link a given GCP to multiple photos with the same GCP. I have yet to find a good tutorial showing how to use this. Does anyone have experience with this or can you point me to a tutorial?