I have created a points layer which represent Ground Control Points (GCP) for georeferencing scanned topographic maps via 'Add Layer > Add Delimited Text Layer', where I saved coordinates in a .csv format that has the lat-lon of each point, stored in DMS coordinate system (I am using DMS as the scanned topo maps use DMS).
I have managed to load the .csv as a Shapefile. Now, I open up the Georeferencer, load the scanned topo map, and click 'File > Load GCP points', however it requires a Ground Control Point file with the *.points extension, and not a Shapefile.
I would prefer not to manually reassign all the control points. How do I convert a Shapefile to a GCP (.points) file? If that is not possible, how do I create a GCP (.points) file? What file formats can I use to create the required GCP (.points) file?
My goal is to be able to load it into the Georeferencer. I am using QGIS 3.2.1.
When I change the extension of the .shp to .points, it becomes a POINTS file (.points), but QGIS will prompt me the following; "Invalid GCP file. File could not be read."