I have a set of points in an unknown crs. How can I convert (not guess) this to a given crs? I know, or rather I can determine the actual coordinates of each point in order to have some reference points to match against. How can I convert the rest of the points using these reference points? I have done this with raster images (using qgis + georeferencer plugin) , but I don't seem to find any tools for doing this with points. I don't need great accuracy.
I have managed to center it and scale it in a very naive and linear based on a single reference point (near the center) but the accuracy is pretty bad, specially with points far away from the reference point.