I am currently trying to create an Affine which can transform data from longitude and latitude to a custom CRS that a client is using. Unfortunately the person who originally made this CRS has left and they have no metadata relating to their custom coordinate system.
They have provided me a number of points with coordinates in both their custom CRS and longitude and latitude. They have told me it is a true projected coordinate system and I have managed to identify a local CRS which is fairly close to it.
Currently I am manually trying to calculate the rotation and stretching for the Affine manually.
Are there any quick methods available when the fixed corners of each grid are known?