#Georeferencing #historical #maps by their coordinates is not without its pitfalls. A location in LAT / LON can only be intrepreted with spatial context. While there are some historical proj-strings out there (e.g. DHDN, EPSG:4314), one needs to calculate them for other historical spatial reference systems (SRS) using identical coordinates. Thanks to @jjimenezshaw there is now an accessible solution in #python 🤩 👇
https://github.com/jjimenezshaw/helmert-calc/ @fidkarten @historicum_net @DHd @oldmapgallery