Frequently used for rectification of digitised maps. Sometime known as “rubber sheeting”. See §126.96.36.199 in IOGP Publication 373-7-2 – Geomatics Guidance Note number 7, part 2 – April 2015.
Implemented in SIS by the matrix package. The critical part of this task is not the EPSG:9624 operation itself, but the matrix package which is behind it and reused in many corners of SIS.