Hello, Even I tried to generate Japanese datumgrid files (*.gsb). https://github.com/OSGeo/proj-datumgrid/issues/68#issuecomment-560420438 https://github.com/tohka/JapanGridShift ToDo: I need to validate more results of transformation. Sincerely -- 有田 直樹 <ToNaokiArita @ gmail.com>