How can I see (and edit if possible) the transformation method and parameters used by QGIS for "on-the-fly" transformation, and then for saving data in another CRS? Like in ArcGIS?
Here is the similar question but answered differently, I don't want to create a new coordinate system, I want to check the transformation between existing in QGIS coordinate systems.
In ArcGIS I can select between several transformation methods for the pair of CRS, and what about QGIS?
I've changed the default WGS84 CRS to another local CRS. For example, if I set for the project EPSG 3763 (ETRS PT TM 06), described as
+proj=tmerc +lat_0=39.66825833333333 +lon_0=-8.133108333333334 +k=1 +x_0=0 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs, and add data in EPSG 20790 (Datum Lisboa)
+proj=tmerc +lat_0=39.66666666666666 +lon_0=1 +k=1 +x_0=200000 +y_0=300000 +ellps=intl +towgs84=-304.046,-60.576,103.64,0,0,0,0 +pm=lisbon +units=m +no_defs, it is reprojected on-the-fly and looks more or less correctly. But if I cannot see is it really correct I want to know the transformation used. There are several recommended methods of different accuracy, and I want to know which one was used (if it was one of them).
(I am not fluent in QGIS, just learning).