AB_CSRS.DAC NTv2_0.gsb
Can be taken as an approximate transformation NAD27 to WGS 84 - see code 8585.
OGP
2020-01-31
Geodesy.
See CRS code 4267 for recommended coordinate axis representation for the human interface.
Ellipsoidal 2D CS. Axes: latitude, longitude. Orientations: north, east. UoM: dec deg