ON27CSv1.GSB
Derived through NAD83(CSRS)v3 but within accuracy of transformation may be assumed to apply to any version. For Toronto use NAD27 to NAD83(CSRS) (6) (CT code 9108).
Land Information Ontario via ISO Geodetic Register.
2019-07-15
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