CGG2013a is the new default geoid

Help for GPS·H

GPS·H allows the conversion of GNSS ellipsoidal heights h, that are either in NAD83(CSRS) or ITRF, to orthometric heights H (heights above mean sea level) through the application of a gravimetric or hybrid geoid model. The application allows also the reversed conversion (H to h), and the conversion between two vertical datums Ha to Hb)(e.g., CGVD28(HT2_0) to CGVD2013(CGG2013a)). When applying the Canadian Gravimetric Geoid model CGG2013a, the orthometric heights are directly integrated into the Canadian Geodetic Vertical Datum of 2013 (CGVD2013). On the other hand, the Height Transformation v.2.0 (HTv2.0) provides heights compatible with the Canadian Geodetic vertical Datum of 1928 (CGVD28) when the ellipsoidal heights are at epoch 1997.0. The other geoid models do not convert to either CGVD2013 or CGVD28, but to their own reference system.

The on-line version accepts the following types of input coordinates: geographic, Cartesian and UTM/MTM/Stereographic. By clicking the "Batch Processing" box, you can submit coordinates in a file. The "Input H" box is for the reversed conversion (H to h).

View documentation for GPS·H

Batch Processing

Single Calculation



h (metres)
N (metres)
H (metres)
Gravity (mGal)
Hd (metres)
H28 (meters)
dH (meters)
H2013 (meters)
H2013 (meters)
dH (meters)
H28 (meters)

Use of Canadian Geodetic Survey products and data is subject to the Open Government Licence - Canada

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