Vertical Datum RS3 input for GPS·H tool


I’d like to convert between CGG2013a and CGVD28 HT2_2002 using the following NRCAN webtool: GPS·H

I see that emlid has 2013a options including 1997, 2002 and 2010.

Which one should I select to be consistent with the 2013a input on NRCAN?

Thanks in advance.

Hi David,

Did I understand correctly that you have the heights in CGVD28 (HT2_2002) and want to convert them to CGVD2013(CGG2013a) and compare them with those in Emlid Flow?

If so, please select CGVD2013(CGG2013a) in Emlid Flow.

One more thing: I noticed that you are using a Legacy CS from our registry. I suggest choosing the CS without the legacy tag. The easiest way to do this is to type in the country’s name when searching for the CS:

If you choose a CS with the legacy tag, you will see the EPSG code under the CS name.

Choosing the CS from our updated registry (without the legacy tag) will ensure that the points will be consistent with what you get from your country’s surveying transformation tool.

Thank you for the prompt response and helpful information.

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