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I have water level data for the Toronto Harbour that states, "74.200 metres above IGLD 1985"

I also have land elevation data around Toronto that uses the Geodetic Vertical Datum of 1928 (CGVD28)

To relate the two datasets I assume I need both sets of data using the same vertical datum.

How do I convert IGLD85 to CGVD28 for the area around the Toronto Harbour?

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I just needed to find a benchmark in my geographic region of interest that had both of my vertical datums. That info is found here.

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