Werner Thie <[email protected]> writes: > OHT SYST MODEL HEIGHT OHT CGVD2013 CGG2013a 362.7005 What's your take?
That's CGVD2013, which is a "modernized" vertical datum. CGG2013a is a gravity model. See: https://cgrsc.ca/resources/geodetic-control-networks/vertical-control-networks/ and in particular CGVD2013 elevations are with respect to an equipotential surface that conventionally represents coastal mean sea level around North America, and is realized by the Canadian Gravimetric Geoid model of 2013 (CGG2013). The CGG2013 geoid heights provide the separation between GNSS ellipsoidal heights (GRS80) in NAD83(CSRS) and the CGVD2013 mean sea level. Therefore these heights are not "WGS84 orthometric height" as realized by WGS84 HAE and EGM2008. Further links: https://ostrnrcan-dostrncan.canada.ca/entities/publication/6aa36fa1-e6bb-4cfd-ab44-13ee974caeda https://cdnsciencepub.com/doi/10.5623/cig2016-101
