OHDF: Orthometric Height Difference Conventional ObservationsMitch PalmerNovember 27, 2019geolab2020, geolab, record, observation, orthometric, height, difference
EHDF: Ellipsoidal Height Difference Conventional ObservationsMitch PalmerNovember 27, 2019geolab2020, geolab, record, observation, ellipsoid, height, difference
