Vertical datum conversion12/25/2022 Technological advancements have created the ability for greater accuracy, resulting in the North American Vertical Datum of 1988 (NAVD 88). Satellite technology has also discovered ground elevations that have risen or fallen due to geological activity and the effects of gravity. Because mean sea level at one location can be quite different than mean sea level at another location, it is not an accurate benchmark for measurement. Originally called the Sea Level Datum of 1929, it was created for vertical control surveying in the United States, and is what is referred to by the inaccurate term “sea-level.” The sea itself is not level, but is subject to variations caused by currents, wind, barometric pressures, temperature, and the topography of the sea floor. NGVD 29 has been the benchmark used by surveyors and engineers as the standard position from which measurements are taken. Great Sacandaga Gauge Station at ConklingvilleĬonsistent with the USGS planned conversion from National Geodetic Vertical Datum of 1929 (NGVD29) to the North American Vertical Datum of 1988 (NAVD88), the Hudson River – Black River Regulating District will be upgrading the datum used to record water level elevation at all of its reservoirs.Įffective Februthe datum at surface-water and ground-water stations operated by the Hudson River – Black River Regulating District in partnership with the USGS will be converted from the National Geodetic Vertical Datum of 1929 (NGVD 29) to the North American Vertical Datum of 1988 (NAVD 88).
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