National Geodetic Vertical Datum (NGVD) 3
National Geodetic Vertical Datum (NGVD) 3 :
The National Geodetic Vertical Datum of 1929, the national datum used by the NFIP. It is based on mean sea level and was formerly known as 'Mean Sea Level datum of 1929 (MSL). NGVD is being replaced by NAVD, North American Vertical Datum
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