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FEMA’S
Response to NAVD 88
Local Mean Sea Level (LMSL)
›determined at individual tide gages
Sea Level Datum (SLD) of 1929
›constrained at 26 tide gages in the U.S.
and Canada
National Geodetic Vertical Datum of 1929 (NGVD 29)
›renamed from SLD of 1929 to avoid confusion with LMSL
North American Vertical Datum of 1988 (NAVD 88)
›constrained only at Pointe au Pere gage on St. Lawrence River
