National Geodetic Vertical Datum of 1929

E859786
United States vertical reference system geodetic reference system vertical datum

The National Geodetic Vertical Datum of 1929 is an older United States vertical reference system used to define elevations above sea level before being superseded by NAVD 88.

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Observed surface forms (1)

Surface form Occurrences
NGVD 88 1

Statements (49)

Predicate Object
instanceOf United States vertical reference system ⓘ
geodetic reference system ⓘ
vertical datum ⓘ
abbreviation NGVD 29 NERFINISHED ⓘ
alsoKnownAs NGVD29 NERFINISHED ⓘ
National Geodetic Vertical Datum of 1929 (NGVD 29) NERFINISHED ⓘ
appliesToRegion Alaska NERFINISHED ⓘ
Canada (limited use) NERFINISHED ⓘ
Mexico (limited use) ⓘ
conterminous United States NERFINISHED ⓘ
basedOn mean sea level observations at 26 tide gauges in the United States and Canada ⓘ
coordinateSystemType vertical reference system ⓘ
country United States of America ⓘ
surface form: United States
datumType orthometric height datum ⓘ
definedBy network of geodetic leveling observations ⓘ
differenceFrom NAVD 88 has spatially varying offsets relative to NGVD 29 ⓘ
documentationBy NOAA National Geodetic Survey NERFINISHED ⓘ
National Oceanic and Atmospheric Administration NERFINISHED ⓘ
epoch 1929 ⓘ
establishedBy National Geodetic Survey NERFINISHED ⓘ
U.S. Coast and Geodetic Survey NERFINISHED ⓘ
establishedIn 1929 ⓘ
formerName Sea Level Datum of 1929 NERFINISHED ⓘ
hasIssue did not account for later improvements in gravity data ⓘ
inconsistencies in mean sea level between tide gauges ⓘ
heightType orthometric height ⓘ
maintainedBy National Geodetic Survey NERFINISHED ⓘ
partOf National Spatial Reference System NERFINISHED ⓘ
reasonForReplacement need for a more accurate and consistent vertical datum ⓘ
referenceSurface mean sea level as determined in 1929 ⓘ
referenceTo tide gauge observations at multiple tide stations ⓘ
relatedTo North American Datum of 1927 NERFINISHED ⓘ
replacedInPracticeBy NAVD 88 NERFINISHED ⓘ
status superseded ⓘ
supersededBy NAVD 88 NERFINISHED ⓘ
North American Vertical Datum of 1988 NERFINISHED ⓘ
unitOfMeasure foot ⓘ
meter ⓘ
usedBy cartographers ⓘ
civil engineers ⓘ
federal agencies in the United States ⓘ
state and local governments in the United States ⓘ
surveyors ⓘ
usedFor defining elevations above mean sea level ⓘ
usedIn engineering surveys ⓘ
floodplain mapping ⓘ
hydrologic studies ⓘ
topographic mapping ⓘ
usedUntil late 20th century ⓘ

Referenced by (4)

Full triples — surface form annotated when it differs from this entity's canonical label.

NAVD 88 → replaced → National Geodetic Vertical Datum of 1929 ⓘ
NAVD 88 → alsoKnownAs → National Geodetic Vertical Datum of 1929 ⓘ
this entity surface form: NGVD 88
North American Vertical Datum of 1988 → replaced → National Geodetic Vertical Datum of 1929 ⓘ
North American Vertical Datum of 1988 → isSuccessorOf → National Geodetic Vertical Datum of 1929 ⓘ