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North American Vertical Datum of 1988
North American Vertical Datum of 1988
Published: 2015/10/19
Channel: Audiopedia
Elevation
Elevation
Published: 2012/08/29
Channel: USGS
Vertical Datums by Dave Doyle
Vertical Datums by Dave Doyle
Published: 2017/07/25
Channel: Geospatial Users Group
NOAA’s VDatum: Transforming Heights between Vertical Datums
NOAA’s VDatum: Transforming Heights between Vertical Datums
Published: 2016/09/28
Channel: The COMET Program/MetEd
BHALO RE BHALO    NAVD
BHALO RE BHALO NAVD
Published: 2012/09/07
Channel: IMAGE MANIA
Vertical Datum Upgrade
Vertical Datum Upgrade
Published: 2017/11/13
Channel: WaterMattersTV
Juliana Blackwell: The 2022 new datums, or more properly, the 2022 Reference Frames
Juliana Blackwell: The 2022 new datums, or more properly, the 2022 Reference Frames
Published: 2015/05/06
Channel: National Society of Professional Surveyors NSPS
Feliz Navd with Fam
Feliz Navd with Fam
Published: 2015/12/25
Channel: Santiago Hernandez
Sea Level Datum of 1929
Sea Level Datum of 1929
Published: 2015/12/07
Channel: Audiopedia
Determinacion geopotencial local del datum vertical en la superficie
Determinacion geopotencial local del datum vertical en la superficie
Published: 2014/05/28
Channel: rolas soria
What are Geodetic Datums?
What are Geodetic Datums?
Published: 2014/10/01
Channel: The COMET Program/MetEd
How Were Geodetic Datums Established?
How Were Geodetic Datums Established?
Published: 2014/10/01
Channel: The COMET Program/MetEd
North American Datum
North American Datum
Published: 2016/01/14
Channel: Audiopedia
Ellipsoid vs. Orthometric Elevations; Why is my GPS reporting an elevation 60 feet too low?
Ellipsoid vs. Orthometric Elevations; Why is my GPS reporting an elevation 60 feet too low?
Published: 2012/09/27
Channel: Mark Silver
What Is the Status of Today
What Is the Status of Today's Geodetic Datums?
Published: 2014/10/01
Channel: The COMET Program/MetEd
Fundamentals of Geodesy 6   Vertical Datums & Geoid Models 1 Preview
Fundamentals of Geodesy 6 Vertical Datums & Geoid Models 1 Preview
Published: 2014/11/14
Channel: GeoLearn
Sea level
Sea level
Published: 2014/08/18
Channel: Audiopedia
Elevation
Elevation
Published: 2014/10/10
Channel: Audiopedia
Fred Schnittker Geodetic Surveys
Fred Schnittker Geodetic Surveys
Published: 2013/04/06
Channel: Matt Schnittker
What
What's Next for Geodetic Datums?
Published: 2014/10/01
Channel: The COMET Program/MetEd
Sabine Pass
Sabine Pass
Published: 2016/08/10
Channel: WikiWikiup
Antietam Creek Burnside Stone Arch Bridge Built in 1832
Antietam Creek Burnside Stone Arch Bridge Built in 1832
Published: 2014/03/03
Channel: Water Advocacy
CUT - Celestia Lab: Establishing a local Vertical Datum (Part 1)
CUT - Celestia Lab: Establishing a local Vertical Datum (Part 1)
Published: 2016/02/28
Channel: Chris Danezis
What is sea level rise? | Ocean Wise
What is sea level rise? | Ocean Wise
Published: 2017/11/17
Channel: Ocean Wise
Mount  Whitney : Trail to the Summit
Mount Whitney : Trail to the Summit
Published: 2009/02/26
Channel: bouducon
Antietam Creek Flow Gauging Station - 100 Yds Downstream from Burnside Bridge
Antietam Creek Flow Gauging Station - 100 Yds Downstream from Burnside Bridge
Published: 2015/04/22
Channel: Water Advocacy
DOCUMENTALES DE CIENCIA 👍 LA FALLA DE SAN ANDRES,TERREMOTOS,BEST DOCUMENTARIES,DISCOVERY,DOCUMENTAL
DOCUMENTALES DE CIENCIA 👍 LA FALLA DE SAN ANDRES,TERREMOTOS,BEST DOCUMENTARIES,DISCOVERY,DOCUMENTAL
Published: 2017/04/01
Channel: DocuMentales COMPLETOS EN ESPAÑOL
How to switch vertical datum? 怎样转换垂直基准?
How to switch vertical datum? 怎样转换垂直基准?
Published: 2013/10/02
Channel: Land Surveying Mapping Tools in AutoCAD
Open Flow Channel Federal Guaging Station - Paw Paw, West Virginia
Open Flow Channel Federal Guaging Station - Paw Paw, West Virginia
Published: 2015/11/25
Channel: Water Advocacy
Mount Whitney Summit of Mt. Whitney 14,505 FEET
Mount Whitney Summit of Mt. Whitney 14,505 FEET
Published: 2011/04/07
Channel: ProjectCarTV
HYPACK: Geodesy - State Plane NAD-83 and NAD-27
HYPACK: Geodesy - State Plane NAD-83 and NAD-27
Published: 2015/03/16
Channel: HYPACK Video
Google Earth for educators: Visualising elevation
Google Earth for educators: Visualising elevation
Published: 2012/08/28
Channel: contoureducation
All Data Centres Are Not The Same
All Data Centres Are Not The Same
Published: 2015/03/16
Channel: EurotechComputers
North American Datum HD
North American Datum HD
Published: 2016/03/17
Channel: Keith Patete
Manhattan with 20.8 ft (NAVD88) of flooding
Manhattan with 20.8 ft (NAVD88) of flooding
Published: 2014/03/26
Channel: RPS ASA
Ev Cochrane: Planetary Catastrophe, Ancient Myths & Modern Science | EU2015
Ev Cochrane: Planetary Catastrophe, Ancient Myths & Modern Science | EU2015
Published: 2016/02/16
Channel: ThunderboltsProject
Part 2: Using GeoCalc Mode in Global Mapper
Part 2: Using GeoCalc Mode in Global Mapper
Published: 2015/07/31
Channel: BlueMarbleWebinars
D1S6 Dave Zilkoski Guidelines for establishing GPS derived orthometric heights
D1S6 Dave Zilkoski Guidelines for establishing GPS derived orthometric heights
Published: 2011/10/31
Channel: LSU Center for GeoInformatics
SIMULACRO DATUM 2das Vueltas Abril: KEIKO FUJIMORI GANARIA a PPK, MENDOZA y BARNECHEA
SIMULACRO DATUM 2das Vueltas Abril: KEIKO FUJIMORI GANARIA a PPK, MENDOZA y BARNECHEA
Published: 2016/04/08
Channel: picanteperu
The Anatomy of a Great Deception - Global Master Edition (2014) (Subs 14 Languages)
The Anatomy of a Great Deception - Global Master Edition (2014) (Subs 14 Languages)
Published: 2016/12/28
Channel: Divide Impera
Civil Liberties Under the Reagan Administration
Civil Liberties Under the Reagan Administration
Published: 2012/07/06
Channel: The Film Archives
The War on Drugs Is a Failure
The War on Drugs Is a Failure
Published: 2012/06/25
Channel: The Film Archives
Charles Anderson discovers dragonflies that cross oceans
Charles Anderson discovers dragonflies that cross oceans
Published: 2009/12/17
Channel: TED
GEOG 1700 Lecture 5 - Topographic Maps
GEOG 1700 Lecture 5 - Topographic Maps
Published: 2015/08/05
Channel: Geospatial Administrator
GLONASS
GLONASS
Published: 2014/07/31
Channel: Audiopedia
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WIKIPEDIA ARTICLE

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The North American Vertical Datum of 1988 (NAVD 88) is the vertical control datum of orthometric height established for vertical control surveying in the United States of America based upon the General Adjustment of the North American Datum of 1988.

NAVD 88 was established in 1991 by the minimum-constraint adjustment of geodetic leveling observations in Canada, the United States, and Mexico. It held fixed the height of the primary tidal bench mark, referenced to the International Great Lakes Datum of 1985 local mean sea level height value, at Rimouski, Quebec, Canada. Additional tidal bench mark elevations were not used due to the demonstrated variations in sea surface topography, i.e., that mean sea level is not the same equipotential surface at all tidal bench marks.

The definition of NAVD 88 uses the Helmert orthometric height, which calculates the location of the geoid (which approximates sea level) from modeled local gravity. The NAVD 88 model is based on then-available measurements, and remains fixed despite later improved geoid models.

NAVD 88 replaced the National Geodetic Vertical Datum of 1929 (NGVD 29), previously known as the Sea Level Datum of 1929. The elevation difference between points in a local area will show negligible change from one datum to the other, even though the elevation of both does change. NGVD 29 used a simple model of gravity based on latitude to calculate the geoid and did not take into account other variations. Thus, the elevation difference for points across the country does change between datums.

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External links[edit]

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