Share
VIDEOS 1 TO 50
North American Vertical Datum of 1988
North American Vertical Datum of 1988
Published: 2015/10/19
Channel: Audiopedia
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
What are Geodetic Datums?
What are Geodetic Datums?
Published: 2014/10/01
Channel: The COMET Program/MetEd
Elevation
Elevation
Published: 2012/08/29
Channel: USGS
BHALO RE BHALO    NAVD
BHALO RE BHALO NAVD
Published: 2012/09/07
Channel: IMAGE MANIA
North American Datum
North American Datum
Published: 2016/01/14
Channel: Audiopedia
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
Sabine Pass
Sabine Pass
Published: 2016/08/10
Channel: WikiWikiup
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
Northwest Ordinance
Northwest Ordinance
Published: 2015/10/19
Channel: Audiopedia
Navd zardy baynet bash
Navd zardy baynet bash
Published: 2017/07/04
Channel: kcha taqana
What Is the Status of Today
What Is the Status of Today's Geodetic Datums?
Published: 2014/10/01
Channel: The COMET Program/MetEd
NavD
NavD
Published: 2014/06/04
Channel: Navdeep Sharma
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
How were Geodetic Datums Established?
How were Geodetic Datums Established?
Published: 2015/08/25
Channel: usoceangov
Sea level
Sea level
Published: 2014/08/18
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
What's Next for Geodetic Datums?
Published: 2015/08/25
Channel: usoceangov
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
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
North American Datum HD
North American Datum HD
Published: 2016/03/17
Channel: Keith Patete
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
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
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
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
Mount  Whitney : Trail to the Summit
Mount Whitney : Trail to the Summit
Published: 2009/02/26
Channel: bouducon
Google Earth for educators: Visualising elevation
Google Earth for educators: Visualising elevation
Published: 2012/08/28
Channel: contoureducation
Elevation
Elevation
Published: 2014/10/10
Channel: Audiopedia
Part 2: Using GeoCalc Mode in Global Mapper
Part 2: Using GeoCalc Mode in Global Mapper
Published: 2015/07/31
Channel: BlueMarbleWebinars
Manhattan with 20.8 ft (NAVD88) of flooding
Manhattan with 20.8 ft (NAVD88) of flooding
Published: 2014/03/26
Channel: RPS ASA
Mount Whitney Summit of Mt. Whitney 14,505 FEET
Mount Whitney Summit of Mt. Whitney 14,505 FEET
Published: 2011/04/07
Channel: ProjectCarTV
All Data Centres Are Not The Same
All Data Centres Are Not The Same
Published: 2015/03/16
Channel: EurotechComputers
Fred Schnittker Geodetic Surveys
Fred Schnittker Geodetic Surveys
Published: 2013/04/06
Channel: Matt Schnittker
GEOG 1700 Lecture 5 - Topographic Maps
GEOG 1700 Lecture 5 - Topographic Maps
Published: 2015/08/05
Channel: Geospatial Administrator
North Uist
North Uist
Published: 2015/10/19
Channel: Audiopedia
Norwegian heavy water sabotage
Norwegian heavy water sabotage
Published: 2015/10/19
Channel: Audiopedia
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
GLONASS
GLONASS
Published: 2014/07/31
Channel: Audiopedia
North Korean abductions of Japanese citizens
North Korean abductions of Japanese citizens
Published: 2015/10/19
Channel: Audiopedia
Charles Anderson discovers dragonflies that cross oceans
Charles Anderson discovers dragonflies that cross oceans
Published: 2009/12/17
Channel: TED
Northeastern University
Northeastern University
Published: 2015/10/19
Channel: Audiopedia
The War on Drugs Is a Failure
The War on Drugs Is a Failure
Published: 2012/06/25
Channel: The Film Archives
Civil Liberties Under the Reagan Administration
Civil Liberties Under the Reagan Administration
Published: 2012/07/06
Channel: The Film Archives
NEXT
GO TO RESULTS [45 .. 94]

WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
Jump to: navigation, search

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.

See also[edit]

External links[edit]

Disclaimer

None of the audio/visual content is hosted on this site. All media is embedded from other sites such as GoogleVideo, Wikipedia, YouTube etc. Therefore, this site has no control over the copyright issues of the streaming media.

All issues concerning copyright violations should be aimed at the sites hosting the material. This site does not host any of the streaming media and the owner has not uploaded any of the material to the video hosting servers. Anyone can find the same content on Google Video or YouTube by themselves.

The owner of this site cannot know which documentaries are in public domain, which has been uploaded to e.g. YouTube by the owner and which has been uploaded without permission. The copyright owner must contact the source if he wants his material off the Internet completely.

Powered by YouTube
Wikipedia content is licensed under the GFDL and (CC) license