gov.noaa.nodc:0209231 eng utf8 dataset NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NOAA Contact Information Information for contacts at NCEI. information custodian 2025-05-16T15:45:06Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) GEOID18 Height and Estimated Uncertainty for GPS on Bench Marks dataset used to create GEOID18 (NCEI Accession 0209231) 2020-04-03 publication 2020-03-09 creation International DOI Foundation (IDF) 10.25921/d2rg-hv41 NOAA National Centers for Environmental Information gov.noaa.nodc:0209231 NCEI Archive Management System 0209231 NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information publisher Galen Scott NOAA National Ocean Service (NOS) resourceProvider US National Geodetic Survey (NGS) https://www.ngs.noaa.gov/ HTTPS US National Geodetic Survey (NGS) website Institution web page information resourceProvider Galen Scott National Geodetic Survey galen.scott@noaa.gov principalInvestigator Kevin Ahlgren National Geodetic Survey Kevin.Ahlgren@noaa.gov pointOfContact Brian Shaw National Geodetic Survey Brian.Shaw@noaa.gov collaborator Ahlgren, Kevin author Scott, Galen NOAA National Ocean Service (NOS) author Shaw, Brian author Zilkoski, David author Paudel, Nagendra author US National Geodetic Survey (NGS) https://www.ngs.noaa.gov/ HTTPS US National Geodetic Survey (NGS) website Institution web page information contributor tableDigital This file contains a list of geodetic bench marks, identified by a Permanent Identifier (PID), each of which have a precise orthometric height determined by geodetic leveling, a precise ellipsoid height determined by GPS surveying, and a precise modeled hybrid geoid height. The observations were used to constrain a gravimetric geoid model to the surface of a current vertical datum to produce a hybrid geoid model and associated performance metrics. The data is primarily from the US, however some data from Canada and Mexico is included as well. This file was compiled to support the National Geodetic Survey's GEOID18 project. completed historicalArchive NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information pointOfContact asNeeded https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:0209231 Preview graphic PNG 0209231 NCEI ACCESSION NUMBER 2020-03-24 publication GPS instrument NODC INSTRUMENT TYPES THESAURUS in situ model output satellite data theme NODC OBSERVATION TYPES THESAURUS US National Geodetic Survey dataCentre NODC COLLECTING INSTITUTION NAMES THESAURUS US National Geodetic Survey dataCentre NODC SUBMITTING INSTITUTION NAMES THESAURUS satelliteObservation theme WMO_CategoryCode 2012-09-15 publication DOC/NOAA/NOS/NGS > National Geodetic Survey, National Ocean Service, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian Designation Estimated_Uncertainty GEOID18_Height GEOID18_Residual Jackknife_Residual NAD83_2011_Ellipsoid_Height NAD83_2011_Latitude NAD83_2011_Longitude Orthometric_Height Permanent Identifiers (PID) Premodel_Residual Source State Used_In_Model Vertical_Datum theme Provider Keywords GPS RECEIVERS > GPS RECEIVERS instrument Global Change Master Directory (GCMD) Instrument Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian geodetic level model model residual instrument Provider Instruments Contiguous United States Puerto Rico U.S. Virgin Islands place Provider Place Names 8792K9 Send2NCEI Submission Package ID accessLevel: Public otherRestrictions Cite as: Ahlgren, Kevin; Scott, Galen; Shaw, Brian; Zilkoski, David; Paudel, Nagendra (2020). GEOID18 Height and Estimated Uncertainty for GPS on Bench Marks dataset used to create GEOID18 (NCEI Accession 0209231). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/d2rg-hv41. Accessed [date]. 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National Geodetic Survey 2020 publication https://www.ngs.noaa.gov/GPSonBM/index.shtml HTTPS National Geodetic Survey National Geodetic Survey Homepage information crossReference eng; USA utf8 environment elevation -130 -60 15 58 1900-01-01 2018-12-10 NOAA National Centers for Environmental Information +1-301-713-3277 ncei.info@noaa.gov pointOfContact In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media. Contact NCEI for other distribution options and instructions. Excel PNG 10.52 https://doi.org/10.25921/d2rg-hv41 HTTPS Web browser NCEI Dataset Landing Page Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/oas/209231 HTTPS Web browser Descriptive Information Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/download/209231 HTTPS Web browser HTTPS Navigate directly to the URL for data access and direct download. download ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0153/0209231/ FTP Any FTP client FTP These data are available through the File Transfer Protocol (FTP). FTP is no longer supported by most internet browsers. You may copy and paste the FTP link to the data into an FTP client (e.g., FileZilla or WinSCP). download dataset NCEI Accession 0209231 v1.1 was published. 2020-04-03T13:19:25Z NCEI Accession 0209231 v1.1 publication https://www.ncei.noaa.gov/archive/accession/0209231/1.1 HTTPS NCEI Accession 0209231 v1.1 published 2020-04-03T13:19:25Z download dataset Parameter or Variable: NAD83_2011_Longitude (measured); Units: decimal degrees; Observation Category: satellite; Sampling Instrument: GPS; Sampling and Analyzing Method: Geodetic Survey - Longitude in decimal degrees in 2011 realization of the North American Datum of 1983; Data Quality Method: processed in accordance with NGS' authoritative standards Parameter or Variable: NAD83_2011_Latitude (measured); Units: Decimal degrees; Observation Category: satellite; Sampling Instrument: GPS; Sampling and Analyzing Method: Geodetic Survey - Latitude in decimal degrees in 2011 realization of the North American Datum of 1983; Data Quality Method: processed in accordance with NGS' authoritative standards Parameter or Variable: NAD83_2011_Ellipsoid_Height (measured); Units: meter; Observation Category: satellite; Sampling Instrument: GPS; Sampling and Analyzing Method: geodetic Survey - Ellipsoid height in meters in 2011 realization of the North American Datum of 1983; Data Quality Method: processed in accordance with NGS' authoritative standards Parameter or Variable: Orthometric_Height (measured); Units: meter; Observation Category: in situ; Sampling Instrument: geodetic level; Sampling and Analyzing Method: geodetic leveling survey - Orthometric Height of bench mark in meters; Data Quality Method: processed in accordance with NGS' authoritative standards Parameter or Variable: Premodel_Residual (calculated); Units: meter; Observation Category: other; Sampling Instrument: model residual; Sampling and Analyzing Method: PreModel residual in [m] with respect to xGEOID19B. Bias and tilt removed. (See Section 6.1.2 in GEOID18 - NOAA Technical Report NOS NGS 72) Parameter or Variable: Jackknife_Residual (calculated); Units: meter; Observation Category: other; Sampling Instrument: model residual; Sampling and Analyzing Method: Jackknife (leave-one-out) residual in [m]. Only available for marks USED in the geoid modeling. (See Section 5.3.1 in GEOID18 NOAA Technical Report NOS NGS 72) Parameter or Variable: GEOID18_Residual (calculated); Units: meter; Observation Category: other; Sampling Instrument: model residual; Sampling and Analyzing Method: PostModel residual in [m] with respect to GEOID18. (See Section 7.1 in GEOID18 NOAA Technical Report NOS NGS 72) Parameter or Variable: GEOID18_Height (calculated); Units: meter; Observation Category: model output; Sampling Instrument: model; Sampling and Analyzing Method: GEOID18 height in [m]. Parameter or Variable: Estimated_Uncertainty (calculated); Units: meter; Observation Category: model output; Sampling Instrument: model; Sampling and Analyzing Method: GEOID18 height uncertainty at 1-sigma level in [m]. (See Section 6.2 in GEOID18 NOAA Technical Report NOS NGS 72) asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian GPS GPS Global Positioning System receiver satellite-based instrument used for geo-location, positioning and navigation