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Real Time Reference Networks in the U.S.

Learn about the National Geodetic Survey’s role in maintaining the NSRS, common referencing datums, and planned updates. Discover real-time network coverage and crucial guidelines.

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Real Time Reference Networks in the U.S.

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  1. Real Time Reference Networks in the U.S. Pam Fromhertz Rocky Mountain Regional National Geodetic Survey Advisor pamela.fromhertz@noaa.gov 240-988-6363 geodesy.noaa.gov

  2. NGS Advisors Other NGS offices geodesy.noaa.gov

  3. National Geodetic Survey’s role • Guidelines for Real-time GNSS Networks version 2.2, 2013 NGSGuidelinesForRealTimeGNSSNetworks geodesy.noaa.gov

  4. National Geodetic Survey’s role • Guidelines for Single Base Real Time GNSS Positioning, ver 3.1, 2014 UserGuidelinesForSingleBaseRealTimeGNSSPositioning geodesy.noaa.gov

  5. National Geodetic Survey’s role • Guidelines for Real-time GNSS Networks • Guidelines for Single base Real time GNSS Positioning • Network validation service to align RTNs with NGS’ National Spatial Reference System. geodesy.noaa.gov

  6. National Geodetic Survey Mission To define, maintain and provide access to the National Spatial Reference System (NSRS) to meet our Nation’s economic, social, and environmental needs. ……………………………………………......................... The NSRSis a consistent coordinate system that defines latitude, longitude, height, scale, gravity, orientation, and shoreline throughout the United States. geodesy.noaa.gov

  7. Role of National Spatial Reference System (NSRS) • Geodetic control provides a common reference system for establishing coordinates for all geographic data. • All NSDI framework data and users' applications data require geodetic control to accurately register spatial data. • The National Spatial Reference System is the fundamental geodetic control for the United States. • A geodetic datum is an abstract coordinate system with a reference surface (such as sea level) that serves to provide known locations to begin surveys and create maps. NSRS

  8. Common Referencing Datum in U.S. • Official horizontal datum for U.S. NAD83(2011) • Official vertical orthometric datum for U.S. NAVD88 (GEOID12B) • Others used WGS84, IGS08, ITRF08 • Historical NAD27, HARN, WGS84(1986), NGVD29 geodesy.noaa.gov

  9. New NSRS Reference Frames/Datums Planned for 2022 • Replace NAD83 with a geocentric reference frame • GNSS based • Replace NAVD88 with a gravity based geoid • Changes in feet (in Rocky Mountains)

  10. Puget Sound, WA Example of using the wrong Vertical References Approximately 80 meter offsets geodesy.noaa.gov

  11. NCATNGS Coordinate Conversion and Transformation Tool geodesy.noaa.gov

  12. Continuously Operating Reference Stations (CORS) CORS are now basis of NSRS geodesy.noaa.gov

  13. Continuously Operating Reference Stations (CORS) CORS are now basis of NSRS geodesy.noaa.gov

  14. U.S. Real Time Network Coverage geodesy.noaa.gov

  15. Real Time Reference Networks in the U.S.Highlights • 17 RTNs run by state DOT: • AZ’s RTN run by AZ State Catorgraphers’ Office • Mesa County, Colorado has RTN connecting with UT • WA WSRN is a cooperative network of more than 80 partners • The North American Reference Network Operators (NARNO) is a group that address issues • Plate Boundary Observatory provides correctors geodesy.noaa.gov

  16. Operational CORS (~1700)with 70km-buffer geodesy.noaa.gov

  17. NOAA’s National Geodetic Survey Thank you Pam Fromhertz Pamela.Fromhertz@noaa.gov 240-988-6363 geodesy.noaa.gov Pam nor NGS endorses any manufacturer

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