NGS Report

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NOAA’s National Geodetic Survey (NGS)

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NGS Report

  1. 1. NOAA’s National Geodetic Survey (NGS)<br />Report to<br />National States Geographic Information Council<br />October 2009, Cleveland, OH<br />John Ellingson, State Geodetic Advisor<br />
  2. 2. NGS MISSION<br /> To define, maintain and provide access to the National Spatial Reference System to meet our nation’s economic, social, and environmental needs.<br />
  3. 3. National Spatial Reference System“NSRS”<br />1,558,321 survey marks (stations) in the NGS database on 9/22/09- includes CORS stations<br />Foundation of all surveying, mapping, charting and positioning activities in the United States and Territories<br />
  4. 4. NAD83 (NSRS2007) adjustment<br />Properly aligns states<br />Tied to National CORS network<br />~68,000 stations used – <br />~284,000 GPS vectors used<br />****Final report released in April 2009****<br />NOAA Technical Report NOS NGS 60 NAD83 (NSRS2007)<br />http://www.ngs.noaa.gov/PUBS_LIB/NSRS2007/<br /> FinalReports.shtml <br />
  5. 5. New GEOID09 model released 9/22/09<br /> GEOID: The equipotential surface of the Earth’s gravity field which best fits global mean sea level.<br />Last NGS model for CONUS was published in 2003, (2006 for Alaska)<br />Better model because of (NSRS2007) readjustment<br />Better model because of additional data points.<br />
  6. 6. Control Used to Develop GEOID09<br />
  7. 7. National Geodetic Survey’s - CORSContinuously Operating Reference Stations<br />Network of GNSS receivers – only accepted by NGS after passing very detailed review<br />Coordinates of all CORS are computed daily by NGS and made available to the public by easily available charts, spreadsheets and data files.<br />Archived data is available from NGS website back to 1994<br />
  8. 8. NGS CORS Network<br />~1,300 stations in network – March 2009<br />Currently adding approximately 200 per year.<br />More than 200 organizations participate in CORS program.<br />
  9. 9.
  10. 10. Obtain CORS Observation Files From NGS<br />
  11. 11. Online Positioning Users Service“OPUS”<br />You submit your GPS observations to NGS <br />and OPUS computes the positions for you.<br />Several “flavors” of OPUS:<br />OPUS (the original)-<br />OPUS-RS-<br />OPUS DB-<br />OPUS Projects-<br />
  12. 12. Opus Submittal Page – NGS Website<br />
  13. 13. Gravity for the Redefinition of the American Vertical Datum = GRAV-D<br />10 year program to develop a more accurately defined Geoid for North America<br />New GRAV-D datum will replace NAVD88<br />Orthometric Heights (“elevations” on maps) good to 2 cm (or better) using GNSS technology<br />Gravity for the Nation benefits:<br /><ul><li> Imagery for the Nation
  14. 14. Lidar for the Nation
  15. 15. Elevation for the Nation</li></li></ul><li>GRAV-D Details<br />Typical flying height<br />is 35,000 feet. <br />Some missions flown as<br />low as 5,000 feet (rare)<br /> 10km x 40km blocks <br />Est. total cost &lt;$40 million, spread over 10 yrs <br />
  16. 16. WisconsinHeight ModernizationHoriz. & Vert. Control<br />Started 10 years ago-before GRAV-D program<br />$18 million to reach this point<br />Available right now….no waiting 8 years for the GRAV-D results<br />
  17. 17. What are NGS Products Worth to Society?January 2009 Socio-economic Scoping Study<br />$758 million- annual value of CORS network & OPUS<br />$282 million- estimated annual value of GRAV-D, if available today.<br />$2.4 billion- annual value of National Spatial Reference System (NSRS)<br />
  18. 18. NGS 10 Year Plan- <br /> Big Changes Ahead?<br />Visit the NGS website and view the current plan.<br />http://www.ngs.noaa.gov/INFO/tenyearfinal.shtml<br />
  19. 19. NGS- State Advisor Program<br />
  20. 20. Questions or Comments<br />www.ngs.noaa.gov<br />John Ellingson<br />John.ellingson@noaa.gov<br />608-516-1382<br />

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