Published on October 9, 2009
NOAA’s National Geodetic Survey (NGS)
National States Geographic Information Council
October 2009, Cleveland, OH
John Ellingson, State Geodetic Advisor
NGS MISSION To define, maintain and provide access to the National Spatial Reference System to meet our nation’s economic, social, and environmental needs.
National Spatial Reference System“NSRS” 1,558,321 survey marks (stations) in the NGS database on 9/22/09- includes CORS stations Foundation of all surveying, mapping, charting and positioning activities in the United States and Territories
NAD83 (NSRS2007) adjustment Properly aligns states Tied to National CORS network ~68,000 stations used – ~284,000 GPS vectors used ****Final report released in April 2009**** NOAA Technical Report NOS NGS 60 NAD83 (NSRS2007) http://www.ngs.noaa.gov/PUBS_LIB/NSRS2007/ FinalReports.shtml
New GEOID09 model released 9/22/09 GEOID: The equipotential surface of the Earth’s gravity field which best fits global mean sea level. Last NGS model for CONUS was published in 2003, (2006 for Alaska) Better model because of (NSRS2007) readjustment Better model because of additional data points.
Control Used to Develop GEOID09
National Geodetic Survey’s - CORSContinuously Operating Reference Stations Network of GNSS receivers – only accepted by NGS after passing very detailed review Coordinates of all CORS are computed daily by NGS and made available to the public by easily available charts, spreadsheets and data files. Archived data is available from NGS website back to 1994
NGS CORS Network ~1,300 stations in network – March 2009 Currently adding approximately 200 per year. More than 200 organizations participate in CORS program.
Obtain CORS Observation Files From NGS
Online Positioning Users Service“OPUS” You submit your GPS observations to NGS and OPUS computes the positions for you. Several “flavors” of OPUS: OPUS (the original)- OPUS-RS- OPUS DB- OPUS Projects-
Opus Submittal Page – NGS Website
Gravity for the Redefinition of the American Vertical Datum = GRAV-D 10 year program to develop a more accurately defined Geoid for North America New GRAV-D datum will replace NAVD88 Orthometric Heights (“elevations” on maps) good to 2 cm (or better) using GNSS technology Gravity for the Nation benefits: Imagery for the NationLidar for the Nation Elevation for the Nation
Imagery for the Nation
Lidar for the Nation
Elevation for the Nation
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