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Overview of Continuously Operating Reference Stations (CORS) by NOAA's National Geodetic Survey

The Continuously Operating Reference Stations (CORS) network, managed by NOAA's National Geodetic Survey, comprises over 1,900 GPS/GNSS stations across the United States and beyond. This multi-purpose network serves various applications, including geodesy, surveying, meteorology, and monitoring. CORS provides essential data products such as GNSS reference frames and antennas calibration, contributing $1.2 billion in economic benefits to the U.S. as of 2012. The CORS network involves collaboration from federal, state, academic, and private partners, enhancing its impact on multiple domains.

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Overview of Continuously Operating Reference Stations (CORS) by NOAA's National Geodetic Survey

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  1. Continuously Operating Reference Stations (CORS) Neil D. Weston National Geodetic Survey, NOS, NOAA

  2. Outline • Introduction • Continuously Operating Reference Stations • Network • Applications • Products • Selection Criteria • Business Model

  3. Introduction - CORS • CORS – Nationwide network of GPS/GNSS receivers – 1900+ stations • Multi-purpose, cooperative endeavor • Federal – NOAA, Federal Aviation Administration • State – Departments of Transportation • Academic – Universities • Others – Private • 226 partners • $1.2 Billion in economic benefits for USA -2012

  4. CORS Network

  5. Stations on Four Continents

  6. CORS Applications Geodesy / Surveying / Hydrography Meteorology / Space Weather Geophysical applications / Monitoring Geographic Information Systems (GIS/LIS) Mining / Forestry Interference Detection

  7. CORS Products and Activities GNSS (GPS + GLONASS) – Data Reference Frames and Coordinates Station Metadata Online Positioning User Service (OPUS) Antenna Calibration Geoid Modeling Remote Sensing / Photogrammetry Surveying Orbit Production

  8. Antenna Calibrations • Absolute Antenna Calibrations • For use with IGS08, epoch 2005.00 • For use with NAD 83 (2011, MA11, PA11) epoch 2010.00 • Relative Antenna Calibrations • For use with ITRF00, epoch 1997.00 • For use with NAD 83 (CORS96, PACP00, MARP00) epoch 2002.00

  9. GPS Orbits • Ultra-rapid (iguWWWWD.sp3) • 6 hour latency, 24 hour file, sp3 format • Rapid (igrWWWWD.sp3) • 13 hour latency, 24 hour file, sp3 format • Final (igsWWWWD.sp3) • 12 to 14 day latency, 24 hour file, sp3 format

  10. CORS Selection Criteria 70 Km Spacing • Meet and support NOAA mission • Higher density sites – excessive redundancy • NOAA and other federal agency needs • Data quality of nearby CORS • Equipment – receivers and antennas • Collection rate • GNSS / GPS – observations available

  11. Business Model Executive and Agency Summary Continuously Operating Reference Stations (CORS) CORS Products and Services Market Analysis Operational Components Management and Organization Costs and Associated CORS Activities Geodetic Resources External Dependencies

  12. CORS Statistics Data Type 2012 2013 CORS FTP 44,774,666 41,276,983 UFCORS 1,212,604 1,263,519 OPUS 286,599 232,591 OPUS-RS 136,450 129,218

  13. OPUS-RS Accuracy

  14. OPUS-RS Accuracy

  15. OPUS-RS Accuracy

  16. OPUS-RS Accuracy

  17. Thank YouDr. Neil D. Westonneil.d.weston@noaa.gov+1 301-713-3169

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