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Foundation CORS: Underpinning a New Positioning Framework

Foundation CORS: Underpinning a New Positioning Framework. Daniel Roman and Kevin Choi. Outline. Foundation CORS (FCORS) Improve multi-GNSS coverage in North America More IGS station options for future ITRF modeling Provides more control to Reprocessing of CORS New Reference Frames in 2022

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Foundation CORS: Underpinning a New Positioning Framework

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  1. Foundation CORS: Underpinning a New Positioning Framework Daniel Roman and Kevin Choi

  2. Outline • Foundation CORS (FCORS) • Improve multi-GNSS coverage in North America • More IGS station options for future ITRF modeling • Provides more control to Reprocessing of CORS • New Reference Frames in 2022 • Four total tied to ITRF model • EPP & IFVM • Positions tied to GNSS and not passive control Joint Assembly of IAG-IASPEI in Kobe, Japan JUly 30 - August 4, 2017

  3. Historic Reference Frame Sites on the North American Plate Joint Assembly of IAG-IASPEI in Kobe, Japan JUly 30 - August 4, 2017

  4. Joint Assembly of IAG-IASPEI in Kobe, Japan JUly 30 - August 4, 2017

  5. Reference Frame Station Requirements • Geographic Distribution • Surroundings • Geologic/Tectonic Monumentation • Site Survey • Operation • Instrumentation • Co-location • Metadata/Analysis Joint Assembly of IAG-IASPEI in Kobe, Japan JUly 30 - August 4, 2017

  6. Current Status and Future Plans BRSG FLF1 Joint Assembly of IAG-IASPEI in Kobe, Japan JUly 30 - August 4, 2017

  7. FCORS • Additional options for future ITRF models • Select sites to maximize coverage and co-location • Consideration for global coverage and US needs • More ties to regional (SIRGAS) & global frames (UN-GGRF) • Control for reprocessed CORS coordinates • QA/QC of CORS in OPUS-Net • Uses IGS stations (FCORS) to evaluate CORS • CORS/FCORS then provide access to Frames Joint Assembly of IAG-IASPEI in Kobe, Japan JUly 30 - August 4, 2017

  8. New US Frames in 2022 • Will be tied to most recent ITRF • Epoch date TBD – likely 2020.0 • Four Frames: North America, Pacific, Caribbean, and Mariana • At epoch date, all frames identical to ITRF • Then each frame rotates about an Euler pole • Velocity models describe motion in frame • Access to the four frames via OPUS tool • Versioning of coordinates based on models Joint Assembly of IAG-IASPEI in Kobe, Japan JUly 30 - August 4, 2017

  9. NSRS Modernization: Four New Frames The New: The North American Terrestrial Reference Frame of 2022 (NATRF2022) The Caribbean Terrestrial Reference Frame of 2022 (CATRF2022) The Pacific Terrestrial Reference Frame of 2022 (PATRF2022) The Mariana Terrestrial Reference Frame of 2022 (MATRF2022) The Old: NAD 83(2011) NAD 83(PA11) NAD 83(MA11) Joint Assembly of IAG-IASPEI in Kobe, Japan JUly 30 - August 4, 2017

  10. Four Frames/Plates in 2022 NATRF2022 MATRF2022 CATRF2022 PATRF2022 Image from Snay 2003 Joint Assembly of IAG-IASPEI in Kobe, Japan JUly 30 - August 4, 2017

  11. Replacing the NAD 83’s • Three plate-(pseudo)fixed frames will be replaced with fourplate-fixed reference frames • N. Amer., Pacific, Mariana, Caribbean(new!) • Remove long-standing non-geocentricity of NAD 83 frames • All four : identical to ITRFxx at a TBD epoch • 2020.00? • All four : differ from ITRFxx by plate rotation only • Updated Euler Pole determination for rigid plate only Joint Assembly of IAG-IASPEI in Kobe, Japan JUly 30 - August 4, 2017

  12. Each frame will • get 3 Euler Pole Parameters (EPP) • Euler Pole Latitude • Euler Pole Longitude • Rotation rate (rad/yr) • Used to compute • time-dependent TRF2022 • coordinates from time-dependent ITRF coordinates. Joint Assembly of IAG-IASPEI in Kobe, Japan JUly 30 - August 4, 2017

  13. Intra-Frame Velocity Model • Euler pole rotation accounts for motion in “stable” areas • Remaining motion accounted for with IFVM • This is still very much “TBD” • Simple case is gridding CORS and other c-GNSS • Could be a complicated geophysical model • Will account for 3D time varying motions • Could apply across plate-boundary (e.g., California) Joint Assembly of IAG-IASPEI in Kobe, Japan JUly 30 - August 4, 2017

  14. Discussion and Summary • Foundation CORS (FCORS) • More stations available to IGS for choice • Used to adjust the broader CORS Network • Provides better ties to regional and global models • New Frames to be established in 2022 • Four ITRF-based frames • Euler pole parameters define plate motion • Intra-Frame Velocity Models describe remaining motion in a frame Joint Assembly of IAG-IASPEI in Kobe, Japan JUly 30 - August 4, 2017

  15. Questions? Daniel R. Roman Chief Geodesist National Geodetic Survey Joint Assembly of IAG-IASPEI in Kobe, Japan JUly 30 - August 4, 2017

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