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Aspects of the Intra-Frame Velocity (Deformation) Models for the U.S. N.S.R.S

Comprehensive insights into the evolution of geodetic reference frames, with discussions on the US N.S.R.S and the need for change towards NAPGD 2022. Includes details on CORS, IFVM modeling, and strategic plans for enhancing geodetic coordinates. Presented at the GeoPrevi 2018 International Symposium in Bucharest, Romania.

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Aspects of the Intra-Frame Velocity (Deformation) Models for the U.S. N.S.R.S

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  1. Aspects of the Intra-Frame Velocity (Deformation) Models for the U.S. N.S.R.S Daniel R. Roman, Ph.D. Chief Geodesist NOAA’s National Geodetic Survey

  2. Outline • Existing National Spatial Reference System • The Need for Change • Starting Point: a Densified-ITRF • The four TRF’s • NAPGD 2022 • Surveying post-2022 • Summary GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  3. Existing U.S. N.S.R.S. North American Datum of 1983 (NAD 83) North American Vertical Datum of 1988 (NAVD 88) Helmert Orthometric Heights 500,000 passive control marks Tied at one point in Canada Adjustment in geopotential numbers U.S., Canada and Mexico However, only U.S. adopted Interpolates static gravity field Produces consistent heights • “Static” Reference Frame • 80,000 passive control marks • U.S.: NAD 83 (2011/PA11/MA11) • Canada: NAD83 (CSRS) • Processing performed in ITRF14 • HTDP transforms to ITRF96 • ITRF 96 => NAD 83 transform. based on 12 global sites • NAD 83 Geocenter from Transit GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  4. Issues with NAD 83 The Need for Change Simplified concept of NAD 83 vs. “2022” Earth’s Surface h”2022” hNAD83 fNAD83 – f”2022” lNAD83 – l”2022” hNAD83 – h”2022” all vary smoothly by latitude and longitude “2022” origin ~2.24 m NAD 83 origin GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  5. The Need for Change GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  6. UN-GGIM (2015-2018) • The UN-GGIM Committee of Experts • Endorsed the global geodetic roadmap as a “principle-based briefing document for national Governments” • Welcomed the development of an implementation plan to link the road map recommendations to national policy developments • Elevated the GGRF working group (WG) to a Sub-Committee on Geodesy (SCoG) to strengthen the GGRF • Requested the development of a position paper to define the appropriate governance arrangements for the GGRF GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  7. GGRF Roadmap Global Geodetic Reference Frame • International Terrestrial Reference Frame (ITRF) • International Height Reference Frame (IHRF) GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  8. NGS Strategic Plan • Blueprint, Part 1: Geometric Coordinates • NOAA Tech Rep NOS NGS 62 • Blueprint, Part 2: Geopotential Coordinates • NOAA Tech Rep NOS NGS 64 • Blueprint, Part 3: Using the modernized NSRS • forthcoming GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  9. CORS GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  10. Foundation CORS (FCORS) Collocated + Densification + Plate Rotation + Additional GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  11. Other CORS in the Americas SIRGAS-CON Canadian Active Control (CAC’s) http://www.sirgas.org/en/sirgas-con-network/ GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  12. The Four TRF’s • Densified ITRF model • Control stations • FCORS/IGS sites <=> ITRF • Subset chosen for EPP • Four Frames after EPP • CATRF (w/SIRGAS) • MATRF (~ w/GGIM-AP/C.S.) • PATRF (w/GGIM-AP) • NATRF (IAG 1.3c/SNARF 2.0) • Intra-Frame Velocity Models GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  13. NATRF • Each frame will get 3 parameters • Euler Pole Latitude • Euler Pole Longitude • Rotation rate (rad/yr) • Used to compute time-dependent TRF2022 coordinates from time-dependent ITRF coordinates • To calculate a Stable North America Reference Frame, you need “stable” points GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  14. CATRF (DEMETS 2007) GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  15. PATRF GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  16. MATRF GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  17. NAPGD2022 GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  18. GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  19. IFVM (Deformation) Modeling • Gridding CORS • CORS+Geophysical Modeling (Canadian) • CORS+InSAR GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  20. CORS Horizontal Velocities-REPRO2 GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  21. CORS Vertical Velocities-REPRO2 GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  22. Canadian Vertical Velocity Model • ICE6G GIA model is fit to CAC • Fills in areas between CACs for vertical motion GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  23. GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

  24. Questions? GeoPrevi 2018 International Symposium Bucharest, Romania 29-30 OCT 2018

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