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Height Modernization Activities at NGS

The National Height Modernization Program aims to improve access to accurate heights through activities such as obtaining orthometric heights using GNSS, leveling projects, GRAV-D Project, geoid modeling, and research. This program enables efficient and cost-saving methods of obtaining accurate heights. Learn more about the NGS Ten-Year Plan and ongoing projects.

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Height Modernization Activities at NGS

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  1. Height Modernization Activities at NGS Christine Gallagher National Partner Meeting April 30, 2014

  2. The National Height Modernization Program: • aims to improve access to accurate, reliable, consistent “heights;” • often focuses on obtaining orthometric heights using GNSS; • also includes leveling projects, GRAV-D Project, geoid modeling, and other research; and • ultimately enables efficiently obtaining accurate heights, with major cost savings.

  3. NGS Ten-Year Plan & HMOD Plan PARALLEL GOALS

  4. Goal 1 Support NAVD 88 users today

  5. Height Modernization guidelines NOS NGS 58 GPS-derived ellipsoid heights (November 1997) NOS NGS 59 GPS-derived orthometric heights (March 2008)

  6. Updating NGS 58/59 • Data collected in Oct. thru Dec. 2013 • Data analysis ongoing • Goal for updated guidelines in 2016

  7. More ongoing projects • Refine and streamline submittal process (“re-invent” Bluebooking) • Completing improvements to ADJUST • Defining requirements for improved LOCUS • Update River Crossing Procedures • Proof of concept planned for summer 2014 • Goal for updated procedures in winter 2014

  8. Upcoming projects • GPS survey in southern Louisiana • Following 2004, 2006 and 2010 surveys • GPS survey in Great Lakes • Preparing for next International Great Lakes Datum • Nationwide vertical adjustment • Use NAD 83(2011) ellipsoid heights, GEOID12A, and subset of national GNSS network • Constrain to leveled NAVD 88 bench marks • Determine GNSS-derived NAVD 88 heights on non-leveled marks

  9. Goal 3 Increase stakeholder and workforce technical capacity

  10. Regional Coordination • NGS coordinated webinars • Nov. 19, 2013 for western states • Mar. 4, 2014 for eastern states • Locally lead meetings projects • Great Lakes Consortium • Gulf Coast cross-state projects • Western group now meeting regularly • Eastern kick-off meeting on June 10

  11. COMET projects • Creating videos introducing datums to non-technical audience • Developing online lesson on vertical datums to non-surveying technical professionals

  12. NGS webpage(s) • Height Mod regional pages will be updated and will replace state pages by June 2014 • Height Mod pages will continue to update events, outreach, news and project information

  13. Collaborative efforts • GPS on bench marks • Publicity for surveying • Improve future hybrid geoid models • Research and university • Hollings scholar research projects • NOAA Cooperative Institute Program • Professional Societies • National Society of Professional Surveyors

  14. Questions Christine Gallagher Program Analyst National Geodetic Survey Email: Christine.Gallagher@noaa.gov Office: 301-713-3187 x132 Cell: 202-236-6092 http://www.ngs.noaa.gov/heightmod/

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