Height Modernization Overview Christine Gallagher Constituent Resource Manager

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Height Modernization Overview Christine Gallagher, Constituent Resource Manager NOAA’s National Geodetic Survey Height Modernization

Height Modernization Overview Christine Gallagher, Constituent Resource Manager NOAA’s National Geodetic Survey Height Modernization Partner Meeting April 14, 2015

Height Modernization Establish accurate heights using GPS/GNSS with traditional leveling, gravity, and modern remote

Height Modernization Establish accurate heights using GPS/GNSS with traditional leveling, gravity, and modern remote sensing observations. Applications include: § Construction § Evacuation planning § Floodplain mapping § Subsidence monitoring § Precision agriculture § Determining high-water marks

Timelines 1994 - 1998 Meetings and report to Congress The National Height Modernization Program

Timelines 1994 - 1998 Meetings and report to Congress The National Height Modernization Program evolved over time. 2000 -2010 Funding to 18 states Present Regional Coordination Vertical reference frames continue to evolve. North American Vertical Datum of 1988 Gravity to Redefine the American Vertical Datum (GRAV-D) New Datums 2022

Height Modernization Guidelines A “Height Mod” survey is a way to get accurate “elevations”

Height Modernization Guidelines A “Height Mod” survey is a way to get accurate “elevations” with GNSS “Elevations” are orthometric heights, usually NAVD 88 Requires ties to leveled bench marks, at least indirectly 1997 2008 2016 NOS NGS 58 GPS-derived ellipsoid heights NOS NGS 59 GPS-derived orthometric heights Updated Guidelines

Height Modernization Today Height Modernization National Plan Ongoing NGS Activities Goal 1: Support NAVD

Height Modernization Today Height Modernization National Plan Ongoing NGS Activities Goal 1: Support NAVD 88 users today Updating Guidelines; Special Projects; GPS on BMs Goal 2: Modernize & improve vertical datum GRAV-D; Geoid Slope Validation Surveys Goal 3: Increase technical capacity with stakeholder base & workforce Webinars; Annual Meetings; Online Training

Height Modernization Today cont. State partners lead and manage projects Partners coordinate regionally Everyone

Height Modernization Today cont. State partners lead and manage projects Partners coordinate regionally Everyone will prepare for New Datums

Moving to New Datums Projects Resources § New web pages § Videos § FAQ

Moving to New Datums Projects Resources § New web pages § Videos § FAQ § Monthly webinars § Regional advisors

Contact information Email: ngs. htmod@noaa. gov Website: http: //www. geodesy. noaa. gov/heightmod/ Monthly Webinar

Contact information Email: ngs. htmod@noaa. gov Website: http: //www. geodesy. noaa. gov/heightmod/ Monthly Webinar Series • Second Thursday of every month • 2 pm to 3 pm eastern time • Email ngs. htmod@noaa. gov to receive meeting notices