New Datum: Vertical (Geopotential) FGCS Silver Spring, MD. July 24, 2011 Mark C. Eckl NGS Chief of Observation and Analysis Division, New Vertical Datum Project Manager Vertical Datum Status United States Gravimetric Geoid 2012 (USGG12) Hybrid Geoid 2012 (Geoid12) 2022 Definition of the Vertical Reference Surface Vertical Datum Other Geopotential Products Leveling Online Computation User Service (LOCUS) Vertical Time Dependent Positioning (VTDP) Geoid Slope Validation Survey 2011 (GSVS11) Floodplain Mapping Pilot Project Goals: Analyze how FEMA floodplain mapping will be affected by the release of the new datums Provide recommendations for FEMA, cooperating partners and NGS Conclusions Existing software and methods need to handle significant coordinates shift Horizontal: ft/0.828 m Vertical: ft/ m Larger impact on higher accuracy elevation data Minimal changes in the floodplain, will depend on the location, the mapping method, and engineering judgment The development of an implementation plan is extremely important for FEMA and other agencies 4 Full Report: Vertical Datum Other Geopotential Products Gravity for the Redefinition of the American Vertical Datum (GRAV-D) NEWTON ISAAC White = FY13 Orange = FY12 Green = FY11 and earlier Complete In FY13 GRAV-D White = FY13 Orange = FY12 Green = FY11 and earlier GRAV-D Thats All, Folks Questions?