USGG2012/GEOID12 Research & Development Geoid Team Dan Roman, Yan Wang Xiaopeng Li & Simon Holmes

Discussion Items W 0 determination Leveling Adjustments NA2011 GPSBM2012 OPUS-DB Timeline & Coordination

W 0 determination Canada to use geoid-based vertical datum 2013 – Needs a decision on final W 0 by 01 APR Analysis based on TBM’s & MSSH data using USGG2009 & CGG2010 and various MODT – Pacific analysis complete (NOV) – Atlantic in progress (JAN) – Gulf of Mexico and Arctic models still required (FEB) – Aim is to determine any offset from current W 0 – Jointly decide on best W 0 to use in USGG2012/CGG2013

Leveling Adjustments NA2011 PID’s sorted to find those on bench marks with leveled heights (forms GPSBM2012) Preliminary list (focusing on leveled heights only) provided to State Advisers Plus for analysis in NOV Updated list due out this month Awaiting adjustments for WI, MS, LA, TN, & AL – WI likely finished by middle of MAR Final assessment of leveled heights in late MAR when final GPSBM2012 list goes out

NA2011 Coordination is ongoing with NA2011 Team Final NA2011 values likely delivered in FEB for internal use of Geoid Team The NA2011 values will be integrated with leveling to form GPSBM2012 to make GEOID12 Release of GEOID12 will be coordinated with NA2011 release in early April

GPSBM2012 Composed of leveled heights & NA2011 ellipsoid coordinates NA2011 “final” coordinates delivered in FEB Final leveling determined after WI adjustment These will be used to make a final GEOID12 They will also be sent out in middle MAR to State Advisers Plus for one last scrub

OPUS-DB NA2007 => NA2011 conversion in early FEB Points will be checked to supplement NGSIDB values given in GPSBM2012 Focus will be filling voids in western states List will be sent out with GPSBM2012 updates Final NA2007 => NA2011 conversion in late APR

Timeline & Coordination January – 2 nd iteration of leveling out to State Advisers Plus February – W 0 analysis completed Decision with Canada on final W 0 Used to make USGG2012/CGG2013 – Leveling for TN, AL, MS, LA to be completed – OPUS-DB conversion/points pulled – “Final” NA2011 values delivered to Geoid Team – Preliminary GPSBM2012 list and OPUS-DB lists sent out to State Advisers Plus

Timeline & Coordination March – WI leveling adjustment completed – Final GPSBM2012 sent to State Advisers Plus – GEOID12 developed April – NGSIDB pulled to ensure values from NA2011 (and GPSBM2012) correctly reflect the database – NA2011 & GEOID12 released – Final NA 2007 => NA2011 conversion in OPUS-DB