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National Height Modernization Program Status in Minnesota April 30, 2013

National Height Modernization Program Status in Minnesota April 30, 2013. John Barke Geodetic Engineer Minnesota Department of Transportation. History of Ht Mod Leveling in Minnesota.

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National Height Modernization Program Status in Minnesota April 30, 2013

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  1. National Height Modernization Program Status in MinnesotaApril 30, 2013 John Barke Geodetic Engineer Minnesota Department of Transportation Natl Ht Mod Partners Mtg - Frankfort, KY

  2. History of Ht Mod Leveling in Minnesota • Planned to start leveling in 1996 to the Minnesota HARN’s that did not have a previous 1st or 2nd order published benchmark. • Project never really got going (personnel changes). • Started up again in 2000 after phone call to NGS. • All 603 HARN marks (100%) have been leveled to 2nd order Class I or better. • 119 RTN/CORS sites leveled to or near. Natl Ht Mod Partners Mtg - Frankfort, KY

  3. All 603 HARNS Natl Ht Mod Partners Mtg - Frankfort, KY

  4. History of Height Mod GPS (horizontal) work in MN • HARN • Started county densification in 2000 after phone call with NGS. • FBN • CBN • NAD 83(2007) adjustment • NAD83 (2011) adjustment Natl Ht Mod Partners Mtg - Frankfort, KY

  5. County partnerships • 61 out of 87 counties (70%) completed • If a county wanted to partner most completed a 3 mile grid spacing. • If a county declined to partner, MnDOT completed the county at a 6 mile grid spacing. • Current rate of completion is 3-4 counties per year. • Should be complete in 7-8 years. Natl Ht Mod Partners Mtg - Frankfort, KY

  6. County Partnership status - Horizontal Natl Ht Mod Partners Mtg - Frankfort, KY

  7. County Partnership status - Vertical Natl Ht Mod Partners Mtg - Frankfort, KY

  8. History of Height Mod funding for leveling in Minnesota Started utilizing consultants for Height Mod leveling in 2004 with MnDOT funds. MnDOT NGS FY2005 $ 197,000 $ 0 FY2006 $ 674,500 $ 0 FY2007 $ 989,000 $ 0 FY2008 $ 296,000 $ 0 FY2009 $ 895,000 $ 80,000 (Grant awarded) FY2010 $ 300,000 $ 0 FY2011 $ 642,000 $ 0 FY2012 $ 1,040,000 $ 0 FY2013 $ 1,000,000 $ 0 Total consultant-performed leveling to date $ 6,113,500 Total Mn/DOT-performed leveling to date $ (equal or greater than consultants) Natl Ht Mod Partners Mtg - Frankfort, KY

  9. Minnesota VRS/CORS • 119 of 131 VRS/CORS stations leveled to. • Of the remaining to be leveled • 1 in Minnesota • 2 in South Dakota • 9 in Iowa • Of the 110 submitted, 61 have been accepted into National CORS. • Final total of 140 VRS/CORS by 2018. • Fill in gaps, holes to improve coverage. Natl Ht Mod Partners Mtg - Frankfort, KY

  10. CORS status in Minnesota as of October 2012 Natl Ht Mod Partners Mtg - Frankfort, KY

  11. Minnesota CORS accepted in National CORS - April 2013 Natl Ht Mod Partners Mtg - Frankfort, KY

  12. NGS Backlog of Minnesota Projects • As of December 2012 • 136 vertical projects • 6 horizontal projects • 39 horizontal projects to be adjusted at MnDOT • Concerns about trivial vectors with NGS • MnDOT looking into processing in PAGES • 61 of 110 submitted CORS to NGS accepted into National CORS. Awaiting acceptance of remaining 49 CORS submitted. Natl Ht Mod Partners Mtg - Frankfort, KY

  13. Height Modernization Stations Natl Ht Mod Partners Mtg - Frankfort, KY

  14. Minnesota Horizontal Order A, B & C marks Natl Ht Mod Partners Mtg - Frankfort, KY

  15. Minnesota Vertical 1st and 2nd order Natl Ht Mod Partners Mtg - Frankfort, KY

  16. Minnesota 3D marks • Have both Horizontal • A, B, or C • And Vertical • 1/1, 1/2 or 2/1 Natl Ht Mod Partners Mtg - Frankfort, KY

  17. MN Level Net as of 1991 This represents the data set that was adjusted to become NAVD88 Natl Ht Mod Partners Mtg - Frankfort, KY

  18. MN Leveling Added Since 1991 These new leveling campaigns have proven that many 4-8 cm height biases exist in NAVD88. Natl Ht Mod Partners Mtg - Frankfort, KY

  19. MN Level Net as of 2013 Minnesota would like to see a new regional (MN/WI) adjustment of all leveling to date constrained to the National CORS and to surrounding states (IA/SD/ND). Natl Ht Mod Partners Mtg - Frankfort, KY

  20. Future of Height Mod in Minnesota • 5 year plan • Complete leveling of all state roads. • Re-level vertical control surveys performed before 1980 (> 30 years old). • Move and re-level vertical control marks within 50 foot of railroad tracks – (safety). • Continue to “blue book” horizontal and vertical surveys. • Continue county densifications for the entire State of Minnesota on 6 or 3 mile grid spacing. • Continue to incorporate Wisconsin’s RTRN system with Minnesota’s RTRN. Natl Ht Mod Partners Mtg - Frankfort, KY

  21. Uncertain Future of Height Mod in Minnesota • 5 year plan • Waiting for guidance on gravity measurements. • Additional ground based measurements needed? • Waiting for OPUS PROJECTS to be implemented. • Stop the “bluebook” submittal process. • Waiting for National vertical adjustment based on National CORS system. • Waiting for vertical backlog at NGS to get out of the triple digits for Minnesota (136 as of December 2012) Natl Ht Mod Partners Mtg - Frankfort, KY

  22. How MN Gets It Done Natl Ht Mod Partners Mtg - Frankfort, KY

  23. Questions or comments Contact: Richard E. Morey, Assistant Office Director John R. Barke, Geodetic Engineer David A. Zenk, Geodesist/State Geodetic Advisor The Minnesota State Fish – the Walleye Open Season begins May 11, 2013 Natl Ht Mod Partners Mtg - Frankfort, KY

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