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INDOT Height Modernization Project

Ryan C. Swingley, PLS Andrew D. Baxter, PLS. INDOT Height Modernization Project. What is Ht. Mod.?. A National Oceanic and Atmospheric Administration Program Uses GPS and other new technologies to improve elevation accuracy Program Objectives

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INDOT Height Modernization Project

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  1. Ryan C. Swingley, PLS Andrew D. Baxter, PLS INDOT Height Modernization Project

  2. What is Ht. Mod.? • A National Oceanic and Atmospheric Administration Program • Uses GPS and other new technologies to improve elevation accuracy • Program Objectives • Improve Transportation by reducing design and construction costs • Accurate determination of floodplains • Study runoff amounts and effects • Improve agricultural yields • Manage coastal resources

  3. Why is Ht. Mod. Needed? • 11575 National Spatial Reference System (NSRS) monuments • 10941 set between 1874 to 1979 • Only 2514 monuments have been reported as recovered since 2000 • These monuments are the foundation for all Geospatial Infrastructure, GIS, construction and development

  4. Why is Ht. Mod. Needed? • National Geographic Vertical Datum of 1929 • North American Vertical Datum of1988 • INDOT – mixed datums, sometimes unknown • These different datums cause potential harm to the public • Ht. Mod will create a densified and unified datum for the scientific, geospatial, construction and agricultural communities • NGS will implement a new vertical datum in 2021

  5. Why is Ht. Mod. Needed? • Regions of Changing Height

  6. Why is Ht. Mod. Needed? • New NGS datum will based solely on airborne gravitation measurements • Ht. Mod. will facilitate the current datum to be updated for 2021 • Bring previous work (survey, construction, GIS) to be more accurately updated to 2021 datum

  7. Indiana Ht. Mod. History • IGIC/ISPLS joint committee since 2006 • Held a Ht. Mod. Forum in 2008 • Implementation of the InCORS in 2009 • Submitted an Indiana Ht. Mod. Plan to NOAA/NGS in 2009 • Joined the Great Lakes Region Ht. Mod. Consortium in 2010 • INDOT Benchmark Inventory (2010) • Hamilton County Ht. Mod. Pilot Project in 2011 • SPR Funds requested and granted in 2012

  8. InCORS 45 GNSS CORS CORS eliminated 2 days of GPS obs.

  9. InCORS • Registered Users:            • Survey = 664 • Construction = 121 • GIS = 81 • AG = 607 • RTN Usage: • 2012 average per day = 134 • 2013 seeing increase of 26 more users per day • 676 different companies using network

  10. State-wide Ht. Mod. Project • Phase I - Planning Phase • Recover existing 1st and 2nd order Benchmarks • 20 km spacing • GPS and bluebook using NGS TM 58 and 59

  11. State-wide Ht. Mod. Project • Current Geoid 12a • Consists of 137 BM • Current number of BM created several gaps in 20 KM spacing

  12. State-wide Ht. Mod. Project

  13. State-wide Ht. Mod. Project • Phase I

  14. What is next? • Request more SPR Funds for Expansion • New INDOT standards for leveling benchmark • Expansion of network to more localized areas and project specific control • More Accurate elevations on existing CORS • 2 cm Geoid • Head start on 2021 vertical datum change

  15. Questions? • Ryan C. Swingley, PLS • Seiler Instruments • rswingley@seilerinst.com • Dee Baxter, PLS • INDOT • abaxter@indot.in.gov

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