INDOT%20Height%20Modernization%20Project

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INDOT Height Modernization Project

• Ryan C. Swingley, PLS
• Andrew D. Baxter, PLS

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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

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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

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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

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Why is Ht. Mod. Needed?

• Regions of Changing Height

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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

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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

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InCORS

• 45 GNSS CORS

CORS eliminated 2 days of GPS obs.
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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

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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

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State-wide Ht. Mod. Project

• Current Geoid 12a
• Consists of 137 BM
• Current number of BM
• created several gaps
• in 20 KM spacing

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State-wide Ht. Mod. Project
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State-wide Ht. Mod. Project

• Phase I

District New Stations of Tie Points
LaPorte 15 60
Fort Wayne 10 40
Crawfordsville 10 40
Greenfield 10 40
Vincennes 25 100
Seymour 20 80
SUB-TOTAL 90 360
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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

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Questions?

• Ryan C. Swingley, PLS
• Seiler Instruments
• rswingley_at_seilerinst.com
• Dee Baxter, PLS
• INDOT
• abaxter_at_indot.in.gov