INDOT Height Modernization Project
Ryan C. Swingley, PLSAndrew D. Baxter, PLS
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
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
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
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
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
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
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Why is Ht. Mod. Needed?
• Regions of Changing Height
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
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
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
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
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
InCORS
45 GNSS CORS
CORS eliminated 2 days of GPS obs.
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
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
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
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
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
State-wide Ht. Mod. Project
• Current Geoid 12a• Consists of 137 BM• Current number of BM created several gaps in 20 KM spacing
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
State-wide Ht. Mod. Project
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
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
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
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
Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships
Questions?
• Ryan C. Swingley, PLS Seiler Instruments [email protected]
• Dee Baxter, PLS INDOT [email protected]