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

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


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



• 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



• Regions of Changing Height



• 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


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


InCORS

45 GNSS CORS

CORS eliminated 2 days of GPS obs.


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


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



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



• 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


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


Questions?

• Ryan C. Swingley, PLS Seiler Instruments [email protected]

• Dee Baxter, PLS INDOT [email protected]

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

Documents

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