1. Elevation and Geodetic Control Workgroup
Aka Height Mod Committee
Aka Joint Committee of ISPLS-IGIC for the discussion of horizontal and vertical control
Aka ISPLS GIS/LIS Committee

2. Workgroup Members Ryan Swingley, LS, USI Consultants
Robert Wilkenson, LS, DNR
Joel Bump, INDOT
Eric Banschbach, LS, INDOT
Henry Aldridge, LS, INDOT
Matt Badger, LS, BLA
Matt Healy, LS, VS Engineering
Joe Mullins, LS, Hamilton County Surveyors Office
Perry Cloyd, LS, Midwest Surveying
William A. Schmidt, PE, LS, TBE Group
B.H.W. van Gelder, PhD, Purdue University
Phil Worral, GISP, IGIC
Thomas A. Mahon, PE, LS, Woolpert

3. What is Height Mod Height Modernization
Activities undertaken with the intention of making the establishment of elevations easier, cheaper, more accurate, and more consistent.
Started as a Joint Effort between NGS and California
The San Andreas fault caused issues with establishing accurate elevations in California
Too expensive to continue leveling between bench marks with ground moving so often
Newer technologies were making the establishment of elevations cheaper than ever

4. Height Mod in Indiana (1 of 2)

5. Height Mod in Indiana (2 of 2)

6. Past Activities (Continuum of Geodetic Control Projects)
Mid – Late 1990’s
First Two Phases of Indiana High Accuracy Reference Network
Early 2000’s
Third Phase of Indiana HARN
Mid-2000’s
Public Land Section Corner Perpetuation
Digital Submission Ordinances
Initial Support for InCORS
Initial Grant Proposal for Height Mod (2006)

7. Height Mod - Continued
After California, Height Mod Expanded to Louisiana
Subject to surface subsidence due to the removal of underground oil and gas deposits
Expanded to Wisconsin
Because of forward thinking DOT personnel as well as federal congressional delegation
Example used was a typical DOT aerial mapping project
By 2007 Some 15 States Funded by NGS

8. Height Mod Time Line for Indiana
2006
Initial Grant Proposal to USGS for Matching Funds
2007
Indiana Height Mod Forum
Converted Indiana from Uninterested into an Interested State
2008
Developed Height Mod Roadmap and Report

9. Height Mod Status by State

10. Height Mod Activities in Indiana in 2009
Represented Indiana at GLRHM Forums
Lansing, Michigan March 2009
Rockford, Illinois November 2009

11. Height Mod Activities in Indiana in 2009
Explored County Coordinate Systems (Matt Badger, BLA)

12. Height Mod Activities in Indiana in 2009
Developed Justifications for Height Mod
Precision Agriculture
Multiple Datums and Construction Survey Blunders
Aerial Mapping Projects
Increased Productivity for Conventional Surveyors
Benefits of Accurate Flood Mapping
Benefits to Subsurface Utility Engineering
Increased Productivity due to Machine Control

13. Height Mod Activities in Indiana in 2010

14. Height Mod Activities in Indiana in 2010

15. ISPLS/IGIC Height Mod Committee
Questions?
Comments?
Volunteers?