Performance of GEOID09 for Height Conversion in Ohio

Performance of GEOID09 for Height Conversion in Ohio

Dorota A. Grejner-Brzezinska Ph.D. and Karla Edwards Satellite Positioning and Inertial Navigation Lab

Department of Civil and Environmental Engineering and Geodetic Science The Ohio State University

for the

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Ohio Department of Transportation

Office of Research and Development

State Job Number 134326

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August 2010

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-85

-83

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1. Report No.

2. Government Accession No.

FHWA/OH-2010/13 4. Title and subtitle

Performance of GEOI D09 for Height Conversion in Ohio

7. Author(s)

Dorota Grejner-Brzezinska, Karla Edwards

9. Performing Organization Name and Address

The Ohio State University Satellite Positioning and Inertial Navigation Lab Department of Civil & Environmental Engineering & Geodetic Science Columbus, OH 43210 12. Sponsoring Agency Name and Address Ohio Department of Transportation 1980 West Broad Street Columbus, OH 43223 15. Supplementary Notes

3. Recipient's Catalog No.

5. Report Date August 2010 6. Performing Organization Code

8. Performing Organization Report No.

10. Work Unit No. (TRAIS)

11. Contract or Grant No. 134326 13. Type of Report and Period Covered

14. Sponsoring Agency Code

16. Abstract

This study evaluates Height Modernization issues related to NGS hybrid geoid performance (specifically GEIOD09 and GEOID03) for height conversions between NAV D88 and NA D83 for the state of Ohio and quality of gravity and height data needed to produce a cm-accurate gravimet ric geoid. The hybrid geoid is of particular significance in this study, because an accurat e hybrid geoid would support both accurate height conversions as well as improve orthometric (MS L) height determination, facilitating the almost-total replacement (except in GPS-antagonistic environments) of traditional leveling exercises by GPS leveling, a much more cost- and labor-efficient heighting technique than its traditional counterpart.

17. Key Words

18. Distribution Statement

Height moderniz ation, geoid, GPS, orthometric

No restrictions. This document is available

height, ellipsoidal height, GEOID09

to the public through the National

Technical Information Service, Springfield,

Virginia 22161

19. Security Classif. (of this report) 20. Security Classif. (of this page) 21. No. of Pages 22. Price

Unclassified

Unclassified

46

Form DOT F 1700.7 (8-72)

Reproduction of completed pages authorized

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Performance of GEOID09 for Height Conversion in Ohio

Project title:

Performance of GEOID09 for Height Conversion in Ohio

SJN: 134326

Authors: Dorota A. Grejner-Brzezinska and Karla Edwards

Research Agency: The Ohio State University

Report date: August 2010

Sponsoring Agency Ohio Department of Transportation,

Office of Aerial Engineering

Prepared in cooperation with the Ohio Department of Transportation and the U.S. Department of

Transportation, Federal Highway Administration

Performance of GEOID09 for Height Conversion in Ohio Disclaimer

The contents of this report reflect the views of the authors who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Ohio Department of Transportation or the Federal Highway Administration. This report does not constitute a standard, specification or regulation.

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Performance of GEOID09 for Height Conversion in Ohio Acknowledgements

The authors thank the staff of the ODOT Office of Aerial Engineering for their contributions to this project. In particular, we want to express our gratitude to John Ray, Administrator, Office of Aerial Engineering, for his continuing support and to David Albrecht, Anthony Williams and David Beiter for their coordination of the data collection. The authors also wish to thank the National Geodetic Survey Gravity and Geoid Group (in particular Dr. Dru Smith, Dr. Dan Roman and Jarir Saleh) as well as NGS State Geodetic Advisor for Ohio, David Conner and NGS gravity specialist Daniel Winester for their input in and support of this study.

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Performance of GEOID09 for Height Conversion in Ohio

Table of Contents

1. Introduction

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2. Research Objectives

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3. General description of the research

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3.1 Performance of NGS geoids in Ohio

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3.2 Gravimetric geoid development for Ohio using publicly-available data

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3.2.1 Comparison of Relative Gravity in the vicinity of Absolute Gravity Data

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Relative Gravity Data Set

Absolute Gravity Data stations

Description of Relative Gravity Comparison Study

3.2.2 "Remove-Restore" Gravimetric Geoid Development

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Earth Gravitational Model 2008 (EGM2008)

Gravity Reductions

Bouguer Plate Removal and Free Air Reduction

Classical Terrain Correction

GTOPO30

The Stokes' Integral and Gravimetric Geoid Determination

The Indirect Effect

The Gravimetric Geoid Undulation

3.3 Random error influence on gravimetric geoid solution

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4. Results: Findings of the research effort

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4.1 Evaluation of hybrid geoid performance in Ohio at VRS-derived GPSBMs

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4.2 Gravimetric geoid over Ohio using publicly-available data

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4.2.1 Absolute Relative Gravity Comparison

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4.2.2 GTOPO30 Terrain Corrections and the Gravimetric Geoid

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4.3 Evaluation of the impact of imposed random errors on the gravimetric solution

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5. Conclusions and Recommendations

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6. Implementation Plan

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7. Bibliography

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Appendices

Appendix A: GEOID03 and GEOID09 models in Ohio

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Appendix B: Relative Gravity Data Density

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Appendix C: About Absolute Gravity Data Density

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