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On-line Positioning User Service (OPUS) and GEOID09
3-D Tools for Accurate Geo-referencing
ASCE Workshop - Houston Texas - February 6, 2010
Speakers
Joe Evjen is a Supervisory Geodesist with the National Geodetic Survey in Silver Spring, MD. Joe began his NOAA career aboard hydrographic survey ships MT MITCHELL and RUDE following graduation with honors in 1990 from the University of Florida's surveying and mapping program. More recently, Joe helped manage nationwide high‐accuracy GPS survey projects and now focuses on improving NGS products and guidelines as chief of the National Geodetic Survey's Standards and Applications branch. Joe also participated in the recent additions to the OPUS website, including a new datasheet publishing function.
Daniel R. Roman, Ph.D., has been a Research Geodesist with the National Geodetic Survey since 1999. He is the team lead for Geoid Modeling and Research as well as the Principal Investigator for the Gravity for Redefinition of the American Vertical Datum (GRAV-D) Project. He has participated in development of GEOID99, GEOID03, GEOID06, GEOID09 and associated models. He also leads the scientific effort towards a cm-level geoid height model that will replace NAVD 88 and serve as a future vertical datum. He has a B.S. from the University of Southern California in Geology (1985), a M.S. from the Ohio State University in Physical Geodesy (1993), and a Ph.D. from the Ohio State University in Potential Fields Geophysics (1999).
Topics covered
Morning Session
The morning session of the workshop will cover the principles of surveying with GPS, and tools available to increase survey accuracy. Particular focus will be given to use of the National Geodetic Survey's Continuously Operating Reference Station (CORS) network and Online Positioning User Service (OPUS) in establishing geodetic control and measuring accurate heights. Participants will learn:
1. Understand theoretical and practical aspects of modern GPS methodologies.
2. How to plan surveys using the latest technology.
3. Common errors in GPS operation.
4. New procedures that can reduce costs.
5. Terrestrial reference frames and how to transform between them.
6. How to use the Online Positioning User Service (OPUS).
Afternoon Session
The afternoon session will be entirely devoted to describe GEOID09. The National Geodetic Survey (NGS) has recently released a new geoid height model, GEOID09, for use in vertical positioning. This model follows in a long line of models tailored to fit between ellipsoidal heights determined with respect to NAD 83 and orthometric heights with respect to NAVD88. There have been significant shifts from GEOID03 and GEOID09. Most of these differences derive from significant changes in other data and models used to create GEOID09. Some of these changes include the incorporation of the GRACE satellite gravity mission data, improved and more consistent terrain models, shifts in ellipsoidal heights resulting from the National Readjustment of 2007, and re-evaluating the types of bench mark data to incorporate. This presentation will cover these and other underlying reasons to show how they propagate through to create large differences for some regions between GEOID03 and GEOID09. In addition to these changes in the conterminous United States, the models have been expanded to cover new regions and territories including the Commonwealth of the Northern Marianas Islands, Guam, and American Samoa. Each of these regions has their own datum point analogous to Father Point/Rimouski for NAVD 88.
USGG2009, DEFLEC09, and USDV2009 will also be covered in some detail.
Handout Material: A notebook containing various handouts relating to accurate georeferencing.
Hours: Eight hours of instruction less two 15 minute breaks. (Typically,
the schedule will be 8am to noon and 1pm to 5pm.) Four hours will be
devoted to each of the major topics — four hours in the morning devoted
to 3d and vertical geodetic datums and four hours in the afternoon
devoted to accurate GPS using CORS and OPUS.
Certificate: Attendees will receive a Certificate from ASCE. ASCE is an IACET authorized provider of continuing education and training. ASCE reserves the right to cancel the seminar if fewer than twelve people register. Questions? Please call Brian Sien at 703.295.6314 Cancellations: A refund equal to the fee paid less a $50 administrative fee will be made to anyone cancelling upto seven days before the seminar. Substitutions may be made at any time at no additional expense.
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