1 Workshop Organization Dave Wells

2 Tuesday Morning 16 March 2004 Applications and Requirements 0800 – 0830MORNING COFFEE 0830 – 0845Welcome Don Roman The University of Southern Mississippi 0845 – 0900Workshop Organization Dave Wells The University of Southern Mississippi 0900 – 0930Fleet Survey Team GPS Activities Chris Esposito Fleet Survey Team, Naval Oceanographic Office 0930 – 1000PHOTO OPPORTUNITY 1000 – 1020COFFEE BREAK 1020 – 1100Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) KGPS Challenges Jeff Lillycrop, Eddie Culpepper, and Eddie Wiggins U.S. Army Corp of Engineers / Naval Oceanographic Office 1100 – 1130Hydrographic Applications of Precise Geodesy John Brozena Naval Research Laboratory 1130 – 1200NAVOCEANO Hydrography Department Upgrades to its Positioning Systems and Hopes to Operationally Reduce its Bathymetric Measurements to a Seamless Vertical Datum Elliot N. Arroyo-Suarez Naval Oceanographic Office

3 Tuesday Afternoon 16 March 2004 Seamless Vertical Datum 1200 – 1300LUNCH 1300 – 1330A Comparison of Error Budgets for Vertical Positioning Using Traditional and GPS Carrier-Phase Approaches Rob Hare Canadian Hydrographic Service 1330 – 1400GPS Tide Detection: Implementation of a Fully Integrated Solution for Hydrographic Surveys on the St. Lawrence River from Data Collection to Data Processing Louis Maltais Canadian Hydrographic Service 1400 – 1430The NOS National Program for Tidal Datum Field Modeling for Vdatum Kurt Hess National Oceanic and Atmospheric Administration 1430 – 1450COFFEE BREAK 1450 – 1520An Easily Deployed and Recovered GPS-Tracked Water Level Buoy Marshall Earle, Mike Brown, and Jeffrey Gallagher Neptune Sciences, Inc – 1620BREAKOUT SESSIONS 1620 – 1700DISCUSSION PERIOD 1800 – 1900COCKTAIL HOUR Steve’s Marina Restaurant Sponsored by Applanix Corp – 2100DINNER Steve’s Marina Restaurant Sponsored by The University of Southern Mississippi

4 Wednesday Morning 17 March 2004 Single Baseline Processing 0800 – 0830MORNING COFFEE 0830 – 0900University of New Hampshire GPS Research Activities Lloyd Huff University of New Hampshire 0900 – 0920The Princess of Acadia GPS Ferry Project Marcelo Santos University of New Brunswick 0900 – 1000Initial Results and Future Goals of the Princess of Acadia GPS Ferry Project Karen Cove University of New Brunswick 0900 – 1000Preliminary Performance Analysis of the Enhanced UNB RTK Software for Long Baselines Don Kim University of New Brunswick 1000 – 1020COFFEE BREAK 1020 – 1100Sensitivity of Surface Meteorological Errors on Tropospheric delay / Comparison of Three GPS Constellations for Height Determination Ben Remondi The XYZs of GPS, Inc – 1130USM GPS Research Activities Sunil Bisnath, Dave Wells, Stephan Howden, and Dave Dodd The University of Southern Mississippi 1130 – 1200POS MV Vertical Positioning Steven Woolven, Peter Canter, and Louis Lalumiere Applanix Corp.

5 Wednesday Afternoon 17 March 2004 Multi-Baseline Processing 1200 – 1300LUNCH 1300 – 1330Multiple Reference Station DGPS RTK for Sub-Decimeter Level 3D Positioning Paul Alves University of Calgary 1330 – 1400Long Baseline Buoy and Vessel Positioning Oscar Colombo Goddard Space Flight Center 1400 – 1430Enhanced DGPS Mike Parsons U.S. Coast Guard 1430 – 1450COFFEE BREAK 1450 – 1600BREAKOUT SESSIONS 1600 – 1630DISCUSSION PERIOD 1830 – 1930COCKTAIL HOUR Vrazel’s Restaurant Sponsored by Fugro Chance Inc – 2200BANQUET Vrazel’s Restaurant Sponsored by C&C Technologies, Inc.

6 Thursday Morning 18 March 2004 Precise Point Positioning 0800 – 0830MORNING COFFEE 0830 – 0850C-Nav: Introduction and Accuracy Jimmy Chance C&C Technologies, Inc – 0910C-Nav: Application to Hydrography Pete Alleman C&C Technologies, Inc – 0930C-Nav: New Developments John Roscoe-Hudson C&C Technologies, Inc – 1010Comparison of Network and State Space DGPS Services / Impact of High Solar Activity of DGPS / Real Time Tidal Monitoring for Seismic Data Collection Applications Richard Barker Fugro Chance, Inc – 1030COFFEE BREAK 1030 – 1100The International Association of Geodesy and Precise Point Positioning Sunil Bisnath The University of Southern Mississippi 1100 – 1200BREAKOUT SESSIONS

7 Thursday Afternoon 18 March 2004 Wrap-up 1200 – 1300LUNCH 1300 – 1445WRAP UP SESSION / Discussion of Opportunities 1445 – 1500CLOSING REMARKS Dave Wells The University of Southern Mississippi

8 Charge to breakout groups Five topics for break-out group discussion are identified below. Please mark your first and second choices on the sign- up sheet being circulated. The topics chosen for the actual breakout groups will depend on the interest y’all show. The following issues / questions are NOT breakout group “do-lists”. They are only suggested starting points, from which each group will select the few issues of most concern to group members.

9 1 - Modeling of temporal and spatial water level variations / seamless vertical datum What are the prospects for future enhancements in spatial tidal modeling performance? What are the main limitations to this performance? What are the needs and requirements for a seamless vertical reference frame? What are the ingredients required to realize the concept of a seamless vertical reference frame? What enhancements are possible / required in geoid – ellipsoid separation models to realize the goal of a seamless datum? What enhancements are possible / required in tidal datum – ellipsoid separation models to realize the goal of a seamless datum? How do the two approaches to datum transfer field generation used by NOAA compare (i.e. the hydrodynamical model generated field, and the data-generated field also known as TCARI = Tidal Constituent and residual Interpolation)? What other approaches may be possible / feasible? Is the Princeton Ocean Model the best basis for tidal datum field hydrodynamical modeling? What are the opportunities for collaboration among government agencies in addressing these questions?

10 2 – Convergence of GPS processing approaches What are the advantages, disadvantages and performance differences among PPK processing based on the (a) single baseline (b) network, and (c) point positioning approaches? Are these approaches fundamentally different? What are the opportunities for convergence of these three methods? What challenges must be overcome for such convergence? What improved accuracy and reliability of results can be demonstrated by PPK in comparison with RTK? What are the advantages and disadvantages of PPK vs RTK? What are the prospects / needs for increased communication system bandwidth to support reliable RTK? What differences in performance have been experienced with different PPK software packages? What are the prospects for future enhancements in this performance? What are the main limitations to this performance? What are the opportunities for collaboration among PPK users and suppliers in addressing these questions?

11 3 – What should a GPS PPK “height” be? What variety of PPK solution antenna height is most useful for marine PPK users (e.g. ellipsoid heights, heights above Chart Datum at a defined water level gauge location, height above a modeled Chart Datum at the user’s location)? What should be reported in the NMEA GGA string altitude field? How important is an accurate geoid-ellipsoid separation in the GGA geoid height field? How should this be computed? What are the impacts of earth tides and ocean tidal loading on heights reported to users? Should the ellisoid - geoid separation in the GGA string vary with earth tide and/or tide loading? Should an earth tide corrector be supplied, or an algorithm supplied to users?

12 4 – Future prospects for long range PPK What are the projected capabilities (range, ambiguity-resolution reliability, etc.) today and in the near future to be provided by proposed commercial and public CPDGPS services? What are the prospects for future enhancements in this performance? What are the main limitations to this performance? What are the prospects / needs / benefits for raw data (not corrections) from dozens or hundreds of reference stations to “rain down” on users? What are the prospects for higher accuracy broadcast ephemeris and satellite clock models? What are the prospects for greatly reduced GPS multipath contamination? What will be the impact of the changes due to GPS modernization on PPK performance? What will be the impact of Galileo signals on combined GPS / Galileo PPK performance? What increased performance could result from a re-designed satellite constellation? What are the opportunities for collaboration among PPK users and suppliers to address these questions?

13 5 – Towards better atmospheric modeling How important is the issue of ionospheric errors now (using expensive dual frequency receivers), and in the future (using C2 and inexpensive dual frequency receivers)? What improved PPK performance might be expected were the troposphere (differential tropospheric delays) to be perfectly modeled? How close can we aspire to achieve this goal, through the use of numerical weather models? What specific differential tropospheric delay procedures are presently available, and how can they be improved in the future? How applicable are existing numerical weather models (generally collected over land) to estimating tropospheric delays over the ocean? What is the best method of testing and evaluating the impact of new approaches to atmospheric modeling on marine PPK performance?

14 Logistics items Coffee breaks are here in the room. Lunches at in the dining room at the west end of the entrance corridor. The photo session in 30 minutes is under the Friendship Oak just outside. There is an facility available here in the room. Each speaker should have received a complementary Portable Flash Drive (USB memory stick). Please put your presentation on these drives ASAP, and ask Robyn Montgomery to add it to our collection. With your cooperation, we intend to distribute Workshop CDs containing all presentations before we wrap-up on Thursday. We need the meal and breakout sign-up sheets returned by first coffee break.

15 Carrier Phase GPS Navigation for Hydrographic Surveys and Seamless Vertical Datums March 2004 Gulf Park Conference Center. The University of Southern Mississippi WORKSHOP AGENDA