1. Geodetic Applications of GNSS within the United States Dr. Gerald L. Mader National Geodetic Survey NOS/NOAA Silver Spring, Maryland USA Munich Satellite Navigation Summit March 6-8, 2007

2. February 10, 2007 Marked the 200 th Anniversary of the U.S. Coast and Geodetic Survey

4. To define, maintain and provide access to the National Spatial Reference System (NSRS) to meet our nation’s economic, social, and environmental needs To be a world leader in geospatial activities, including the development and promotion of standards, specifications, and guidelines. NGS MISSION

5. Defining the National Spatial Reference System ~ 1200 Sites + 15 sites/month 185 Organizations 3 GLONASS data now > 100 GLONASS capable

6. CORS AIRPORTS HARN 3436 Projects 67693 stations National Readjustment NAD83 (NSRS2007) GPS DATA ONLY http://www.ngs.noaa.gov/NationalReadjustment

7. IMPROVING POSITIONAL ACCURACY TIMENETWORKLOCAL NETWORKSPANACCURACYACCURACY NAD 271927-198610 METERS(1 part in 100,000) NAD83(86)1986-19901 METER(1 part in 100,000) HARN1990-19970.1 METER B-order (1 part in 1 million) A-order (1 part in 10 million) CORS1996 -0.01 meter0.01 meter Readjustment: Average horizontal shift: < 2.5 cm. Average ellipsoid height shift: < 2.7 cm.

8. Height Modernization Program Spatial Reference Centers Regional Leaders Lead Agency Height Modernization States Interested States 2006 - Status Primary Focus Is Accurate and Efficient Heights

10. Height Modernization Evolution Evolve to National Height Modernization effort Orthometric heights from Geoid + GNSS Ellipsoid Heights National Airborne Gravity Survey –Consistent –Homogeneous –Contemporaneous –GNSS / INS

11. Match to satellite altimeter derived ocean surface 10 km track spacing Possible Airborne Gravity Survey

12. Airborne Gravity Demonstration - 2006

13. Accessing the NSRS

14. Allow Rapid Static Solutions (OPUS-RS) (Feb ’07) –Many stations, short occupations, single file –Relax 2-hr OPUS minimum  15-min Allow Range Solutions (OPUS-GIS) –Accuracy appropriate for object –Single frequency permitted –Kinematic trajectories computed –Short occupations identified and computed OPUS Enhancements

15. Publish in NGS Data Base (OPUS-DB) –Means to share OPUS results –Publicly funded surveys  publicly available –Streamlined method for metadata input Process Projects (OPUS-Projects) –Simultaneous solutions for many stations, many days –Network adjustment –Project management –Data management OPUS Enhancements

16. State Agencies – Universities – Partnerships Spatial Reference Centers

17. Geodetic State Advisors Program 2006 - Status

18. GNSS Developments at NGS GNSS Software currently under development (GPS,GLONASS,Galileo) GNSS Absolute Antenna Calibration currently under development Encourage more GLONASS data from CORS Encourage Galileo/CORS when available OPUS  GNSS –Shorter occupation times –Better ambiguity resolution Conclusions