1	CORS USERS FORUM Richard Snay NOAA’s National Geodetic Survey CGSIC Meeting Fort Worth, TX September 26, 2006
2	Agenda 1:30 CORS/OPUS: Status & Overview Richard Snay, NOAA’s National Geodetic Survey 1:45 On-GRID: An Initiative to Promote Regional Real-Time GNSS Networks Gavin Schrock, City of Seattle, WA 2:05 OPUS-DB and Other OPUS-Related Innovations Rick Foote & Joe Evjen, NOAA’s National Geodetic Survey 2:25 The Texas Spatial Reference Center Gary Jeffress, Texas A&M Univ., Corpus Christi 2:45 NGS Support for Regional Real-Time GNSS Networks Neil Weston, NOAA’s National Geodetic Survey 3:05 EarthScope’s Plate Boundary Observatory: Status Update Greg Anderson, UNAVCO, Inc. 3:25 Question & Answer Session 3:45 Break 4:00 Interactive Sessions within Small Discussion Groups 5:00 End
3	Interactive Sessions (4:00 – 5:00 pm) Supporting real-time positioning Neil Weston, Giovanni Sella and Bill Henning B. OPUS Joe Evjen and Rick Foote C. Texas Spatial Reference Center Cliff Middleton and Casey Brennan D. Ionospheric models Joe Kunches E. Tropospheric models Seth Gutman
4	Continuously Operating Reference Stations
5	CORS OVERVIEW National CORS Network contains 817 sites Cooperative CORS Network contains 168 sites California CORS Network contains 350+ sites Combined CORS Network growing at rate of 15 sites per month More than 180 organizations participate in the CORS program Provides code range (C/A, P1, P2) and carrier phase observations (L1, L2)
6	CORS APPLICATIONS Postmission Static Positioning (cm-level accuracy with a few hours of data, dm-level accuracy with one minute of data) Postmission Kinematic Positioning (dm-level accuracy for an aircraft, boat, or land vehicle) Geophysics / Crustal Motion Meteorology / Water Vapor in Atmosphere Space Weather / Free Electrons in Ionosphere
7	Mexico’s National Active Geodetic Network Merges with the U.S. National CORS Network
8	NEW CORS GUIDELINES ADOPTED GOALS : Improve quality of CORS data Focus attention on CORS meta-data requirements
9	CORS ACCOMPLISHMENTS in FISCAL YEAR 2006 Combined CORS network grew by more than 180 sites. (Thanks mainly to EarthScope’s Plate Boundary Observatory and to RTK networks being established by state and local governments and by private companies.) The Online Positioning User Service (OPUS) processed 150,000 GPS data sets in FY 2006. The User-Friendly CORS (UFCORS) utility delivered 760,000 GPS data sets in FY 2006. William Stone of NGS published article describing CORS & OPUS. CORS web site now features Google maps and satellite photos of individual CORS sites. CORS data serve to quantify glacial isostatic adjustment (aka: postglacial rebound).
10	GPS-Derived Vertical Velocities
11	US-TEC Product: http://www.sec.noaa.gov/ustec
12	Future Plans for US-TEC Further increase number of stations over CONUS (including FAA-WAAS) Include all real-time IGS Canadian stations to provide accurate maps extending over Canada Increase cadence to 5 minutes and reduce latency Provide short-term forecast (10 to 30 minutes) to bring up to, or just beyond, real-time Include sites to the south (Mexico and Caribbean) Buoys over oceans Positioning validation
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16	ON THE CORS HORIZON * NOAA will determine ITRF 2005 positional coordinates and velocities for all CORS sites. * NOAA will add about 10 GPS/GLONASS receivers to CORS network. * NOAA will establish CORS sites at about 6 additional U.S. tide gauge stations. * NOAA will publish a scientific article on the use of CORS data to calibrate tide gauge data for determining absolute sea level rise.
17	Tide gauges located within 40 km of a CORS having an accurate ITRF00 velocity
18	Absolute Sea Level Change