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The Scripps Orbit and Permanent Array Center (SOPAC) is located at the Cecil H. and Ida M. Green Institute of Geophysics and Planetary Physics (IGPP), Scripps Institution of Oceanography (SIO), University of California, San Diego (UCSD) in La Jolla, California. SOPAC's primary scientific role is to support high precision geodetic and geophysical measurements using Global Positioning System (GPS) satellites, particularly for the study of earthquake hazards, tectonic plate motion, plate boundary deformation, and meteorological processes. SOPAC investigators also conduct research on the implementation, operation and scientific applications of continuously monitoring GPS arrays and Synthetic Aperture Radar (SAR) interferometry.
SOPAC is a major participant in the International GPS Service (IGS), serving as a Global Data Center and a Global Analysis Center. SOPAC is the archive for the 250-station Southern
California Integrated GPS Network (SCIGN), as well as an analysis center and a data retrieval facility. SOPAC maintains an archive of regional continuous GPS data for UNAVCO, Inc. focusing on the Western North America plate boundary and is developing a seamless
archive interface for UNAVCO. SOPAC performs research and provides operational support for NOAA's Forecast Systems Laboratory (FSL) real-time GPS meteorology project for short-term weather forecasting. SOPAC also provides essential infrastructure support for the California Spatial Reference Center (CSRC), a partnership with the National Geodetic Survey (NGS).
SOPAC provides precise, rapid, ultra-rapid, and hourly orbits for the International GPS Service (IGS) and NOAA's Forecast Systems Laboratory (FSL). Many GPS-related services and tools are available from the SOPAC Web site, such as SCOUT (an ITRF Coordinates Generator; 15 minute turnaround time), Site Information Manager (SIM), and a utility to check for unused 4-character site codes. SOPAC archives 24-hour RINEX data from about 800 continuous GPS sites from more than 20 scientific networks around the world, including the 250-station Southern California Integrated GPS Network (SCIGN). SOPAC also helps maintain the operational center for the California Spatial Reference Center (CSRC). The CSRC provides California's geodetic framework for scientific, surveying, engineering, and geographical information systems in partnership with the National Geodetic Survey and Caltrans. SOPAC also collects and archives high-rate (1 Hz), low latency (1-2 seconds) GPS data from stations in California.
World Wide Web: http://sopac.ucsd.edu
ftp archive: ftp://garner.ucsd.edu
http archive: http://garner.ucsd.edu
Scientists In Charge:
Yehuda Bock, Director
Peng Fang
Room 4208, 4108
8785 Biological Grade
Institute of Geophysics and Planetary Physics
Scripps Institution of Oceanography
La Jolla, CA 92037
Tel: (858) 534-5292, (858) 534-2445
FAX: (858) 534-9873
E-mail: ybock-at-ucsd.edu
pfang-at-ucsd.edu
Staff information: personnel, office locations
SOPAC Help Desk
SOPAC provides the following services and products to the scientific community:
- Precise near real-time and predicted GPS satellite orbits,
- Precise polar motion and Earth rotation variations,
- On-line GARNER data archive of continuously operating GPS tracking stations, for data collected since 1990,
- Time series of daily three-dimensional positions for the global and California stations with respect to the International Terrestrial Reference Frame (ITRF),
- Software for remote downloading of continuous GPS data,
- Consultation on installation and operations of continuous GPS arrays.
Data from the GARNER archive may be retrieved via http, ftp, or through the SOPAC home page:
- http or ftp to "garner.ucsd.edu"
- login: anonymous; password: your email address
- directories: rinex, raw, products, regional, global
Access is intended for non-commercial users. Commercial users please post to the contact the SOPAC Help Desk. There are no user fees, though acknowledgments are appreciated.
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