[IGSMAIL-4317]: Real Time Data
Yehuda Bock
ybock at igpp.ucsd.edu
Thu Mar 20 11:20:53 PST 2003
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IGS Electronic Mail 20 Mar 11:18:17 PST 2003 Message Number 4317
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Author: Yehuda Bock
There is an effort underway to upgrade continuous GPS sites in
California to high-rate (1Hz) sampling, low-latency (<1 sec) data
dissemination ("real-time") as collaboration between the California
Spatial Reference Center (CSRC) and the scientific arrays (e.g.,
BARD, SCIGN). There are numerous scientific, societal, and commercial
benefits to real-time data.
SOPAC is actively collecting and archiving real-time data from two
dense SCIGN sub-networks in southern California. The first network
includes sites in Orange County (9 sites of the Orange County Real
Time Network, with 2 more built but not yet on line), one site in San
Diego County (SIO5), and 7 sites in Riverside County to monitor
deformation of three earthen dams at Diamond Valley Lake (DVL),
operated by the Metropolitan Water District. The OCRTN is now
operational and data are now being used by surveyors for wireless,
multiple-station RTK. Typical station spacing is 15 km for OCRTN and
several hundred meters to 8 km for DVL.
Real-time data from all sites (except DVL) can be accessed through
assigned IP and port numbers. In order to access the data in real
time you will need to register your incoming IP number with SOPAC
(please contact me at ybock at ucsd.edu, until further notice). Data are
available in both binary Ashtech MBEN and RTCM version 2.2.formats.
We have performed a transatlantic test of this capability with Georg
Weber of BKG. Thanks Georg.
The high-rate (1 Hz) MBEN data for all sites (including DVL) can be
found at ftp://garner.ucsd.edu/pub/highrate/cache/raw/. These data
are copied to the archive every 24 hours. Please note that
file-naming conventions may change as we develop the system.
There is a weekly real time data report on the SOPAC site
(http://sopac.ucsd.edu/cgi-bin/showRealTimeReport.cgi) that indicates
which data are available, and when new sites come on line. This
report is updated every few hours.
Any feedback will be appreciated.
Acknowledgments: John Canas and Art Andrew (Orange County), Cecilia
Whitaker and Mike Duffy (DVL), SCIGN, and CSRC.
--
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Yehuda Bock e-mail: ybock at ucsd.edu
Research Geodesist Phone: (858) 534-5292
& Senior Lecturer Fax: (858) 534-9873
WWW: http://sopac.ucsd.edu/; http://csrc.ucsd.edu/
Director, Scripps Orbit and Permanent Array Center (SOPAC)
Director, California Spatial Reference Center (CSRC)
Address:
University of California San Diego
9500 Gilman Drive
Institute of Geophysics and Planetary Physics, Code 0225
La Jolla, CA 92093-0225
FedEx Address:
Cecil H. and Ida M. Green Institute of Geophysics and Planetary Physics
Scripps Institution of Oceanography
8785 Biological Grade, Room 4208
La Jolla, CA 92037
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