UCD1 is part of the Bay Area Regional Deformation (BARD) Northern California Continuous GPS Network of the Bay Area Regional Deformation, part of the Northern California Earthquake Data Center (NCEDC).
The UCD1 continuous station consists of a Trimble Choke Ring antenna, Trimble 4000 SSi GPS receiver, Uninterruptable Power Supply (UPS), and 12 V DC gel cell battery backup. Typical receiver logging rate is 15 seconds.
Daily files contain data continuously recorded at the receiver logging rate. Files are named ucd1jjjx.dyy, where jjj is the julian day, x is an index value if multiple files were created on the same julian day, d signifies daily file, and yy are index values (usually 00). When one julian ends, a new daily file will be created and receiver data will be written to the new daily file. Raw files are moved to tape approximately twice a year. Contact Dr. Louise Kellogg if you are interested in daily raw file not available on the ftp site above.
Available from BARD are raw files and RINEX daily files (30 second interval). Upon request, RINEX files at different sampling intervals can be processed. Raw daily files are not made available until after the end of the previous UTC day. If you need immediate raw data, use the UCD1 ftp site above.
The most current log file is available here
Log name convention according to IGS is xxxxyymm where xxxx is the 4-digit station ID, yy is the last 2 digits of the year the log was prepared, and mm is the 2 digits of the month the log was prepared.
IGS standards are presented here.
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