db2sac [-i] [-sc sta-cha] [-ts start-time] [-te end-time] [-w wf_dir] [-gap {none | zero | interp}] [-counts] input_db output_db db2ah [-sc sta-cha] [-ts start-time] [-te end-time] [-w wf_dir] [-gap {none | zero | interp}] [-counts] input_db output_db
db2sac and db2ah are conversion utilities which convert CSS format waveform files into SAC or AH format, and also create a new CSS wfdisc table incorporating these files. Note that this new CSS wfdisc table is consistent with all the other tables in original database, and programs which use a CSS database should continue to run.
The newly created AH files are architecture independent xdr ah files.
Each CSS database can create a number of SAC/AH files. These files are named using the following convention:
YYYYJJJHHMMSS.SS.STN.CHAN
Where the fields have the following meanings:
YYYY Year |
JJJ Julian Day |
HH Hour |
MM Minute |
SS.SSSS Seconds.Fractional-Seconds |
STN Station |
CHAN Channel |
Station and channel may each be either explicit names, "*", or a regular expression in the style of egrep(1).station:channel,station:channel,...
% db2ah -sc CHM:HHZ -ts 1/20/92 -te 1/30/92 knet.1992.jan-apr ah Translating... Writing: 1992028045438.50.CHM.HHZ Writing CHM, HHZ, 6200 samples, starting 1992 028 04:54:38:5000 UT Translating... Writing: 1992029060349.50.CHM.HHZ Writing CHM, HHZ, 6200 samples, starting 1992 029 06:03:49:5000 UT Translating... Writing: 1992029075333.00.CHM.HHZ Writing CHM, HHZ, 6600 samples, starting 1992 029 07:53:33:0000 UT Translating... Writing: 1992029080238.50.CHM.HHZ Writing CHM, HHZ, 13450 samples, starting 1992 029 08:02:38:5000 UT Translating... Writing: 1992029081530.00.CHM.HHZ Writing CHM, HHZ, 6400 samples, starting 1992 029 08:15:30:0000 UT Translating... Writing: 1992029082145.50.CHM.HHZ Writing CHM, HHZ, 5300 samples, starting 1992 029 08:21:45:5000 UT % ls ah* ah.wfdisc ah: 1992028045438.50.CHM.HHZ 1992029080238.50.CHM.HHZ 1992029060349.50.CHM.HHZ 1992029081530.00.CHM.HHZ 1992029075333.00.CHM.HHZ 1992029082145.50.CHM.HHZ % db2sac -sc "AAK:*" demo sac Translating... Writing AAK, BHZ, 2249 samples (BINARY), starting 1992 138 21:55:10:2500 UT Translating... Writing AAK, BHN, 2249 samples (BINARY), starting 1992 138 21:55:10:2500 UT Translating... Writing AAK, BHE, 2249 samples (BINARY), starting 1992 138 21:55:10:2500 UT % ls sac* sac.wfdisc sac: 1992138215510.25.AAK.BHE 1992138215510.25.AAK.BHN 1992138215510.25.AAK.BHZ
Eric Winkelman Daniel Quinlan