San Francisco State University Physics and Astronomy Department
SFSU Pacific Oceanography Project
Formats of Data on PSM Data Files
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Here is the data format for the various data files involving Pioneer Seamount data.

(a b bwc c d e f r )

"b" files: Time series for one "2-hour" time block, derived from the "m" files by combining the four channels - sometimes adding all four, sometimes using only one of the channels. Files from 2001 always consist of 1801 blocks of 4096 samples; files from 2002 span an exact 2-hour interval, but the number of blocks varies by one or two.

Files with all four hydrophones added coherently are put in directories with the correct year (e.g., /2001/ or /2002/) in the path. Files with a single hydrophone have 10, 20, 30 0r 40 added to the year, giving for instance /2041/ for data from 2001 with only hydrophone 4 (of 4), and /2022/ for data from 2002 wity only hydrophone 2. Files which have been "deglitched for blue whales" have another 50 added to the year - giving, for example, /2091/ for data from 2001 with hydrophone 4 only, deglitched.

"bfit" files: results of carrying out a non-linear least- squares fit to events identified in "bwc" files. The format of these files is probably not final.

[The probable values of some of these numbers are as follows: npeaks: a few to 10,000; exits = 1101 for only second fit non-convergent; index 0 to 10,000; f0=16.00; appha = 0.045; phi0 from -4 pi to 4 pi; resw = 2x1010; nchi2 in [0,2].

"bwc" files: results of searching "c" files for blue-whale calls. The files searched are from year 2091 (or 2092). "m" files from 2001 are unpacked with only hydrophone number 4 to "b" files of year 2041. These "b" files are deglitched and rewritten as "b" files of year 2091. The deglitched "b" files are processed with the blue-whale 'B'-call matched filter to give the 'c' files. Then finally the program looks for peaks in the matched-filter output, with a dynamic noise-referenced threshold, and writes them to the 'bwc' files.

[The probable values of some of these numbers are as follows: npeaks: a few to 10,000; cday: 2,073,600,000. for day 244; cdb: 3.0 (should be more like 90. when properly normalized); ccen: 1. (will go to 90.); csig: 0.3 (will go to perhaps 5.); cthnsig, cthfx - about equal to ccen + (several)*csig.
Should be the same place as the "c" files (q.v.).

"c" files: output from blue-whale B-call detector. A quadrature matched filter for harmonics 1 and 3, linear chirp, is passed over the output from hydrophone 4, then downsampled to 10 Hz.

[The probable values of some of these numbers are as follows: dt = 100 ms; npt = 7200000/100 = 72000; lblk=100

"d" files: "detector" output for RAFOS sources

"f" files: Image files from which the jpegs are made.

"k" files: Starting times of blocks in "l" files.

Ideally "l" files should have 21095 or 21096 blocks.

"r" files: mean-square signal values, with the channels combined in various ways, downsampled to 1 Hz. ("r" stands for "rms," but the values are mean-square values.)

[The probable values of these numbers are as follows: lmsblk=1024; npt = 1801 x 4 = 7204, based on 1801 blocks of 4096 samples in a raw-data file; dt=1024/1000 sec, based on 1 kHz sampling.]

"s" files: spectral density data, from Fourier transforming the "b" files; Raw data is organized into 15-minute blocks, and 878 1.024-second chunks are fourier-transformed. The resulting power spectrum is combined with two time slices into a single 512-point array. This makes a 512x439- point array. These points are then corrected for the equalization frequency response and converted in to decibels re (1 microPascal)^2/Hz. The output is: