Sea-Bird Spectra File Format
The ASCII spectra files in the Sea-Bird format have file names based on deployment number and gauge location - Inlet gauge (S=Shallow) Outside gauge (D=Deep). For example the file for the inlet gauge on deployment #3 is named OI_SbSpec_3S.txt. These files have a 2 line header with spectral statistics followed by lines of spectra data.
The first line contains (starting with a '*'):
|
Item # |
Description |
|---|---|
|
1 |
Burst number |
|
2 |
Start of wave burst, seconds since 1 Jan 1989 (+ 3 days)* |
|
3 |
Wave integration time |
|
4 |
Number of points in wave burst |
|
5 |
Number of spectral estimates in each frequency band |
|
6 |
Water depth (m) |
|
7 |
Pressure sensor depth (m) |
|
8 |
Density (kg/m3) |
|
9 |
Chi-squared confidence interval (percent) |
|
10 |
Multiplier for Chi-squared lower bound |
|
11 |
Multiplier for Chi-squared upper bound |
*Add 3 days since Sea-Bird program did not account for leap days (259200s).
The second line contains:
|
Item # |
Description |
|---|---|
|
1 |
Number of frequency bands calculated |
|
2 |
Frequency of the first frequency band (Hz) |
|
3 |
Interval between frequency bands, delta-f, (Hz) |
|
4 |
Total variance (m2 ) |
|
5 |
Total energy (Joules/m2 ) |
|
6 |
Significant period (s) |
|
7 |
Significant wave height (m) |
Subsequent lines have the auto-spectral density for each frequency (m2/Hz).