Oregon Inlet Wave Spectra - Columnar Format
The Sea-Bird Wave spectra files (columnar ASCII) have names based on deployment number and gage location - inlet (S=Shallow) and outside (D+Deep). For example, the spectra file for the inlet gauge on deployment 3 is OI_Spec_3S.txt. These files have been reformatted into columnar files for easy importation into spreadsheet programs or other analysis programs (e.g., Matlab or IDL).
The first line:
|
Column # |
Description |
|---|---|
|
1-5 |
have "1" as a place holder |
|
6-7 |
Chi-Squared 90% lower and upper limit multipliers |
|
8-43 |
frequency of each band |
Subsequent lines:
|
Column # |
Description |
|---|---|
|
1-5 |
year, month, day, time (EST), epoch time (seconds since 1 Jan 1970) |
|
6 |
Hmo (m) |
|
7 |
Peak period (s), period of frequency bans with most energy |
|
8-43 |
Auto-spectral density for each frequency (m2/Hz) |
Note: spectral density is set to 'nan' for frequencies where the spectral amplification due to linear theory surface correction exceeds 100.
Example Matlab read of deployment #3 outer (Deep) gauge.
x = load('waveSpec_3D.txt');
time_t = x(:,5); % epoch time
chiLowD = x(1,6); % Chi-squared lower limit multiplier
chiUpD = x(1,7); % Chi-squared upper limit multiplier
freqs = x(1,8:end); % Frequencies
specD=x(2:end,8:end); % Spectra
hmoD=x(2:end,6); % Hmo
tpD=x(2:end,7); % peak period