For hydrophone data products only (audio and spectrogram data):
Original Data
This option will cause the search to return results for original data only. Altered data is excluded. For security reasons, the military occasionally diverts seismic and acoustic data. Usually that data is returned, after a delay of 3 days to 2 months, but in an altered form. Diverted data is usually altered by band-pass filtering, often with decimation or resampling. In rare circumstances, diverted data is returned whole or is re-constituted from it's low-pass and high-pass components; this data will be returned by a search using the original data option. Data diversion is further explained in the data diversion page. For spectral probability density plots and spectrograms, 'Data Diversion Mode: Original Data' will appear in the plot title.
This is the default option.
Low Pass Filtered
This option will cause the search to return results for diverted data that has been low pass filtered only. For spectral probability density plots and spectrograms, 'Data Diversion Mode: Low Pass Filtered' will appear in the plot title.
High Pass Filtered
This option will cause the search to return results for diverted data that has been high pass filtered only. For spectral probability density plots and spectrograms, 'Data Diversion Mode: High Pass Filtered' will appear in the plot title.
File-name mode field
'HPF' or 'LPF' is added to the file-name when the quality option is set to high or low pass filtered data, i.e. ICLISTENHF1234_20110101T000000Z-HPF.wav. For spectral probability density plots only, 'All' may be added to the file-name, as these plots can join LPF, Original and HPF data together into one plot if the spectral frequency bins are the same. For brevity, 'Original' does not get added to the file-name.