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Audio data may be diverted or delayed for security reasons or bandwidth limitations. Read on below for more information. |
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On-the-fly conversion between audio formats is now disabled by default . Searches because of the tendency to fill the temporary space as noted above. With the default option, searches may return no data found for some formats while there is data in other audio formats. See "Audio Format Conversion" belowFLAC and wav formats are available as noted above. MP3 format is not recommended and is almost always generated on-the-fly. See Audio Format Conversion for more information. IOS Hydrophone Arrays always convert on-the-fly from their source raw data .hyd files to audio file products - this is slow and may also fill the temporary space. Contact us before requesting IOS Hydrophone Array audio data. |
Given the sensitive nature of hydrophone data, the military has the ability to divert the audio data as required. Diverted data is then reviewed by military authorities, and if it does not contain sensitive recordings it is returned to the ONC archive. This process usually blocks out a few days of near-live data and then the review and return takes up to 3 months (usually about a month). Diversion occurs securely at the source and ONC has no access to the data until it is reviewed and returned. The data products, Data Preview and data availability are all updated automatically when the data is returned. Because hydrophones generate multiple types of data, the data availability plot in Data Search may show available data when audio data is not available. This often indicated by the tones of the colour in the data availability plot:
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