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The default value is no averaging, meaning the data is not altered. Some echosounders are configured to do ping averaging during acquisition, so the data you request with this option could already be averaged. To determine if the echosounder is averaging data as it is acquiring, check the device details page (e.g. http://dmas.uvic.ca/DeviceListing?DeviceId=22608, go to the additional attributes tab) or check the data products: see the comment field in the plots or the Config structure in mat files. Available ensemble periods are 1, 10, 15 and 60 minutes.
Calibration
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This option will apply the calibration to the data, when the calibration coefficients are available. The calibration calculation and coefficients are supplied by the manufacturer. See the device details page (additional attributes tab) to see the coefficients, see the instrument documentation page, or [contact us|http://www.oceannetworks.ca/about-us/contact-us] for more details. These values are also provided in the mat file Config / Cal structure - see the \[24#Config.Cal\] [ASL data product page|DP:24] for more information. |
The default value is to apply calibration when available. The alternative option will provide the raw data only. Raw data has units of raw counts, which are proportional to the received acoustic pressure.