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The file-name modifiers include ensemble averaging, the string '-EchoView' (to avoid any possible confusion with other CSV products), the echosounder channel centre frequency and data type: (one of) pitch, roll, sv (Volume Backscatter), ts (Target Strength), raw (uncalibrated).
Oceans 3.0 API filter: extension=csv
ASL .01a raw binary data files
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We seek feedback on this data product. It is difficult to test and evaluate. Hopefully it is compatible with your software and uses. Please contact us if you need any support or would like to suggest changes.
Oceans 3.0 API filter: extension=01a
Plots: PNG and PDF
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There are two variations of plots in terms of duration, depending on the ensemble period option selected. Daily plots are generated with the default , (no averaging, ) option. Daily plots will show a maximum of one day of data per plot. For all plots, the data has to be resampled so that an ensemble or raw ping corresponds to the width of at least one pixel in the PNG (ideally one to one), otherwise rendering the image will alias the data; so in spite of selecting the no-averaging option, some resampling may happen. This resampling is important as normal resizing on computer screens applies linear image anti-aliasing routines which are not appropriate for logarithmic scale images. The minimum ensemble period for a one day plot is ~30 seconds as we have about 2560 pixels along the time axis in these plots. If you select less than one day, you can effectively zoom in and see higher temporal resolutions. Here are some examples of daily plots: first is a ZAP calibrated daily echogram with the sun elevation plot; second is a ZAP daily echogram, non-calibrated without the sun elevation plot, with a configuration change part way through the day; third is an AZFP calibration daily echogram without the sun elevation plot.
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If an ensemble period is selected by the user (other than than the none option), the plots will be multi-day plots and only one plot will be generated over the search time range (excluding configuration changes and data/memory limits, which break the plot). Ensemble averaging will be applied as selected, except when the selected ensemble period is not high enough to prevent aliasing and distortion, in which case the ensemble period will be increased automatically. Below are examples of multi-day plots from a ZAP and an AZFP with ensemble averaging set to 10 - minutes, which is easily long enough to avoid aliasing and distortion.
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