PER2021171

[jeff-jackson-dfo]

Processing Steps

Background

A new CTD data set now requires processing. Use the following workflow to properly process the CTD data set. Normally the data set is associated with a mission. The data set might only be a single profile but could be hundreds of profiles; which will impact the length of time required and the possible steps required.

Normally the CTD data is acquired using Sea-Bird Scientific instruments but might also be acquired using RBR instruments or instruments from another manufacturer.

Prep Work

• [ ] Secured a copy of the cruise report from ARC or chief scientist (if available)
• [x] Copied raw CTD data from SRC
• [ ] Copied available Autosal salinity data from SRC
• [ ] Copied available Winkler dissolved oxygen data from SRC
• [x] Obtained copy of electronic event log and/or CTD log sheets
• [ ] Obtained copies of Dry and/or Wet log sheets (if available)
• [x] Latest version of CTDDAP software installed; along with supported version of Sea-Bird data processing software
• [x] Latest versions of MATLAB®, R, RStudio, and Python available on Software Center installed

Processing Steps

• Step 1 - Compute Calibrations

  • [ ] Obtained R script templates used for calibrations
  • [ ] Computed new linear correction for CTD conductivity sensor(s)
  • [ ] Computed new Soc correction for CTD dissolved oxygen sensor(s)

• Step 2 - Apply Calibrations

  • [ ] Copied old CTD configuration files (CON or XMLCON) and updated with revised sensor calibrations
  • [x] Reprocessed CTD data using CTDDAP and new CON files

• Step 3 - Update Metadata

  • [x] Ran the MATLAB® script _output_ctd_headerinfo on calibrated ODF files
  • [x] Opened header.txt in Microsoft Excel
  • [x] Inspected metadata for required updates
  • [x] Copied and edited MATLAB® template for updating metadata
  • [x] Applied pH linear correction (if provided by tracer group)

• Step 4 - Add Quality Flag Fields and Run Automated Checks

  • [x] Executed the MATLAB® script _add_qfs_toodf to add quality flag fields to the ODF files and run automated quality control checks

• Step 5 - Consult with Physical Scientist

  • [x] Physical scientist given copy of calibrated ODF files
  • [x] Physical scientist evaluated data quality (e.g. using Temperature-Salinity plots)
  • [x] Physical scientist provided feedback on data quality

• Step 6 - Visually Inspect Data

  • [x] Copied RMarkdown template and updated it for current mission
  • [x] Knitted RMarkdown file to produce HTML file
  • [x] Opened HTML file containing profile plots to do a quick visual inspection
  • [x] Ran the MATLAB® script _odfqc to visual inspect CTD profiles one at a time and assign flags to suspect data points Note: Operator should refer to physical scientist feedback and report produced from automated checking to help make judgements on suspect data points

• Step 7 - Make Final Metadata Updates

  • [x] (if required) Executed a MATLAB® script to do some final updates (e.g. documenting that the secondary sensor data should be used instead of the primary sensor data) to the ODF file metadata

• Step 8 - Archive Data and Email Notification

  • [x] Copied files to SRC
  • [x] Loaded files into ODF_ARCHIVE database
  • [x] Notified data archivist and respective data manager

[jeff-jackson-dfo]

CTD data provided by Nick Jeffery.

[yc-hu]

The processing / re-processing was finished.