Data Processing

CTD

SBE official software is used for data acquisition and processing. Data are converted to .cnv files, and the process procedures are as follows:

  1. Data conversion: convert data signal to ASCII text files.
  2. Wild edit: mark extraneous values as bad flags.
  3. Filter: apply low pass filter to remove the high-frequency signal.
  4. Cell thermal mass: apply thermal mass correct.
  5. Loop edit: to mark and remove scans when the CTD is moving less than the minimum velocity.
  6. Derive: to estimate derived quantities such as salinity, density, dissolved oxygen concentration, potential temperature, etc.
  7. Bin Average: average data into 1m depth bins.
After all procedures, metadata will be inserted into a MySQL database managed by ODB.

Bottle

Our processing procedures are described below:

  1. Data digitized: digitize handwritten data.
  2. Missing data: Often, missing data are denoted with NaN, N/A, or blank cells. Our default missing data identifier is "NULL".
  3. Quality control: apply data quality control tests that identify suspicious data.
  4. Merge Data: combine data from the identical cruise into one collection.
  5. Sore data in the database.

ODB
MARINE CHEMISTRY

No.1, Sec. 4, Roosevelt Road, Taipei 106 ,Taiwan
Institute of Oceanography, NTU

Phone +886-2-2363-6450#117
Email: yehtc@ntu.edu.tw

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