Quality Control of CTD profiles
Project description
This package is intended to quality control CTD stations by applying a sequence of tests. It uses the Seabird package to interpret the SeaBird’s .cnv output file.
This is the result from several generations of quality control systems, which started in 2006, while I was in charge of the quality control of termosalinographs at AOML-NOAA, USA. Later I was advising the quality control of the brazilian hydrography of PIRATA.
Quick howto
First load the CTD data
pqc = cotede.qc.fProfileQC(‘example.cnv’)
The keys() will give you the data loaded from the CTD, simillar to the output from the seabird.fCNV
pqc.keys()
To see one of the read variables listed on the previous step
pqc[‘temperature’]
The flags are stored at pqc.flags and is a dictionary, being one item per variable evaluated. For example, to see the flags for the secondary salinity instrument, just do
pqc.flags[‘salinity2’]
or for a specific test
pqc.flags[‘salinity2’][‘gradient’]
The class cotede.qc.ProfileQCed is equivalent to the cotede.qc.ProfileQC, but it already mask the non approved data (flag != 1). Another it can also be used like
from seabird import cnv data = cnv.fCNV(‘example.cnv’)
import cotede.qc ped = cotede.qc.ProfileQCed(data)
Support and Documentation
Mmm, yeap, I have work to do here. If you have any trouble to use it, please drop a specific complain in the GitHUB issues, and I’ll do my best to respond ASAP.
How I see quality control
Quality control is different then data processing. On the processed data, the quality control/quality assurance means to check what looks fine. It is very important that the data is properly sampled and processed. The quality control procedures can’t go back on time and fix improper sampling, but only tell you that the data don’t looks fine.
Why CoTeDe?
For a long time I had this idea in mind but I only really formalize the procedure in 2013, when I spent few months Toulouse. The full name of this package is CoTe De l’eau, which I understand as something near to “rating the water”. The short name is cotede, to make easier for the users to remember, since it is the quality control of COnductivity TEmperature and DEpth (cotede). The french name is a kind of tribute to the great time that I spent in France with Bia and the croissants that were converted in code lines.
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