The easiest way to obtain the ctd.py module used in previous posts is to download the source code for the oceans python module and add the python-oceans/oceans directory to your PYTHONPATH similar to what we done for the python-gsw.

To clone the repository using mercurial type:

hg clone https://code.google.com/p/python-oceans/

and to update:

hg pull
hg update

Now you can import the pandas modified DataFrame and load CTD (SeaBird CNV and FSI ASCII formats) and XBT (EDF) files directly.

from oceans.ctd import DataFrame
seabird_cast = DataFrame.from_cnv(fname)
fsi_cast = DataFrame.from_fsi(fname)
xbt = DataFrame.from_edf(fname)

The available methods are:

• split: Separate upcast from downcast.
• plot_vars: Plot two variables together (usually Salinity and Temperature).
• swap_index: Change the index (usually from pressure to depth or scan count).
• press_check: Check for pressure inversions.
• get_maxdepth: Cast maximum depth.
• plot_section: If the DataFrame is a collection of CTD stations this plot the section.

There is also a modified pandas Series (1D DataFrames) with the following methods:

• plot: Plot the CTD profile.
• smooth: Smooth the profile.
• despike: Remove spikes from the data.
• bindata: Performs a bin average.