Folders and files
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Tools to load hydrographic data into pandas DataFrame (and some rudimentary methods for data pre-processing/analysis).
This module can load SeaBird CTD (CNV), Sippican XBT (EDF), and Falmouth CTD (ASCII) formats.
pip install ctd
from ctd import DataFrame
cast = DataFrame.from_cnv('./test/data/CTD/g01l06s01.cnv.gz', compression='gzip')
downcast, upcast = cast.split()
fig, ax = downcast['t090C'].plot()
We can do better:
from ctd import DataFrame, lp_filter, movingaverage
cast = DataFrame.from_cnv('./test/data/CTD/g01l06s01.cnv.gz', compression='gzip', below_water=True)
downcast, upcast = cast.split()
temperature = downcast['t090C'].despike(n1=2, n2=20, block=100)
temperature.index = lp_filter(temperature.index.values, sample_rate=24.0, time_constant=0.15)
temperature = temperature.bindata(delta=1)
temperature = temperature.interpolate()
temperature = temperature.smooth(window_len=21, window='hanning')
fig, ax = temperature.plot()
ax.axis([0, 30, 2000, 0])
ax.set_ylabel("Pressure [dbar]")
ax.set_xlabel(u'Temperature [\u00b0C]')
Check out the IPython Notebook.
Filipe Fernandes