CTD

The CTD class provides a comprehensive interface for loading, processing, and analyzing CTD (Conductivity, Temperature, Depth) data. Below is a detailed breakdown of the key methods and functionalities provided by the CTD class.

class ctdfjorder.CTD.CTD(ctd_file_path: str)

Read your data and initialize a CTD object.

Parameters:

ctd_file_path (str) – The file path to the RSK or Castaway file.

Raises:

• RskCorruptError – When an RBR ‘.rsk’ file is unable to be opened.

• InvalidCTDFilenameError – When the filename parameter does not have ‘.rsk’ or ‘.csv’.

Examples

Castaway CTD profile with valid data .. code-block:: python

ctd_data = CTD(‘CC1531002_20181225_114931.csv’) output = ctd_data.get_df() print(output.head(3))

Data Handling

Methods for loading, accessing, and ensuring data integrity.

• get_df()

• assert_data_not_empty()

• add_metadata()

• expand_date()

Data Cleaning

Methods to clean and prepare CTD data for analysis.

• filter_columns_by_range()

• remove_non_positive_samples()

• remove_upcasts()

• clean()

Derived Calculations

Methods to calculate additional parameters and metrics from the raw CTD data.

• add_absolute_salinity()

• add_density()

• add_potential_density()

• add_mean_surface_density()

• add_surface_salinity()

• add_surface_temperature()

• add_meltwater_fraction()

• add_mld()

• add_n_squared()

• add_potential_temperature()

• add_practical_salinity()

• add_conservative_temperature()

• add_dynamic_height()

• add_thermal_expansion_coefficient()

• add_haline_contraction_coefficient()

• add_speed_of_sound()

• add_profile_classification()

Exporting Data

Methods for exporting CTD data for further analysis or sharing.

• save_to_csv