eradiate.radprops.CKDAbsorptionDatabase

class eradiate.radprops.CKDAbsorptionDatabase(dir_path, index, spectral_coverage, metadata=NOTHING, lazy=False, cache=NOTHING)[source]

Bases: AbsorptionDatabase

Absorption coefficient database (CKD variant).

See also

AbsorptionDatabase

cache_clear()

Clear the cache.

cache_close()

Close all cached datasets.

cache_reset(maxsize)

Reset the cache with the specified maximum size.

static convert(value)

Attempt conversion of a value to an absorption database.

Parameters:

value – The value for which conversion is attempted.

Returns:

MonoAbsorptionDatabase or CKDAbsorptionDatabase

Notes

Conversion rules are as follows:

  • If value is a string, try converting using the from_name() constructor. Do not raise if this fails.

  • If value is a string or a path, try converting using the from_directory() constructor. The returned type is consistent with the active mode.

  • If value is a dict, try converting using the from_dict() constructor. The returned type is consistent with the active mode.

  • Otherwise, do not convert.

static default()

Return a default database, depending on the active mode.

Defaults are as follows:

  • Monochromatic: "komodo"

  • CKD: "monotropa"

Returns:

AbsorptionDatabase

eval_sigma_a_ckd(w, g, thermoprops, error_handling_config=None)[source]

Compute the absorption coefficient given spectral coordinates and a thermophysical profile (CKD variant).

Parameters:

  • w (quantity) – The wavelength for which the absorption coefficient is evaluated.

  • g (float) – The g-point for which the absorption coefficient is evaluated.

  • thermoprops (Dataset) – The thermophysical profile for which the absorption coefficient is evaluated.

  • error_handling_config (ErrorHandlingConfiguration, optional) – The error handling policy applied if corrdinates are missing, do not have the appropriate dimension or are out of the dataset’s bounds. If unset, the default policy specified by the absorption_dataset.error_handling setting is applied.

Returns:

DataArray – A data array containing the evaluated absorption coefficient as a function of the spectral coordinate and altitude.

See also

eradiate.config

eval_sigma_a_mono(w, thermoprops, error_handling_config=None)

Compute the absorption coefficient given spectral coordinates and a thermophysical profile (mono variant).

Parameters:

  • w (quantity) – The wavelength for which the absorption coefficient is evaluated.

  • thermoprops (Dataset) – The thermophysical profile for which the absorption coefficient is evaluated.

  • error_handling_config (ErrorHandlingConfiguration, optional) – The error handling policy applied if corrdinates are missing, do not have the appropriate dimension or are out of the dataset’s bounds. If unset, the default policy specified by the absorption_dataset.error_handling setting is applied.

Returns:

DataArray – A data array containing the evaluated absorption coefficient as a function of the spectral coordinate and altitude.

See also

eradiate.config

classmethod from_dict(value)[source]

Construct from a dictionary. The dictionary has a required entry "construct" that specifies the constructor that will be used to instantiate the database. Additional entries are keyword arguments passed to the selected constructor.

Parameters:

value (dict) – Converted value.

Returns:

AbsorptionDatabase

classmethod from_directory(dir_path, lazy=False, fix=True)

Initialize a CKD database from a directory that contains one or several datasets.

Parameters:

  • dir_path (path-like) – Path where the CKD database is located.

  • lazy (bool) – Access mode switch: if True, load data lazily; else, load data eagerly.

  • fix (bool) – If True, attempt generating missing index files upon initialization. Otherwise, raise if they are missing.

Returns:

AbsorptionDatabase

Raises:

FileNotFoundError – If an index file is missing and fix is False.

static from_name(name, **kwargs)

Initialize a database from a name.

Parameters:

  • name (path-like) – Name of the requested CKD database.

  • kwargs – Additional keyword arguments are forwarded to the from_directory() constructor.

Returns:

AbsorptionDatabase

load_dataset(fname)

Convenience method to load a dataset. This method is decorated with functools.lru_cache() with maxsize=1, which limits the number of reload events when repeatedly querying the same file.

The behaviour of this method is also affected by the lazy parameter: if lazy is False, files are loaded eagerly with xarray.load_dataset(); if lazy is True, files are loaded lazily with xarray.open_dataset().

Parameters:

fname (str) – Name of the file that is to be loaded.

Returns:

Dataset

lookup_datasets(**kwargs)

Perform a dataset lookup based on the requested spectral coordinate. See lookup_filenames() for the accepted arguments.

lookup_filenames(**kwargs)

Look up a filename in the index table from the coordinate values passed as keyword arguments.

Parameters:

  • wl (quantity or array-like, optional) – Wavelength (scalar or array, quantity or unitless). If passed as a unitless value, it is interpreted using the units of the wavelength chunk bounds.

  • wn (quantity or array-like, optional) – Wavenumber (scalar or array, quantity or unitless). If passed as a unitless value, it is interpreted using the units of the wavenumber chunk bounds.

Returns:

filenames (list of str) – Names of the successfully looked up files, relative to the database root directory.

Raises:

ValueError – If the requested spectral coordinate is out of bounds.

Notes

Depending on the specified keyword argument (wl or wn), the lookup will be performed in wavelength or wavenumber mode. Both are equivalent.

property dir_path
Returns:

Path – Database root path.

property metadata
Returns:

dict – Database metadata.

property spectral_coverage
Returns:

DataFrame – Spectral coverage table.