SpectralRadianceUnitType

class pyarts.arts.SpectralRadianceUnitType(*args, **kwargs)

Group name: “SpectralRadianceUnitType”

Choice of spectral radiance unit in conversions.

The conversion to one of these units is expected to happen from the internal representation of spectral_radiance, which is [W / m \(^{2}\) Hz sr].

For the description below, \(c\) is the speed of light, \(k\) is the Boltzmann constant, \(f\) is the frequency, \(h\) is the Planck constant, \(F(x)\) is the conversion function, and \([I,\; Q,\; U,\; V]\) is the internal representation of spectral_radiance.

For Rayleigh-Jeans brightness temperature the conversion is:

\[[I,\; Q,\; U,\; V] \rightarrow [F(I),\; F(Q),\; F(U),\; F(V)]\]
\[F(x) = \frac{c^2 x}{2 k f^2}.\]

For Planck brightness temperature the conversion is:

\[[I,\; Q,\; U,\; V] \rightarrow \left[ F(I),\; F\left( \frac{I + Q}{2} \right) - F\left( \frac{I - Q}{2} \right),\; F\left( \frac{I + U}{2} \right) - F\left( \frac{I - U}{2} \right),\; F\left( \frac{I + V}{2} \right) - F\left( \frac{I - V}{2} \right) \right]\]
\[F(x) = \frac{h f}{k}\left[\log\left(1 + \frac{2hf^3}{c^2x}\right)\right]^{-1}.\]

The spectral radiance per wavelength [W / m \(^{2}\) m sr] is:

\[[I,\; Q,\; U,\; V] \rightarrow [F(I),\; F(Q),\; F(U),\; F(V)]\]
\[F(x) = \frac{f^2 x}{c}.\]

The spectral radiance per wavenumber [W / m \(^{2}\) m \(^{-1}\) sr] is:

\[[I,\; Q,\; U,\; V] \rightarrow [F(I),\; F(Q),\; F(U),\; F(V)]\]
\[F(x) = \frac{x}{c}.\]

Lastly, the unit option of course just retains the current state [W / m \(^{2}\) Hz sr].

\[[I,\; Q,\; U,\; V] \rightarrow [I,\; Q,\; U,\; V].\]

Valid options:

  • "RJBT" or "Tr": Rayleigh-Jeans brightness temperature [K]

  • "PlanckBT" or "Tb": Planck brightness temperature [K]

  • "W_m2_m_sr" or "W/(m^2 m sr)": Spectral radiance wavelength [W / m \(^{2}\) m sr]

  • "W_m2_m1_sr" or "W/(m^2 m-1 sr)": Spectral radiance wavenumber [W / m \(^{2}\) m \(^{-1}\) sr]

  • "unit" or "1": Unit spectral radiance [W / m \(^{2}\) Hz sr]

Workspace variables of type SpectralRadianceUnitType

Overview

Method

readxml()

Read variable from file

Method

savexml()

Saves variable to file

Static Method

fromxml()

Create variable from file

Static Method

get_options()

Get a list of all options

Static Method

get_options_as_strings()

Get a list of all options as strings

Static Data

pyarts.arts.SpectralRadianceUnitType.PlanckBT

“PlanckBT” - SpectralRadianceUnitType

Static Data

pyarts.arts.SpectralRadianceUnitType.RJBT

“RJBT” - SpectralRadianceUnitType

Static Data

pyarts.arts.SpectralRadianceUnitType.Tb

“PlanckBT” - SpectralRadianceUnitType

Static Data

pyarts.arts.SpectralRadianceUnitType.Tr

“RJBT” - SpectralRadianceUnitType

Static Data

pyarts.arts.SpectralRadianceUnitType.W_m2_m1_sr

“W_m2_m1_sr” - SpectralRadianceUnitType

Static Data

pyarts.arts.SpectralRadianceUnitType.W_m2_m_sr

“W_m2_m_sr” - SpectralRadianceUnitType

Static Data

pyarts.arts.SpectralRadianceUnitType.unit

“unit” - SpectralRadianceUnitType

Operator

__eq__()

self == other

Operator

__ge__()

self >= other

Operator

__getstate__()

__getstate__(self) -> tuple[str]

Operator

__gt__()

self > other

Operator

__hash__()

Allows hashing

Operator

__le__()

self <= other

Operator

__lt__()

self < other

Operator

__ne__()

self != other

Operator

__setstate__()

__setstate__(self, arg: tuple[str], /) -> None

Constructors

__init__(self) None
__init__(self, arg: pyarts.arts.SpectralRadianceUnitType) None
__init__(self, arg: str, /) None

Methods

readxml(self, file: str) None

Read variable from file

Parameters:

file (str) – A file that can be read

On Error:

Throws RuntimeError for any failure to read

savexml(self, file: str, type: str = 'ascii', clobber: bool = True) None

Saves variable to file

Parameters:
  • file (str) – The path to which the file is written. Note that several of the options might modify the name or write more files

  • type (str) – Type of file to save. See FileType for options.

  • clobber (bool) – Overwrite existing files or add new file with modified name?

On Error:

Throws RuntimeError for any failure to save

Static Methods

fromxml(file: str) pyarts.arts.SpectralRadianceUnitType

Create variable from file

Parameters:

file (str) – A file that can be read

On Error:

Throws RuntimeError for any failure to read

get_options() list[pyarts.arts.SpectralRadianceUnitType]

Get a list of all options

get_options_as_strings() list[str]

Get a list of all options as strings

Operators

__eq__(self, arg: pyarts.arts.SpectralRadianceUnitType, /) bool

self == other

__ge__(self, arg: pyarts.arts.SpectralRadianceUnitType, /) bool

self >= other

__getstate__(self) tuple[str]
__gt__(self, arg: pyarts.arts.SpectralRadianceUnitType, /) bool

self > other

__hash__(self) int

Allows hashing

__le__(self, arg: pyarts.arts.SpectralRadianceUnitType, /) bool

self <= other

__lt__(self, arg: pyarts.arts.SpectralRadianceUnitType, /) bool

self < other

__ne__(self, arg: pyarts.arts.SpectralRadianceUnitType, /) bool

self != other

__setstate__(self, arg: tuple[str], /) None