goes_ortho.rad#

Functions for converting GOES ABI Radiance values

rad.abi_radiance_wavenumber_to_wavelength(goes, channel, rad_wn)[source]#

Convert GOES ABI Radiance units from [mW / m^2 sr cm^-1] to [W / m^2 sr um]

Parameters

goes (int) – 16, 17, or 18 to select GOES-16, GOES-17, or GOES-18
channel (int) – 1-16 to select GOES ABI channel/band
rad_wn (float, np.array, or xarray.DataArray) – GOES ABI Radiance in “wavenumber” units [mW / m^2 sr cm^-1]

Returns

rad_wl – GOES ABI Radiance in “wavelength” units [W / m^2 sr um]

Return type

float, np.array, or xarray.DataArray

Examples

rad.goesBrightnessTemp(rad, fk1, fk2, bc1, bc2)[source]#

Convert Radiance to Brightness Temperature for GOES-R ABI emissive bands (7-16)

Parameters

rad (float, np.array, or xarray.DataArray) – radiance [mW / m^2 sr cm^-1]
fk1 (float) – Planck function coefficient 1, from GOES ABI product metadata
fk2 (float) – Planck function coefficient 2, from GOES ABI product metadata
bc1 (float) – spectral response function offset correction term, from GOES ABI product metadata
bc2 (float) – spectral response function scale correction term, from GOES ABI product metadata

Returns

Tb – brightness temperature [K]

Return type

float, np.array, or xarray.DataArray

Examples

rad.goesReflectance(rad, kappa)[source]#

Convert Radiance to Reflectance for GOES-R ABI reflective bands (1-6)

Parameters

rad (float, np.array, or xarray.DataArray) – radiance [mW / m^2 sr cm^-1]
kappa (float) – incident Lambertian equivalent radiance, from GOES ABI product metadata

Returns

ref – reflectance factor

Return type

float, np.array, or xarray.DataArray

Examples

rad.makeABIrgb_fromReflectance(R_ref, G_ref, B_ref, gamma=2.2, green_coefficients={'blue': 0.45, 'nir': 0.1, 'red': 0.45})[source]#

Create RGB images given GOES-R ABI Channel 01, 02, and 03 datasets. Adapted from https://github.com/daniellelosos/True-Color-Image_GOES-R-ABI-L1b-Radiances

Parameters

R_ref (np.ndarray) – Red band data from GOES ABI (Channel 2)
G_ref (np.ndarray) – “Green” band data from GOES ABI (Channel 3) (ABI does not have a true green band, instead we can use the NIR “Veggie” band)
B_ref (np.ndarray) – Blue band data from GOES ABI (Channel 1)
gamma (float) – Gamma correction to adjust brightness of output image, defaults to gamma=2.2
green_coefficients (dict) – Dictionary of multipliers for the red, nir, and blue bands to create a synthetic green band, defaults to green_coefficients={‘red’: 0.45, ‘nir’: 0.1, ‘blue’: 0.45}

Returns

Examples