satpy.readers.vii_l1b_nc module

EUMETSAT EPS-SG Visible/Infrared Imager (VII) Level 1B products reader.

The vii_l1b_nc reader reads and calibrates EPS-SG VII L1b image data in netCDF format. The format is explained in the EPS-SG VII Level 1B Product Format Specification V4A.

This version is applicable for the vii test data V2 to be released in Jan 2022.

class satpy.readers.vii_l1b_nc.ViiL1bNCFileHandler(filename, filename_info, filetype_info, **kwargs)[source]

Bases: ViiNCBaseFileHandler

Reader class for VII L1B products in netCDF format.

Read the calibration data and prepare the class for dataset reading.

static _calibrate_bt(radiance, cw, a, b)[source]

Perform the calibration to brightness temperature.

Parameters:

  • radiance – numpy ndarray containing the radiance values.

  • cw – center wavelength [μm].

  • a – temperature coefficient [-].

  • b – temperature coefficient [K].

Returns:

array containing the calibrated brightness temperature values.

Return type:

numpy ndarray

static _calibrate_refl(radiance, angle_factor, isi)[source]

Perform the calibration to reflectance.

Parameters:

  • radiance – numpy ndarray containing the radiance values.

  • angle_factor – numpy ndarray containing the inverse of cosine of solar zenith angle [-].

  • isi – integrated solar irradiance [W/(m2 * μm)].

Returns:

array containing the calibrated reflectance values.

Return type:

numpy ndarray

_perform_calibration(variable, dataset_info)[source]

Perform the calibration.

Parameters:

  • variable – xarray DataArray containing the dataset to calibrate.

  • dataset_info – dictionary of information about the dataset.

Returns:

array containing the calibrated values and all the original metadata.

Return type:

DataArray

_perform_orthorectification(variable, orthorect_data_name)[source]

Perform the orthorectification.

Parameters:

  • variable – xarray DataArray containing the dataset to correct for orthorectification.

  • orthorect_data_name – name of the orthorectification correction data in the product.

Returns:

array containing the corrected values and all the original metadata.

Return type:

DataArray