1.5.1.1.7.1.5. polar2grid.readers.agri_fy4a_l1 module

The AGRI FY-4A L1 Reader operates on Level 1 (L1) HDF5 files for the Advanced Geostationary Radiation Imager (AGRI) instrument on board the Feng-Yun - 4 (FY-4A) satellite. Geo2Grid determines if it supports files based on the input filename. Files for AGRI supported by Geo2Grid usually have the following naming scheme:

FY4A-_AGRI--_N_DISK_1047E_L1-_FDI-_MULT_NOM_20220117000000_20220117001459_0500M_V0001.HDF

The AGRI L1 reader supports all instrument spectral bands, identified in Geo2Grid as the products shown in the table below. The AGRI L1 reader for FY-4A can be provided to the main geo2grid.sh script using the -r option and the reader name agri_fy4a_l1.

The list of supported products includes true and natural color imagery. These are created by means of a python based atmospheric Rayleigh scattering correction algorithm that is executed as part of the Geo2Grid AGRI L1 reader, along with sharpening to the highest spatial resolution. For more information on the creation of RGBs, please see the RGB section.

Product Name	Description
C01	Channel 1 (0.47um) Reflectance Band
C02	Channel 2 (0.65um) Reflectance Band
C03	Channel 3 (0.83um) Reflectance Band
C04	Channel 4 (1.37um) Reflectance Band
C05	Channel 5 (1.61um) Reflectance Band
C06	Channel 6 (2.25um) Reflectance Band
C07	Channel 7 (3.75um) Brightness Temperature Band
C08	Channel 8 (3.75um) Brightness Temperature Band
C09	Channel 9 (6.25um) Brightness Temperature Band
C10	Channel 10 (7.10um) Brightness Temperature Band
C11	Channel 11 (8.5um) Brightness Temperature Band
C12	Channel 12 (10.7um) Brightness Temperature Band
C13	Channel 13 (12.0um) Brightness Temperature Band
C14	Channel 14 (13.5um) Brightness Temperature Band
true_color	Ratio sharpened rayleigh corrected true color
natural_color	Ratio sharpened corrected natural color
ash	Ash RGB
dust	Dust RGB
fog	Fog RGB

class polar2grid.readers.agri_fy4a_l1.ReaderProxy(scn: Scene, user_products: list[str])

Bases: ReaderProxyBase

Provide Polar2Grid-specific information about this reader’s products.

get_all_products() → list[str]

Get all polar2grid products that could be loaded.

get_default_products() → list[str]

Get products to load if users hasn’t specified any others.

is_geo2grid_reader: bool = True

polar2grid.readers.agri_fy4a_l1.add_reader_argument_groups(parser: ArgumentParser, group: Optional[_ArgumentGroup] = None) → tuple[Optional[argparse._ArgumentGroup], Optional[argparse._ArgumentGroup]]

Add reader-specific command line arguments to an existing argument parser.

If group is provided then arguments are added to this group. If not, a new group is added to the parser and arguments added to this new group.