1.5.1.1.7.1.16. polar2grid.readers.mersi2_l1b module

The FY-3D MERSI2 Level 1B reader operates on Level 1B (L1B) HDF5 files.

The files come in four varieties; band data and geolocation data, both at 250m and 1000m resolution. Files usually have the following naming scheme:

tf{start_time:%Y%j%H%M%S}.FY3D-X_MERSI_1000M_L1B.{ext}

This reader’s default resampling algorithm is ewa for Elliptical Weighted Averaging resampling. The --weight-delta-max parameter is set to 40 and the --weight-distance-max parameter is set to 1.

The frontend can be specified with the polar2grid.sh command using the mersi2_l1b frontend name. The MERSI2 frontend provides the following products:

Product Name	Description	Central Wavelength (um)
1	Channel 1 Reflectance Band	0.47
2	Channel 2 Reflectance Band	0.55
3	Channel 3 Reflectance Band	0.65
4	Channel 4 Reflectance Band	0.865
5	Channel 5 Reflectance Band	1.38
6	Channel 6 Reflectance Band	1.64
7	Channel 7 Reflectance Band	2.13
8	Channel 8 Reflectance Band	0.412
9	Channel 9 Reflectance Band	0.443
10	Channel 10 Reflectance Band	0.490
11	Channel 11 Reflectance Band	0.555
12	Channel 12 Reflectance Band	0.670
13	Channel 13 Reflectance Band	0.709
14	Channel 14 Reflectance Band	0.746
15	Channel 15 Reflectance Band	0.865
16	Channel 16 Reflectance Band	0.905
17	Channel 17 Reflectance Band	0.936
18	Channel 18 Reflectance Band	0.940
19	Channel 19 Reflectance Band	1.24
20	Channel 20 Brightness Temperature Band	3.80
21	Channel 21 Brightness Temperature Band	4.05
22	Channel 22 Brightness Temperature Band	7.20
23	Channel 23 Brightness Temperature Band	8.55
24	Channel 24 Brightness Temperature Band	10.8
25	Channel 25 Brightness Temperature Band	12.0
true_color	Rayleigh corrected true color RGB	N/A
false_color	False color RGB (bands 7, 4, 3)	N/A
natural_color	Natural color RGB (bands 6, 4, 3)	N/A

class polar2grid.readers.mersi2_l1b.ReaderProxy(scn: Scene, user_products: list[str])

Bases: ReaderProxyBase

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

property _aliases: dict

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_polar2grid_reader: bool = True

polar2grid.readers.mersi2_l1b.add_reader_argument_groups(parser: ArgumentParser, group: _ArgumentGroup | None = None) → tuple[_ArgumentGroup | None, _ArgumentGroup | None]

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