Source code for polar2grid.readers.mersi2_l1b
#!/usr/bin/env python3
# encoding: utf-8
# Copyright (C) 2019 Space Science and Engineering Center (SSEC),
# University of Wisconsin-Madison.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# This file is part of the polar2grid software package. Polar2grid takes
# satellite observation data, remaps it, and writes it to a file format for
# input into another program.
# Documentation: http://www.ssec.wisc.edu/software/polar2grid/
"""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 |
+---------------------------+-----------------------------------------------------+-------------------------+
"""
from __future__ import annotations
from argparse import ArgumentParser, _ArgumentGroup
from typing import Optional
from ._base import ReaderProxyBase
ALL_BANDS = [str(x) for x in range(1, 26)]
ALL_ANGLES = ["solar_zenith_angle", "solar_azimuth_angle", "sensor_zenith_angle", "sensor_azimuth_angle"]
ALL_COMPS = ["true_color", "false_color"]
DEFAULT_PRODUCTS = ALL_BANDS + ALL_COMPS
PRODUCT_ALIASES = {}
FILTERS = {
"day_only": {
"standard_name": [
"toa_bidirectional_reflectance",
"true_color",
"false_color",
"natural_color",
],
},
}
[docs]
class ReaderProxy(ReaderProxyBase):
"""Provide Polar2Grid-specific information about this reader's products."""
is_polar2grid_reader = True
[docs]
def get_default_products(self) -> list[str]:
"""Get products to load if users hasn't specified any others."""
return DEFAULT_PRODUCTS
[docs]
def get_all_products(self) -> list[str]:
"""Get all polar2grid products that could be loaded."""
return ALL_BANDS + ALL_COMPS + ALL_ANGLES
@property
def _aliases(self) -> dict:
return PRODUCT_ALIASES
[docs]
def add_reader_argument_groups(
parser: ArgumentParser, group: Optional[_ArgumentGroup] = None
) -> tuple[Optional[_ArgumentGroup], Optional[_ArgumentGroup]]:
"""Add reader-specific command line arguments to an existing argument parser."""
return None, None
