Source code for polar2grid.readers.mersi_ll_l1b
# Copyright (C) 2023 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-3E MERSI-LL 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}.FY3E-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 ``mersi_ll_l1b`` frontend name. The MERSI-LL frontend provides the following products:
+---------------------------+-----------------------------------------------------+-------------------------+
| **Product Name** | **Description** | Central Wavelength (um) |
+===========================+=====================================================+=========================+
| 1 | Channel 1 Day/Night Radiance Band | 0.709 |
+---------------------------+-----------------------------------------------------+-------------------------+
| 2 | Channel 2 Brightness Temperature Band | 3.80 |
+---------------------------+-----------------------------------------------------+-------------------------+
| 3 | Channel 3 Brightness Temperature Band | 4.05 |
+---------------------------+-----------------------------------------------------+-------------------------+
| 4 | Channel 4 Brightness Temperature Band | 7.20 |
+---------------------------+-----------------------------------------------------+-------------------------+
| 5 | Channel 5 Brightness Temperature Band | 8.55 |
+---------------------------+-----------------------------------------------------+-------------------------+
| 6 | Channel 6 Brightness Temperature Band | 10.8 |
+---------------------------+-----------------------------------------------------+-------------------------+
| 7 | Channel 7 Brightness Temperature Band | 12.0 |
+---------------------------+-----------------------------------------------------+-------------------------+
| histogram_dnb | Histogram Equalized DNB Band | N/A |
+---------------------------+-----------------------------------------------------+-------------------------+
| adaptive_dnb | Adaptive Histogram Equalized DNB Band | 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, 8)]
ALL_ANGLES = [
"solar_zenith_angle",
"solar_azimuth_angle",
"sensor_zenith_angle",
"sensor_azimuth_angle",
"moon_zenith_angle",
"moon_azimuth_angle",
]
ALL_COMPS = ["histogram_dnb", "adaptive_dnb"]
# band 1 (DNB) is not useful by itself, histogram_dnb is not a default
DEFAULT_PRODUCTS = ALL_BANDS[1:] + ALL_COMPS[1:]
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