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Merge pull request #223 from yukaribbba/add_fy3abc_mersi1_rsr
Add RSR convert script for MERSI-1 on FY-3A/B/C
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#!/usr/bin/env python | ||
# -*- coding: utf-8 -*- | ||
# | ||
# Copyright (c) 2018-2024 Pytroll developers | ||
# | ||
# | ||
# 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/>. | ||
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"""Read the MERSI-1 relative spectral responses. | ||
Data available from NSMC: | ||
https://img.nsmc.org.cn/PORTAL/NSMC/DATASERVICE/SRF/FY3A/FY3A_MERSI_SRF.rar | ||
https://img.nsmc.org.cn/PORTAL/NSMC/DATASERVICE/SRF/FY3B/FY3B_MERSI_SRF.rar | ||
https://img.nsmc.org.cn/PORTAL/NSMC/DATASERVICE/SRF/FY3C/FY3C_MERSI_SRF.rar | ||
""" | ||
import logging | ||
import os | ||
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import numpy as np | ||
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from pyspectral.raw_reader import InstrumentRSR | ||
from pyspectral.utils import INSTRUMENTS | ||
from pyspectral.utils import convert2hdf5 as tohdf5 | ||
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LOG = logging.getLogger(__name__) | ||
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MERSI1_FY3AC_BAND_NAMES = ['ch1', 'ch2', 'ch3', 'ch4', 'ch5', 'ch6', 'ch7', 'ch8', | ||
'ch9', 'ch10', 'ch11', 'ch12', 'ch13', 'ch14', 'ch15', 'ch16', | ||
'ch17', 'ch18', 'ch19', 'ch20'] | ||
MERSI1_FY3B_BAND_NAMES = ['ch1', 'ch2', 'ch3', 'ch4', 'ch6', 'ch7', 'ch8', | ||
'ch9', 'ch10', 'ch11', 'ch12', 'ch13', 'ch14', 'ch15', 'ch16', | ||
'ch17', 'ch18', 'ch19', 'ch20'] | ||
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class Mersi1FY3ABRSR(InstrumentRSR): | ||
"""Container for the FY3A/B/C MERSI-1 RSR data.""" | ||
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def __init__(self, bandname, platform_name): | ||
"""Initialize the MERSI-1 RSR class.""" | ||
# FY-3B RSR doesn't have ch5(IR) band | ||
mersi1_band_names = MERSI1_FY3AC_BAND_NAMES if platform_name != "FY-3B" else MERSI1_FY3B_BAND_NAMES | ||
super(Mersi1FY3ABRSR, self).__init__(bandname, platform_name, mersi1_band_names) | ||
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self.instrument = INSTRUMENTS.get(platform_name, 'mersi-1') | ||
if type(self.instrument) is list: | ||
self.instrument = 'mersi-1' | ||
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self._get_options_from_config() | ||
self._get_bandfilenames() | ||
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LOG.debug("Filenames: %s", str(self.filenames)) | ||
if self.filenames[bandname] and os.path.exists(self.filenames[bandname]): | ||
self.requested_band_filename = self.filenames[bandname] | ||
self._load() | ||
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else: | ||
LOG.warning("Couldn't find an existing file for this band: %s", | ||
str(self.bandname)) | ||
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self.filename = self.requested_band_filename | ||
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def _load(self, scale=0.001): | ||
"""Load the MERSI-1 RSR data for the band requested. | ||
Wavelength is given in nanometers. | ||
""" | ||
data = np.genfromtxt(self.requested_band_filename, | ||
unpack=True, | ||
skip_header=0) | ||
wavelength = data[0] * scale | ||
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if self.platform_name != "FY-3B": | ||
response = data[1] | ||
else: | ||
# FY-3B RSRs are organized in two files | ||
fy3b_file1_bands_part1 = ["ch1", "ch2", "ch3", "ch4"] | ||
fy3b_file1_bands_part2 = ["ch8", "ch9", "ch10", "ch11", "ch12", "ch13", "ch14", "ch15", "ch16", "ch17", | ||
"ch18", "ch19", "ch20"] | ||
fy3b_file2_bands = ["ch6", "ch7"] | ||
if self.bandname in fy3b_file1_bands_part1: | ||
response = data[fy3b_file1_bands_part1.index(self.bandname) + 1] | ||
elif self.bandname in fy3b_file1_bands_part2: | ||
response = data[fy3b_file1_bands_part2.index(self.bandname) + 4] | ||
else: | ||
response = data[fy3b_file2_bands.index(self.bandname) + 1] | ||
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# Cut unneeded points | ||
pts = np.argwhere(response > 0.001) | ||
wavelength = np.squeeze(wavelength[pts]) | ||
response = np.squeeze(response[pts]) | ||
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# It is possible that some points of bands 1/2/3 where wavelength > 800 still has response > 0.001 | ||
# They're out of the wavelength range of the band. | ||
# And will trigger a warning in pyspectral when doing atmospheric corrections | ||
# So let's cut these points | ||
if self.bandname in ["1", "2", "3"]: | ||
pts2 = np.argwhere(data['wavelength'] < 800) | ||
wavelength = np.squeeze(wavelength[pts2]) | ||
response = np.squeeze(response[pts2]) | ||
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self.rsr = {'wavelength': wavelength, 'response': response} | ||
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if __name__ == "__main__": | ||
for platform_name in ["FY-3A", "FY-3B", "FY-3C"]: | ||
band_list = MERSI1_FY3AC_BAND_NAMES if platform_name != "FY-3B" else MERSI1_FY3B_BAND_NAMES | ||
tohdf5(Mersi1FY3ABRSR, platform_name, band_list) |