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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/>.
"""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
import numpy as np
from pyspectral.raw_reader import InstrumentRSR
from pyspectral.utils import INSTRUMENTS
from pyspectral.utils import convert2hdf5 as tohdf5
LOG = logging.getLogger(__name__)
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']
class Mersi1FY3ABRSR(InstrumentRSR):
"""Container for the FY3A/B/C MERSI-1 RSR data."""
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)
self.instrument = INSTRUMENTS.get(platform_name, 'mersi-1')
if type(self.instrument) is list:
self.instrument = 'mersi-1'
self._get_options_from_config()
self._get_bandfilenames()
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()
else:
LOG.warning("Couldn't find an existing file for this band: %s",
str(self.bandname))
self.filename = self.requested_band_filename
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
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]
# Cut unneeded points
pts = np.argwhere(response > 0.001)
wavelength = np.squeeze(wavelength[pts])
response = np.squeeze(response[pts])
# 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])
self.rsr = {'wavelength': wavelength, 'response': response}
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)
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