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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2018-2023 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 FY-3G MERSI-RM relative spectral responses.
Data from https://img.nsmc.org.cn/PORTAL/NSMC/DATASERVICE/SRF/FY3G/FY-3G_MERSI-RM_SRF.zip
"""
import os
import numpy as np
from pyspectral.raw_reader import InstrumentRSR
from pyspectral.utils import INSTRUMENTS
from pyspectral.utils import convert2hdf5 as tohdf5
from pyspectral.utils import get_logger, logging_on
FY3_MERSIRM_BAND_NAMES = ['ch1', 'ch2', 'ch3', 'ch4', 'ch5', 'ch6', 'ch7', 'ch8']
class MersiRMRSR(InstrumentRSR):
"""Container for the FY-3 MERSI-RM RSR data."""
def __init__(self, bandname, platform_name):
"""Initialise the FY-3 MERSI-RM relative spectral response data."""
super(MersiRMRSR, self).__init__(bandname, platform_name, FY3_MERSIRM_BAND_NAMES)
self.instrument = INSTRUMENTS.get(platform_name, 'mersi-rm')
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-RM RSR data for the band requested.
Wavelength is given in nanometers.
"""
data = np.genfromtxt(self.requested_band_filename,
unpack=True,
names=['wavelength',
'response'],
skip_header=1)
wavelength = data[0] * scale
response = data[1]
self.rsr = {'wavelength': wavelength, 'response': response}
def convert_mersirm():
"""Read original MERSI-RM RSR data and convert to common Pyspectral hdf5 format."""
# For FY-3G
tohdf5(MersiRMRSR, 'FY-3G', FY3_MERSIRM_BAND_NAMES)
if __name__ == "__main__":
LOG = get_logger(__name__)
logging_on()
convert_mersirm()
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