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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2018-2022 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-II relative spectral responses.
Data available from NSMC:
http://gsics.nsmc.org.cn/portal/en/fycv/srf.html
http://gsics.nsmc.org.cn/download/documents/SRF/FY3D_MERSI_SRF_Pub.zip
"""
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__)
MERSI2_BAND_NAMES = ['ch1', 'ch2', 'ch3', 'ch4', 'ch5', 'ch6', 'ch7', 'ch8',
'ch9', 'ch10', 'ch11', 'ch12', 'ch13', 'ch14', 'ch15', 'ch16',
'ch17', 'ch18', 'ch19', 'ch20', 'ch21', 'ch22', 'ch23', 'ch24',
'ch25']
class Mersi2RSR(InstrumentRSR):
"""Container for the FY3D MERSI-II RSR data."""
def __init__(self, bandname, platform_name):
"""Initialize the MERSI-2 RSR class."""
super(Mersi2RSR, self).__init__(bandname, platform_name, MERSI2_BAND_NAMES)
self.instrument = INSTRUMENTS.get(platform_name, 'mersi-2')
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))
# To be compatible with VIIRS....
self.filename = self.requested_band_filename
def _load(self, scale=0.001):
"""Load the MERSI-2 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=0)
wavelength = data['wavelength'] * scale
response = data['response']
self.rsr = {'wavelength': wavelength, 'response': response}
if __name__ == "__main__":
for platform_name in ["FY-3D", ]:
tohdf5(Mersi2RSR, platform_name, MERSI2_BAND_NAMES)
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