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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-4B GHI relative spectral responses.
Data from https://img.nsmc.org.cn/PORTAL/NSMC/DATASERVICE/SRF/FY4B/FY4B_GHI_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
FY4_GHI_BAND_NAMES = ['ch1', 'ch2', 'ch3', 'ch4', 'ch5', 'ch6', 'ch7']
BANDNAME_SCALE2MICROMETERS = {'FY-4B': {'ch1': 0.001,
'ch2': 0.001,
'ch3': 0.001,
'ch4': 0.001,
'ch5': 0.001,
'ch6': 0.001,
'ch7': 1.0,
}}
class GHIRSR(InstrumentRSR):
"""Container for the FY-4 GHI RSR data."""
def __init__(self, bandname, platform_name):
"""Initialise the FY-4 GHI relative spectral response data."""
super(GHIRSR, self).__init__(bandname, platform_name, FY4_GHI_BAND_NAMES)
self.instrument = INSTRUMENTS.get(platform_name, 'ghi')
if type(self.instrument) is list:
self.instrument = 'ghi'
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]
scale = BANDNAME_SCALE2MICROMETERS[platform_name].get(bandname)
if scale:
self._load(scale=scale)
else:
LOG.error(
"Failed determine the scale used to convert to wavelength in micrometers - channel = %s", bandname)
raise AttributeError('no scale for bandname %s', bandname)
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 GHI RSR data for the band requested.
Wavelength is given in nanometers.
"""
data = np.genfromtxt(self.requested_band_filename,
unpack=True, delimiter='\t',
names=['wavelength',
'response'],
skip_header=1)
wavelength = data[0] * scale
response = data[1]
# Response can be either 0-1 or 0-100 depending on RSR source - this scales to 0-1 range.
if np.nanmax(response > 1):
response = response / 100.
# Cut unneeded points
pts = np.argwhere(response > 0.001)
wavelength = np.squeeze(wavelength[pts])
response = np.squeeze(response[pts])
self.rsr = {'wavelength': wavelength, 'response': response}
def convert_ghi():
"""Read original GHI RSR data and convert to common Pyspectral hdf5 format."""
# For FY-4B
tohdf5(GHIRSR, 'FY-4B', FY4_GHI_BAND_NAMES)
if __name__ == "__main__":
LOG = get_logger(__name__)
logging_on()
convert_ghi()
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