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Merge pull request #192 from yukaribbba/add_fy4b_ghi_rsr
Add a RSR convert script for FY-4B GHI sensor
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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/>. | ||
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"""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 | ||
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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 | ||
from pyspectral.utils import get_logger, logging_on | ||
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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, | ||
}} | ||
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class GHIRSR(InstrumentRSR): | ||
"""Container for the FY-4 GHI RSR data.""" | ||
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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) | ||
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self.instrument = INSTRUMENTS.get(platform_name, 'ghi') | ||
if type(self.instrument) is list: | ||
self.instrument = 'ghi' | ||
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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] | ||
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) | ||
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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 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) | ||
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wavelength = data[0] * scale | ||
response = data[1] | ||
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# 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. | ||
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# Cut unneeded points | ||
pts = np.argwhere(response > 0.001) | ||
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wavelength = np.squeeze(wavelength[pts]) | ||
response = np.squeeze(response[pts]) | ||
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self.rsr = {'wavelength': wavelength, 'response': response} | ||
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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) | ||
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if __name__ == "__main__": | ||
LOG = get_logger(__name__) | ||
logging_on() | ||
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convert_ghi() |