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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2015-2022 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 Himawari AHI spectral response functions.
Data from http://www.data.jma.go.jp/mscweb/en/himawari89/space_segment/spsg_ahi.html#srf
"""
import logging
import os
import numpy as np
from xlrd import open_workbook
from pyspectral.config import get_config
from pyspectral.utils import get_central_wave
LOG = logging.getLogger(__name__)
AHI_BAND_NAMES = {'Band 1': 'ch1',
'Band 2': 'ch2',
'Band 3': 'ch3',
'Band 4': 'ch4',
'Band 5': 'ch5',
'Band 6': 'ch6',
'Band 7': 'ch7',
'Band 8': 'ch8',
'Band 9': 'ch9',
'Band 10': 'ch10',
'Band 11': 'ch11',
'Band 12': 'ch12',
'Band 13': 'ch13',
'Band 14': 'ch14',
'Band 15': 'ch15',
'Band 16': 'ch16'
}
#: Default time format
_DEFAULT_TIME_FORMAT = '%Y-%m-%d %H:%M:%S'
#: Default log format
_DEFAULT_LOG_FORMAT = '[%(levelname)s: %(asctime)s : %(name)s] %(message)s'
class AhiRSR(object):
"""Container for the Himawari AHI relative spectral response data."""
def __init__(self, platform_name, wavespace='wavelength'):
"""Initialize the AHI RSR class."""
self.platform_name = platform_name
self.filename = None
self.rsr = None
options = get_config()
self.output_dir = options.get('rsr_dir', './')
ahi_options = options[platform_name + '-ahi']
self.filename = ahi_options['path']
LOG.debug("Filenames: " + str(self.filename))
if os.path.exists(self.filename):
self._load()
else:
raise IOError("Couldn't find an existing file for this band: " +
str(self.bandname))
def _load(self, filename=None):
"""Load the Himawari AHI RSR data for the band requested."""
if not filename:
filename = self.filename
wb_ = open_workbook(filename)
self.rsr = {}
sheet_names = []
for sheet in wb_.sheets():
if sheet.name in ['Title', ]:
continue
ch_name = AHI_BAND_NAMES.get(
sheet.name.strip(), sheet.name.strip())
sheet_names.append(sheet.name.strip())
self.rsr[ch_name] = {'wavelength': None,
'response': None}
wvl = np.array(
sheet.col_values(0, start_rowx=5, end_rowx=5453))
resp = np.array(
sheet.col_values(2, start_rowx=5, end_rowx=5453))
self.rsr[ch_name]['wavelength'] = wvl
self.rsr[ch_name]['response'] = resp
def convert2hdf5(platform_name):
"""Retrieve original RSR data and convert to internal hdf5 format."""
import h5py
ahi = AhiRSR(platform_name)
filename = os.path.join(ahi.output_dir,
"rsr_ahi_{platform}.h5".format(platform=platform_name))
with h5py.File(filename, "w") as h5f:
h5f.attrs['description'] = 'Relative Spectral Responses for AHI'
h5f.attrs['platform_name'] = platform_name
h5f.attrs['sensor'] = 'ahi'
h5f.attrs['band_names'] = AHI_BAND_NAMES.values()
for chname in AHI_BAND_NAMES.values():
grp = h5f.create_group(chname)
wvl = ahi.rsr[chname][
'wavelength'][~np.isnan(ahi.rsr[chname]['wavelength'])]
rsp = ahi.rsr[chname][
'response'][~np.isnan(ahi.rsr[chname]['wavelength'])]
grp.attrs['central_wavelength'] = get_central_wave(wvl, rsp)
arr = ahi.rsr[chname]['wavelength']
dset = grp.create_dataset('wavelength', arr.shape, dtype='f')
dset.attrs['unit'] = 'm'
dset.attrs['scale'] = 1e-06
dset[...] = arr
arr = ahi.rsr[chname]['response']
dset = grp.create_dataset('response', arr.shape, dtype='f')
dset[...] = arr
if __name__ == "__main__":
import sys
LOG = logging.getLogger('ahi_rsr')
handler = logging.StreamHandler(sys.stderr)
formatter = logging.Formatter(fmt=_DEFAULT_LOG_FORMAT,
datefmt=_DEFAULT_TIME_FORMAT)
handler.setFormatter(formatter)
handler.setLevel(logging.DEBUG)
LOG.setLevel(logging.DEBUG)
LOG.addHandler(handler)
for satnum in [8, 9]:
convert2hdf5('Himawari-{0:d}'.format(satnum))
print("Himawari-{0:d} done...".format(satnum))
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