Add RSR convert script for MERSI-1 on FY-3A/B/C

pyspectral/etc/pyspectral.yaml

@@ -262,6 +262,74 @@ download_from_internet: True
 #     ch9: rtcoef_electro-l_2_msugs_srf_ch09.txt
 #     ch10: rtcoef_electro-l_2_msugs_srf_ch10.txt
 
+# FY-3A-mersi-1:
+   # path: D:/MERSI1
+   # ch1: FY3A_mersi_srf_func_b01.txt
+   # ch2: FY3A_mersi_srf_func_b02.txt
+   # ch3: FY3A_mersi_srf_func_b03.txt
+   # ch4: FY3A_mersi_srf_func_b04.txt
+   # ch5: FY3A_mersi_srf_func_b05.txt
+   # ch6: FY3A_mersi_srf_func_b06.txt
+   # ch7: FY3A_mersi_srf_func_b07.txt
+   # ch8: FY3A_mersi_srf_func_b08.txt
+   # ch9: FY3A_mersi_srf_func_b09.txt
+   # ch10: FY3A_mersi_srf_func_b10.txt
+   # ch11: FY3A_mersi_srf_func_b11.txt
+   # ch12: FY3A_mersi_srf_func_b12.txt
+   # ch13: FY3A_mersi_srf_func_b13.txt
+   # ch14: FY3A_mersi_srf_func_b14.txt
+   # ch15: FY3A_mersi_srf_func_b15.txt
+   # ch16: FY3A_mersi_srf_func_b16.txt
+   # ch17: FY3A_mersi_srf_func_b17.txt
+   # ch18: FY3A_mersi_srf_func_b18.txt
+   # ch19: FY3A_mersi_srf_func_b19.txt
+   # ch20: FY3A_mersi_srf_func_b20.txt
+
+# FY-3B-mersi-1:
+   # path: D:/MERSI1
+   # ch1: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch2: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch3: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch4: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch6: FY3B_mersi_srf_B6-7.txt
+   # ch7: FY3B_mersi_srf_B6-7.txt
+   # ch8: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch9: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch10: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch11: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch12: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch13: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch14: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch15: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch16: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch17: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch18: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch19: FY3B_mersi_srf_B1-4_B8-20.txt
+   # ch20: FY3B_mersi_srf_B1-4_B8-20.txt
+
+# FY-3C-mersi-1:
+   # path: D:/MERSI1
+   # ch1:  FY3C_mersi_srf_b01.txt
+   # ch2: FY3C_mersi_srf_b02.txt
+   # ch3: FY3C_mersi_srf_b03.txt
+   # ch4: FY3C_mersi_srf_b04.txt
+   # ch5: FY3C_mersi_srf_b05.txt
+   # ch6: FY3C_mersi_srf_b06.txt
+   # ch7: FY3C_mersi_srf_b07.txt
+   # ch8: FY3C_mersi_srf_b08.txt
+   # ch9: FY3C_mersi_srf_b09.txt
+   # ch10: FY3C_mersi_srf_b10.txt
+   # ch11: FY3C_mersi_srf_b11.txt
+   # ch12: FY3C_mersi_srf_b12.txt
+   # ch13: FY3C_mersi_srf_b13.txt
+   # ch14: FY3C_mersi_srf_b14.txt
+   # ch15: FY3C_mersi_srf_b15.txt
+   # ch16: FY3C_mersi_srf_b16.txt
+   # ch17: FY3C_mersi_srf_b17.txt
+   # ch18: FY3C_mersi_srf_b18.txt
+   # ch19: FY3C_mersi_srf_b19.txt
+   # ch20: FY3C_mersi_srf_b20.txt
+
 #FY-3B-virr:
 #  path: /Users/davidh/repos/git/pyspectral/virr_srf/FY3B-VIRR
 #  ch1: ch1.prn

pyspectral/utils.py

@@ -92,8 +92,9 @@
                'NOAA-20': 'viirs',
                'NOAA-21': 'viirs',
                'Suomi-NPP': 'viirs',
-               'FY-3B': 'virr',
-               'FY-3C': 'virr',
+               'FY-3A': ['virr', "mersi-1"],
+               'FY-3B': ['virr', "mersi-1"],
+               'FY-3C': ['virr', "mersi-1"],
                'DSCOVR': 'epic'}
 
 

rsr_convert_scripts/mersi1_rsr.py

@@ -0,0 +1,119 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright (c) 2018-2024 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-1 relative spectral responses.
+
+Data available from NSMC:
+https://img.nsmc.org.cn/PORTAL/NSMC/DATASERVICE/SRF/FY3A/FY3A_MERSI_SRF.rar
+https://img.nsmc.org.cn/PORTAL/NSMC/DATASERVICE/SRF/FY3B/FY3B_MERSI_SRF.rar
+https://img.nsmc.org.cn/PORTAL/NSMC/DATASERVICE/SRF/FY3C/FY3C_MERSI_SRF.rar
+
+"""
+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__)
+
+MERSI1_FY3AC_BAND_NAMES = ['ch1', 'ch2', 'ch3', 'ch4', 'ch5', 'ch6', 'ch7', 'ch8',
+                           'ch9', 'ch10', 'ch11', 'ch12', 'ch13', 'ch14', 'ch15', 'ch16',
+                           'ch17', 'ch18', 'ch19', 'ch20']
+MERSI1_FY3B_BAND_NAMES = ['ch1', 'ch2', 'ch3', 'ch4', 'ch6', 'ch7', 'ch8',
+                          'ch9', 'ch10', 'ch11', 'ch12', 'ch13', 'ch14', 'ch15', 'ch16',
+                          'ch17', 'ch18', 'ch19', 'ch20']
+
+
+class Mersi1FY3ABRSR(InstrumentRSR):
+    """Container for the FY3A/B/C MERSI-1 RSR data."""
+
+    def __init__(self, bandname, platform_name):
+        """Initialize the MERSI-1 RSR class."""
+        # FY-3B RSR doesn't have ch5(IR) band
+        mersi1_band_names = MERSI1_FY3AC_BAND_NAMES if platform_name != "FY-3B" else MERSI1_FY3B_BAND_NAMES
+        super(Mersi1FY3ABRSR, self).__init__(bandname, platform_name, mersi1_band_names)
+
+        self.instrument = INSTRUMENTS.get(platform_name, 'mersi-1')
+        if type(self.instrument) is list:
+            self.instrument = 'mersi-1'
+
+        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-1 RSR data for the band requested.
+
+        Wavelength is given in nanometers.
+        """
+        data = np.genfromtxt(self.requested_band_filename,
+                             unpack=True,
+                             skip_header=0)
+        wavelength = data[0] * scale
+
+        if self.platform_name != "FY-3B":
+            response = data[1]
+        else:
+            # FY-3B RSRs are organized in two files
+            fy3b_file1_bands_part1 = ["ch1", "ch2", "ch3", "ch4"]
+            fy3b_file1_bands_part2 = ["ch8", "ch9", "ch10", "ch11", "ch12", "ch13", "ch14", "ch15", "ch16", "ch17",
+                                      "ch18", "ch19", "ch20"]
+            fy3b_file2_bands = ["ch6", "ch7"]
+            if self.bandname in fy3b_file1_bands_part1:
+                response = data[fy3b_file1_bands_part1.index(self.bandname) + 1]
+            elif self.bandname in fy3b_file1_bands_part2:
+                response = data[fy3b_file1_bands_part2.index(self.bandname) + 4]
+            else:
+                response = data[fy3b_file2_bands.index(self.bandname) + 1]
+
+        # Cut unneeded points
+        pts = np.argwhere(response > 0.001)
+        wavelength = np.squeeze(wavelength[pts])
+        response = np.squeeze(response[pts])
+
+        # It is possible that some points of bands 1/2/3 where wavelength > 800 still has response > 0.001
+        # They're out of the wavelength range of the band.
+        # And will trigger a warning in pyspectral when doing atmospheric corrections
+        # So let's cut these points
+        if self.bandname in ["1", "2", "3"]:
+            pts2 = np.argwhere(data['wavelength'] < 800)
+            wavelength = np.squeeze(wavelength[pts2])
+            response = np.squeeze(response[pts2])
+
+        self.rsr = {'wavelength': wavelength, 'response': response}
+
+
+if __name__ == "__main__":
+    for platform_name in ["FY-3A", "FY-3B", "FY-3C"]:
+        band_list = MERSI1_FY3AC_BAND_NAMES if platform_name != "FY-3B" else MERSI1_FY3B_BAND_NAMES
+        tohdf5(Mersi1FY3ABRSR, platform_name, band_list)