This file generated: 05/10/2022

README SRF:

#+TITLE: FY4-2 AGRI
#+TITLE: Spectral Response Functions
#+DATE: <2022-08-30 Tue>
#+AUTHOR: CEMS Lannion/SONDAGE
#+EMAIL: Thomas.Lebrat@meteo.fr

* Information about Feng-Yun-4B

- Chinese meteorological satellite in GEO orbit
- Following the previous FY-4A programm (2016-2023), hence serial #2
- Space Agencies : CMA, NRSCC

| acronym | orbit (km) | longitude | lifetime    | instrument |
|---------+------------+-----------+-------------+------------|
| FY-4B   |      35786 | 133 E     | [2021-2028] | AGRI       |

* Information about AGRI

- Advanced Geostationnary Radiation Imager
- Replacing S-VISSR (FY-2A/B)
- Original file is Avaialbe at the NSMC website : nsmc.org.cn

| archive name      | size   | date         | content  | format     |
|-------------------+--------+--------------+----------+------------|
| FY4B_AGRI_SRF.zip | 308 ko | <2022-07-01> | 14 files | ASCII/UTF8 |

- note : one file is named after both channels 07 and 08

* Data processing for the ".flt files"

- using Python home made library
- signal converted from micro-metres to wavenumber
- SRF truncated to roughly +-3 half-width at half maximum

* Description of the 15 channels

*** RTTOV-VIS (micrometer units)

|    1 |    2 |    3 |    4 |    5 |    6 | ... |
|------+------+------+------+------+------+-----|
| 0.47 | 0.63 | 0.82 | 1.38 | 1.61 | 2.22 | ... |

*** RTTOV-IR

|    7 |    8 |    9 |   10 |   11 |   12 |    13 |    14 |    15 |
|------+------+------+------+------+------+-------+-------+-------|
| 3.71 | 3.71 | 6.20 | 6.93 | 7.44 | 8.56 | 10.78 | 11.94 | 13.22 |
append_coef: Following is taken from rtcoef_fy4_2_agri-ir.H5:
     |      |      |      |      |      |      |       |       |       |

Download all SRFs: rtcoef_fy4_2_agri_srf.tar.gz

Channel 01
Central wavenumber/wavelength: 21296.039 cm-1 / 0.470 microns
Comment: 1, channel 1 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH1_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch01.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch01.png

Channel 02
Central wavenumber/wavelength: 15929.100 cm-1 / 0.628 microns
Comment: 2, channel 2 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH2_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch02.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch02.png

Channel 03
Central wavenumber/wavelength: 12255.374 cm-1 / 0.816 microns
Comment: 3, channel 3 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH3_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch03.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch03.png

Channel 04
Central wavenumber/wavelength: 7259.771 cm-1 / 1.377 microns
Comment: 4, channel 4 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH4_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch04.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch04.png

Channel 05
Central wavenumber/wavelength: 6209.012 cm-1 / 1.611 microns
Comment: 5, channel 5 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH5_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch05.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch05.png

Channel 06
Central wavenumber/wavelength: 4505.579 cm-1 / 2.219 microns
Comment: 6, channel 6 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH6_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch06.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch06.png

Channel 07
Central wavenumber/wavelength: 2695.312 cm-1 / 3.710 microns
Comment: 7, channel 7 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH07-CH08_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch07.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch07.png

Channel 08
Central wavenumber/wavelength: 2695.312 cm-1 / 3.710 microns
Comment: 8, channel 8 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH07-CH08_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch08.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch08.png

Channel 09
Central wavenumber/wavelength: 1613.819 cm-1 / 6.196 microns
Comment: 9, channel 9 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH9_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch09.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch09.png

Channel 10
Central wavenumber/wavelength: 1443.510 cm-1 / 6.928 microns
Comment: 10, channel 10 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH10_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch10.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch10.png

Channel 11
Central wavenumber/wavelength: 1344.444 cm-1 / 7.438 microns
Comment: 11, channel 11 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH11_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch11.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch11.png

Channel 12
Central wavenumber/wavelength: 1167.505 cm-1 / 8.565 microns
Comment: 12, channel 12 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH12_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch12.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch12.png

Channel 13
Central wavenumber/wavelength: 927.845 cm-1 / 10.778 microns
Comment: 13, channel 13 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH13_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch13.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch13.png

Channel 14
Central wavenumber/wavelength: 836.800 cm-1 / 11.950 microns
Comment: 14, channel 14 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH14_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch14.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch14.png

Channel 15
Central wavenumber/wavelength: 750.771 cm-1 / 13.320 microns
Comment: 15, channel 15 SRF extracted from SRF_FY4B_AGRI.zip (FY4B_AGRI_SRF_CH15_Pub.txt)
SRF data: rtcoef_fy4_2_agri_srf_ch15.txt
SRF plot: rtcoef_fy4_2_agri_srf_ch15.png