4.4. AGRI FY-4B L1 Reader¶
The AGRI FY-4B L1 Reader operates on Level 1 (L1) HDF5 files for the Advanced Geostationary Radiation Imager (AGRI) instrument on board the Feng-Yun - 4B (FY-4B) satellite. Geo2Grid determines if it supports files based on the input filename. Files for AGRI supported by Geo2Grid usually have the following naming scheme:
FY4B-_AGRI--_N_DISK_1047E_L1-_FDI-_MULT_NOM_20220117000000_20220117001459_0500M_V0001.HDF
The AGRI L1 reader supports all instrument spectral bands, identified in
Geo2Grid as the products shown in the table below. The
AGRI L1 reader for FY-4B can be provided to the main geo2grid.sh script
using the -r option and the reader name agri_fy4b_l1.
The list of supported products includes true and natural color imagery. These are created by means of a python based atmospheric Rayleigh scattering correction algorithm that is executed as part of the Geo2Grid AGRI L1 reader, along with sharpening to the highest spatial resolution. For more information on the creation of RGBs, please see the RGB section.
Product Name |
Description |
|---|---|
C01 |
Channel 1 (0.47um) Reflectance Band |
C02 |
Channel 2 (0.65um) Reflectance Band |
C03 |
Channel 3 (0.83um) Reflectance Band |
C04 |
Channel 4 (1.37um) Reflectance Band |
C05 |
Channel 5 (1.61um) Reflectance Band |
C06 |
Channel 6 (2.25um) Reflectance Band |
C07 |
Channel 7 (3.75um) Brightness Temperature Band |
C08 |
Channel 8 (3.75um) Brightness Temperature Band |
C09 |
Channel 9 (6.25um) Brightness Temperature Band |
C10 |
Channel 10 (6.95um) Brightness Temperature Band |
C11 |
Channel 11 (7.42um) Brightness Temperature Band |
C12 |
Channel 12 (8.5um) Brightness Temperature Band |
C13 |
Channel 13 (10.8um) Brightness Temperature Band |
C14 |
Channel 14 (12.0um) Brightness Temperature Band |
C15 |
Channel 15 (13.5um) Brightness Temperature Band |
true_color |
Ratio sharpened rayleigh corrected true color |
natural_color |
Ratio sharpened corrected natural color |
ash |
Ash RGB |
dust |
Dust RGB |
fog |
Fog RGB |
4.4.1. Command Line Usage¶
usage: geo2grid.sh -r agri_fy4b_l1 -w <writer> [-h]
Examples:
geo2grid.sh -r agri_fy4b_l1 -h
geo2grid.sh -r agri_fy4b_l1 -w geotiff --list-products -f /data/fy4b/agri
geo2grid.sh -r agri_fy4b_l1 -w geotiff --num-workers 8 -f /data/fy4b/agri
geo2grid.sh -r agri_fy4b_l1 -w geotiff -p C02 C03 C08 C10 C12 -f FY4B-_AGRI--*.HDF
geo2grid.sh -r agri_fy4b_l1 -w geotiff --ll-bbox 100 20 120 40 -p true_color -f /data/*.HDF
