4.11. VIIRS EDR Reader

The VIIRS EDR Reader operates on Environmental Data Record (SDR) HDF5 files from the Suomi National Polar-orbiting Partnership’s (NPP), the NOAA20, or the NOAA-21 Visible/Infrared Imager Radiometer Suite (VIIRS) instrument. The VIIRS EDR reader requires filenames to match one of a couple different standard filename schemes used for official products. EDR files are typically named as below:

JRR-AOD_v3r2_npp_s202307230941369_e202307230943011_c202307231038217.nc

The VIIRS EDR reader supports most JPSS Risk Reduction (JRR) enterprise algorithm output. The VIIRS EDR reader can be specified to the polar2grid.sh script with the reader name viirs_edr.

This reader’s default remapping algorithm is ewa for Elliptical Weighted Averaging resampling. The --weight-delta-max parameter set to 40 and the --weight-distance-max parameter set to 2.

Product Name	Description
surf_refl_i01	I01 Surface Reflectance Band
surf_refl_i02	I02 Surface Reflectance Band
surf_refl_i03	I03 Surface Reflectance Band
surf_refl_m01	M01 Surface Reflectance Band
surf_refl_m02	M02 Surface Reflectance Band
surf_refl_m03	M03 Surface Reflectance Band
surf_refl_m04	M04 Surface Reflectance Band
surf_refl_m05	M05 Surface Reflectance Band
surf_refl_m07	M07 Surface Reflectance Band
surf_refl_m08	M08 Surface Reflectance Band
surf_refl_m10	M10 Surface Reflectance Band
surf_refl_m11	M11 Surface Reflectance Band
true_color_surf	Ratio sharpened surface true color
false_color_surf	Ratio sharpened surface false color
NDVI	Normalized Difference Vegetation Index
EVI	Enhanced Vegetation Index
CldTopTemp	Cloud Top Temperature
CldTopHght	Cloud Top Height
AOD550	Aerosol Optical Depth
VLST	Land Surface Temperature

4.11.1. Command Line Arguments

usage: polar2grid.sh -r viirs_edr -w <writer> [-h] [--filter-veg | --no-filter-veg] [--aod-qc-filter {None,0,1,2,3}]

4.11.1.1. VIIRS EDR Reader

--filter-veg, --no-filter-veg

Filter vegetation index variables by various quality flags. Default is enabled.

Default: True

--aod-qc-filter

Possible choices: None, 0, 1, 2, 3

Filter AOD550 variable by QCAll variable. Value specifies the maximum quality to include (0-high, 1-medium, 2-low, 3-no retrieval). Defaults to 1 which means medium and high quality data are included.

Default: 1

Examples:

polar2grid.sh -r viirs_edr -w geotiff -f <path to files>/<list of files>

polar2grid.sh -r viirs_edr -w geotiff -h

polar2grid.sh -r viirs_edr -w geotiff --list-products -f ../edr/*.nc

polar2grid.sh -r viirs_edr -w geotiff -p true_color_surf false_color_surf --num-workers 8 -f ../edr/edr/SurfRefl*.nc

polar2grid.sh -r viirs_edr -w hdf5 --add-geolocation --dtype float32 -p NDVI EVI --maximum-weight-mode -f SurfRefl*.nc

polar2grid.sh -r viirs_edr -w awips_tiled -p AOD550 CldTopHght CldTopTemp  -g lcc_conus_300 --sector-id LCC --letters --compress -f /viirs/JRR-AOD_v3r0_j01_s202406051854471_e202406051856116_c202406052204237.nc /viirs/JRR-CloudHeight_v3r0_j01_s202406051854471_e202406051856116_c202406052204237.nc