4.10. CLAVR-x Cloud Product Reader

The CLAVR-x reader is for reading files created by the Community Satellite Processing Package (CSPP) Clouds from AVHRR Extended (CLAVR-x) processing system software. The CLAVR-x reader supports CSPP CLAVR-x product files created from VIIRS, MODIS and AVHRR imaging sensors in the native HDF4 format. The reader can be specified with the polar2grid.sh command using the clavrx reader name. The CLAVR-x reader provides the following products, which include support for the VIIRS Day/Night Band Lunar Reflectance:

Product Name

Description

cloud_type

Cloud Type

cld_height_acha

Cloud Top Height (m)

cld_temp_acha

Cloud Top Temperature (K)

cld_emiss_acha

Cloud Emissivity

cld_opd_dcomp

Cloud Optical Depth Daytime

cld_opd_nlcomp

Cloud Optical Depth Nighttime

cld_reff_dcomp

Cloud Effective Radius Daytime (micron)

cld_reff_nlomp

Cloud Effective Radius Nighttime (micron)

cloud_phase

Cloud Phase (5 categories)

rain_rate

Rain Rate (mm/hr)

refl_lunar_dnb_nom

Lunar Reflectance (VIIRS DNB nighttime only)

4.10.1. Command Line Arguments

usage: polar2grid.sh clavrx <writer> [-h] [--list-products]
                                     [-p PRODUCTS [PRODUCTS ...]]

4.10.1.1. Frontend Initialization

swath extraction initialization options

--list-products

List available frontend products and exit

Default: False

4.10.1.2. Frontend Swath Extraction

swath extraction options

-p, --products

Specify frontend products to process

Examples:

polar2grid.sh clavrx gtiff -h

polar2grid.sh clavrx scmi --sector-id LCC --list-products -f snpp/clavrx_npp*.hdf

polar2grid.sh clavrx gtiff -p cld_height_acha cloud_phase cloud_type -f clavrx_npp_d20170520_t2058143_e2059385_b28822.level2.hdf

polar2grid.sh clavrx hdf --grid-coverage=.01 -p cld_opd_nlcomp cld_reff_nlcomp refl_lunar_dnb_nom -f snpp/night/clavrx_npp*.hdf

polar2grid.sh clavrx binary -f clavrx_hrpt_noaa19_20170517_0936_42605.l1b.level2.hdf

polar2grid.sh clavrx scmi -g polar_alaska_1km --sector-id Polar --letters --compress -p cld_temp_acha --grid-coverage=.05 -f /modis/clavrx_a1.17140.2129.1000m.level2.hdf