libera_utils.footprint_matching.readers.viirs#

VIIRS cloud property reader plugin for the footprint matching pipeline.

Data source: NOAA-20 (JPSS-1) VIIRS Daily Level-3 Cloud Properties - Product: CLDPROP_D3_VIIRS_NOAA20 (Collection 011)

  • Format: NetCDF4 with nested groups

  • Spatial resolution: 1° × 1° (~111 km at equator)

  • Grid: 360 × 180 regular lat/lon (global)

  • Data layout: variables stored with dimension order (longitude, latitude), requiring a transpose to the expected (latitude, longitude) output order

  • Temporal resolution: Daily composites

  • Variables: Cloud_Optical_Thickness (Mean), Cloud_Top_Pressure (Mean)

NetCDF4 group layout (CLDPROP_D3)#

Root:
  latitude  (180,)   — 1° bin centers, −89.5 to 89.5
  longitude (360,)   — 1° bin centers, −179.5 to 179.5
  Cloud_Optical_Thickness_Combined/
    Mean      (360, 180) — daily mean cloud optical thickness
  Cloud_Top_Pressure/
    Mean      (360, 180) — daily mean cloud top pressure [hPa]

Fill value: each field’s own _FillValue (−9999.0 in the distributed files), applied by netCDF4’s automatic masking and replaced with NaN before output.

References

Product page:

https://www.ncei.noaa.gov/products/climate-data-records/cloud-properties-viirs

ATBD:

https://www.ncei.noaa.gov/pub/data/sds/cdr/CDRs/Cloud_Properties_VIIRS/ AlgorithmDescriptionVIIRS_01B-20a.pdf

Data access:

https://www.ncei.noaa.gov/data/cloud-properties-viirs/access/

File naming:

CLDPROP_D3_VIIRS_NOAA20.A{YYYYDDD}.{collection}.{YYYYDDDHHMMSS}.nc

Classes

VIIRSCldpropD3Reader(file_paths)

Read VIIRS daily cloud properties from a CLDPROP_D3 NetCDF4 file.