27  VIIRS cloud mask

This table contains information on the Cloud presence/absence data derived from VIIRS satellite (Suomi-NPP). The data was obtained from CLDMSK_L2_VIIRS_SNPP. The table is aggregated into a 0.1-degree grid (represented by lat_bin, lon_bin).

Each record of this table represents a grid cell of a granule (i.e. this table will be unique using fields GranuleId, lat_binand lon_bin).

28 Repository

Non but the codes exist in the VM instance viirs-cloud-mask.

29 Key tables

Current version

  • scratch_masaki.cloud_mask_10th_degree_grid

Older version

non

30 Data descriptions

  • GranuleID : ID of this granule. See VIIRS footprint for the explanation of granule.
  • lat_bin : 0.1-degree grid latitude. round(lat*10)
  • lon_bin : 0.1-degree grid longitude. round(lon*10)
  • OrbitNumber : ID of this orbit.
  • StartDateTime : Start datetime of this granule.
  • mean_integer_cloud_mask : Cloud condition of this pixel (0 = cloudy, 1= probably cloudy, 2 = probably clear, 3 = confident clear). The original VIIRS CLOUD MASK have integer value, but the value is averaged for each 0.1-degree grid in this table. Thus, this field contains real number from 0 to 3.
  • mean_sensor_zenith : Mean zenith angle of VIIRS satelite in this pixel.
  • lat : 0.1-degree grid latitude. 0.1*round(lat*10)
  • lon : 0.1-degree grid longitude. 0.1*round(lat*10)

31 Caveats & Known Issues

  • This table does not include cloud information over land.
  • mean_integer_cloud_mask represents only presense/absence of the cloud, thus the cloud thickness is not taken into account.

32 Example queries