VJ102IMG - VIIRS/JPSS1 Imagery Resolution 6-Min L1B Swath 375m



VJ102IMG is the short-name for the NOAA-20 — formerly called Joint Polar-orbiting Satellite System-1 (JPSS-1) — platform-derived NASA VIIRS Level-1B calibrated radiances product that comprise five image-resolution or I-bands, which have a 375-meter resolution at nadir. These I-bands comprise three reflective solar bands (RSB) and two thermal emissive bands (TEB). Each of the I-bands has 32 detectors in the along-track direction with 32 rows of pixels per scan that offer a resolution that is twice finer than that of the moderate (M) and Day-Night bands (DNB). Ranging in wavelengths from 0.6 µm to 12.4 µm, the I-bands are sensitive to visible/reflective, near-, shortwave-, mediumwave-, and longwave-infrared wavelengths. Derived from the NASA VIIRS Level-1A raw radiances, this product includes calibrated and geolocated radiance and reflectance data, quality flags, and granule- and collection-level metadata. In contrast to a MODIS Level-1B product, which temporally spans 5 minutes, the VIIRS Level-1B calibrated radiances product contains a nominal temporal duration of 6-minutes. The image dimensions of the 375 m swath product measure 6,464 lines by 6,400 pixels.

The variables in the observation data in the NOAA-20-derived VIIRS Level-1B calibration product are almost like those from the SNPP-VIIRS Level-1B (collection-1) except for one major change: The NOAA-20 VIIRS Level-1B calibration product’s quality flags include a detector quality flag with associated masks, their values, and meanings for all the bands (I, M, and DNB)

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Shortname: VJ102IMG
Platform: JPSS-1
Instrument: VIIRS
Processing Level: Level-1B
Data Format: netCDF4/HDF5
Spatial Resolution: 375 m
Temporal Resolution: 6 minute
ArchiveSets: 5201
Collection: NPP and JPSS1 VIIRS data 2.1 (ArchiveSet 5201)
PGE Number: PGE502
File Naming Convention:

Syntax: ESDT.AYYYYDDD.HHMM.CCC.YYYYDDDHHMMSS.Format
Example: VJ102IMG.A2018008.0130.021.2021085001335.nc

  • ESDT Earth Science Data Type or Shortname
  • A Stands for Acquisition
  • YYYYDDD Data acquisition year and Day-of-year per the Julian Calendar
  • HHMM Acquisition Hour and Minute
  • CCC Version ID of the data collection
  • YYYYDDDHHMMSS Processing year, Day-of-year, UTC time (hour, minutes, seconds)
  • Format File format suffix, which in the above case represents netCDF4/HDF5
Keywords: JPSS-1 VIIRS, L1B, Image resolution, I-bands, Calibrated Radiances
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