VJ203IMG - VIIRS/JPSS2 Imagery Resolution Terrain-Corrected Geolocation 6-Min L1 Swath 375m



VJ203IMG represents the short-name for the Joint Polar Satellite System-2 (JPSS-2/NOAA-21; referred to hereafter as J2) platform-derived NASA VIIRS L1 terrain-corrected geolocation product and contains the derived line-of-sight (LOS) vectors for each of the 375-m image-resolution or I-bands. The geolocation algorithm uses a number of inputs that include an Earth ellipsoid, geoid, and a digital terrain model along with the J2 platform’s ephemeris and attitude data, and knowledge of the VIIRS sensor and satellite geometry. It produces geodetic coordinates (latitude and longitude), and related parameters for each VIIRS L1 pixel. The VJ203IMG product includes geodetic latitude, longitude, surface height above the geoid, solar zenith and azimuth angles, sensor zenith and azimuth angles, land/water mask, and quality flag for every pixel location. VJ203IMG provides a fundamental input to derive a number of VIIRS I-band higher-level products. The data product described in this landing page is a v2.1 collection and its data record starts from February 10, 2023.

Geolocation Accuracy The overall geolocation accuracy for the J2 VIIRS Level-1 data is nominally good. The nadir-equivalent geolocation accuracy is within 70 m uncertainty (1-sigma Root-Mean-Squared-Error), which is well within the specified requirement of 125 m (1-sigma RMSE).

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Shortname: VJ203IMG
Platform: JPSS-2
Instrument: VIIRS
Processing Level: Level-1A
Data Format: netCDF4/HDF5
Spatial Resolution: 375 m
Temporal Resolution: 6 minute
ArchiveSets: 5201, 5200
Collection: NPP and JPSS1 VIIRS data 2.1 (ArchiveSet 5201)
PGE Number: PGE501
File Naming Convention:

Syntax: ESDT.AYYYYDDD.HHMM.CCC.YYYYDDDHHMMSS.Format
Example: VJ203IMG.A2023044.0000.002.2023268141520.nc

  • ESDT Earth Science Data Type or Shortname
  • AYYYYDDD Acquisition Year and Day of Year
  • 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
Citation: Zhang, P., Lin, G., Dellomo, J., Tan, B., & Wolfe, R. E. (2023, October).
JPSS-2/NOAA-21 VIIRS early on-orbit geometric performance.
In Earth Observing Systems XXVIII (Vol. 12685, pp. 270–280). SPIE.
https://doi.org/10.1117/12.2677378
Keywords: JPSS-2, NOAA-21, VIIRS, L1, I-bands, Terrain-corrected Geolocation
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