JPSS1 Product Descriptions: VJ109

Last update: October 25, 2023

Data Set Short Name:
VJ109_NRT

Data Set Long Name:
VIIRS/JPSS1 Atmospherically Corrected Surface Reflectance 6-Min L2 Swath 375m, 750m NRT

Platform:
Joint Polar-orbiting Satellite System-1 (JPSS-1; now NOAA-20)

Instrument:
Visible Infrared Imaging Radiometer Suite (VIIRS)

Product Description:
The VJ109_NRT is a Near Real Time (NRT) VIIRS/JPSS1 375 m, 750 m Atmospherically Corrected Surface Reflectance product. The JPSS1/VIIRS surface reflectance products are estimates of surface reflectance in each of the VIIRS reflective bands I1-I3, M1-M5, M7, M8, M10, and M11. The VJ109 Level-2 surface reflectance product contains approximately 6 minutes' worth of data. Surface reflectance for each moderate-resolution (750m) or imagery-resolution (375m) pixel is retrieved separately for the Level-2 products.

Surface reflectance is obtained by adjusting top-of-atmosphere reflectance to compensate for atmospheric effects. Corrections are made for the effects of molecular gases, including ozone and water vapor, and for the effects of atmospheric aerosols. The inputs to the surface reflectance algorithm include top-of-atmosphere reflectance for the VIIRS visible bands (VJ102MOD, VJ102IMG), the VIIRS cloud mask and aerosol product (NPP-CMIP_L2), aerosol optical thickness (NPP_VAOTIP_L2, NPP_VAMIP_L2), and atmospheric data obtained from a reanalysis (surface pressure, atmospheric precipitable water, and ozone concentration).
All surface reflectance products are produced for daytime conditions only. The product is produced under all atmospheric conditions except for night and oceans. Pixels when not produced are replaced by fill values in the Level-2 and Level-2G products.

file_naming_convention = "VJ109_NRT.AYYYYDDD.HHMM.CCC.YYYYDDDHHMMSS.hdf

• AYYYYDDD = Acquisition Year and Day of Year
• HHMM = Hour and minute of acquisition
• CCC = Collection version number
• YYYYDDDHHMMSS = Production Date and Time
• hdf = Hierarchical Data Format (version 4)

Production Frequency:
~140 file per day

Spatial Coverage:
Global

Spatial Resolution:
375m & 750m

File Size (MB):
~230

Citation:

Dataset Originator/Creator:
NASA JPSS1 Land Science Team/MODIS Adaptive Processing System (MODAPS)

Data Authors:
Eric Vermote

Dataset DOI:
https://org/10.5067/VIIRS/VJ109_NRT.002