JPSS1 Product Descriptions: VJ109GA

Last update: October 25, 2023

Data Set Short Name:
VJ109GA_NRT

Data Set Long Name:
VIIRS/JPSS1 Surface Reflectance Daily L2G Global 1km and 500m SIN Grid NRT

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

Instrument:
Visible Infrared Imaging Radiometer Suite (VIIRS)

Product Description:
The VJ109GA_NRT is a Near Real Time (NRT) JPSS1/VIIRS 500m and 1km Daily Level 2G 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. VJ109GA is a Level-2G surface reflectance product produced on a 10km x 10km grid. The VJ109GA surface reflectance product is composed of all available surface reflectance observations for a given day over a set of tiles with global coverage. The tile numbering scheme and boundaries are the same as for MODIS. The first set of observations for each data set and grid cell are projected onto a two-dimensional grid and stored as 10km square tiles at 500m and 1 km resolution.

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 (JPSS1-CMIP_L2), aerosol optical thickness (JPSS1_VAOTIP_L2, JPSS1_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 = "VJ109GA_NRT.AYYYYDDD.HHMM.CCC.YYYYDDDHHMMSS.h5

• AYYYYDDD = Acquisition Year and Day of Year
• HHMM = Hour and minute of acquisition
• CCC = Collection version number
• YYYYDDDHHMMSS = Production Date and Time
• h5 = Hierarchical Data Format (version 5)

Production Frequency:
~460 file per day

Spatial Coverage:
Global

Spatial Resolution:
500m & 1km

File Size (MB):
~90

Citation:

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

Data Authors:
Eric Vermote

Dataset DOI:
https://doi.org/10.5067/VIIRS/VJ109GA_NRT.002