S-NPP Product Descriptions: VNP46A1G_NRT

Last update: October 18, 2023

Data Set Short Name:
VNP46A1G_NRT

Data Set Long Name:
VIIRS/NPP Granular Gridded Day Night Band 500m Linear Lat Lon Grid Night NRT

Platform:
Suomi National Polar-orbiting Partnership (S-NPP)

Instrument:
Visible Infrared Imaging Radiometer Suite (VIIRS)

Product Description:
The Near Real Time (NRT) Suomi National Polar-Orbiting Partnership (S-NPP) NASA Visible Infrared Imaging Radiometer Suite (VIIRS) hourly top-of-atmosphere, at-sensor nighttime radiance product called VIIRS/NPP Granular Gridded Day Night Band 500m Linear Lat Lon Grid Night. Known by its short-name, VNP46A1G_NRT, is same as VNP46A1_NRT except that this product is generated hourly, cumulative from start of day through the hour the file is generated for.

This product contains 26 Science Data Sets (SDS) that include sensor radiance, zenith and azimuth angles (at-sensor, solar, and lunar), cloud-mask flags, time, shortwave IR radiance, brightness temperatures, VIIRS quality flags, moon phase angle, and moon illumination fraction. It also provides Quality Flag (QF) information specific to the cloud-mask, VIIRS moderate-resolution bands M10, M11, M12, M13, M15, M16, and DNB.

File_naming_convention = VNP46A1G_NRT.AYYYYDDD.HHMM.hXXvYY.CCC.YYYYDDDHHMMSS.h5

• AYYYYDDD = Acquisition Year and Day of Year
• HHMM = Hour and minute of acquisition
• hXXvYY = Sinusoidal Tile Identifier (horizontalXXverticalYY)
• CCC = Collection Version number
• YYYYDDDHHMMSS = Production Date and Time
• h5 = HDF-EOS (version 5) file format

Production Frequency:
~1900 file per day

Spatial Coverage:
Global

Spatial Resolution:
500m

File Size (MB):
~26

Citation:

Dataset Originator/Creator:
NASA Suomi-NPP/VIIRS Land SIPS/Land, Atmosphere Near real-time Capability for EOS (LANCE)Moderate Resolution Imaging Spectroradiometer (MODIS)

Data Authors:
Dr. Miguel O. Román

Dataset DOI:
https://doi.org/10.5067/VIIRS/VNP46A1G_NRT.002