S-NPP Product Descriptions: VNP46A1_NRT

Last update: January 04, 2021

Data Set Short Name:
VNP46A1_NRT

Data Set Long Name:
VIIRS/NPP Daily 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 first of two VIIRS DNB-based Near Real Time (NRT) datasets is a daily, top-of-atmosphere, at-sensor nighttime radiance product called VIIRS/NPP Daily Gridded Day Night Band 15 arc-second Linear Lat Lon Grid Night. Known by its short-name, VNP46A1_NRT, 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 = VNP46A1_NRT.AYYYYDDD.hXXvYY.VVV.h5

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

Production Frequency:
576 file per day

Spatial Coverage:
Global

Spatial Resolution:
500m

File Size (MB):
~35

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/VNP46A1_NRT.001