S-NPP Product Descriptions: VNP21_NRT

Last update: October 16, 2023

Data Set Short Name:
VNP21_NRT

Data Set Long Name:
VIIRS/NPP Land Surface Temperature and Emissivity 6-Min L2 Swath 750m

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

Instrument:
Visible Infrared Imaging Radiometer Suite (VIIRS)

Product Description:

The Near Real Time (NRT) VIIRS/NPP Land Surface Temperature and Emissivity 6-Min L2 Swath 750m product (VNP21_NRT) is produced daily in 6-minute temporal increments of satellite acquisition. The VNP21_NRT product uses a physics-based algorithm to dynamically retrieve both the Land Surface Temperature (LST) and emissivity simultaneously for VIIRS thermal infrared bands M14 (8.55 µm), M15 (10.76 µm), and M16 (12 µm) at a spatial resolution of 750 meters.

The VNP21_NRT product is developed synergistically with the Moderate Resolution Imaging Spectroradiometer (MODIS) Land Surface Temperature and Emissivity (LST&E) Version 6.1 product (MOD21) using the same input atmospheric products and algorithmic approach based on the ASTER Temperature Emissivity Separation (TES) technique. The TES algorithm is combined with an improved Water Vapor Scaling (WVS) atmospheric correction scheme to stabilize the retrieval during very warm and humid conditions.
File_naming_convention = VNP21_NRT.AYYYYDDD.HHMM.CCC.YYYYDDDHHMMSS.nc

• AYYYYDDD = Acquisition Year and Day of Year
• HHMM = Hour and minute of acquisition
• CCC = Collection number
• YYYYDDDHHMMSS = Production Date and Time
• nc = NetCDF4

Production Frequency:
~240 file per day

Spatial Coverage:
Global

Spatial Resolution:
750m

File Size (MB):
~4

Citation:

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

Data Authors:
Glynn Hulley and Simon Hook

Dataset DOI:
http://doi.org/10.5067/VIIRS/VNP21_NRT.002