Collection 2 S-NPP Product Descriptions: VNP02GDC_NRT
Last update: January 31, 2022
Data Set Short Name:
VNP02GDC_NRT
Data Set Long Name:
VIIRS/NPP Moderate-Resolution Dual Gain Bands Calibrated Radiance 6-Min L1B Swath 750m NRT
Platform:
Suomi National Polar-Orbiting Partnership (S-NPP)
Instrument:
Visible-Infrared Imaging-Radiometer Suite (VIIRS)
Product Description:
The VIIRS Level-1 and Level-2 swath products are generated from the processing of 6 minutes of VIIRS data acquired during the NPP satellite overpass. The VIIRS sensor has 5 high-resolution imagery channels (I-bands) that have 32 detectors (32 rows of pixels per scan), with twice the resolution of the M-bands and the DNB, that span the wavelengths from 0.640 µm to 11.45 µm. There are also 7 dual-gain VIIRS bands. The dual gain moderate resolution bands (M1 to M5, M7 and M13) have 6304 samples and the other moderate resolution bands have 3200.
The Near Real Time (NRT) Calibrated Dual Gain product file, VNP02GDC, contains unaggregated, calibrated TOA radiances for those VIIRS sub-pixel samples that are aggregated along-scan during post-calibration ground processing. In other words, this file contains the calibrated M1 – M5, M7 and M13 dual gain band data from the nadir and near-nadir zones that would otherwise be discarded following post-calibration aggregation/Earth View Radiometric Calibration Unit.
For additional information, see the Operational Algorithm Description (OAD) Document for the L1B product (https://npp.gsfc.nasa.gov/sciencedocs/2015-08/474-00090_OAD-VIIRS-CAL-GEO-SDR_H.pdf). The document describes how VIIRS operates in space and provides the equations implemented by the L1B software to generate the MODIS Level-1 intermediate products. It is a summary document the presents the formulae and error budges used to transform VIIRS digital counts to radiance and reflectance.
file_naming_convention = VNP02GDC.AYYYYDDD.HHMM.CCC.nc
- AYYYYDDD = Acquisition Year and Day of Year
- HHMM = Hour and minute of acquisition
- CCC = Collection number
- nc = NetCDF4
Production Frequency:
240 files per day
Spatial Coverage:
Global
Spatial Resolution:
750m at nadir
File Size (MB):
~230
Related Links:
https://viirsland.gsfc.nasa.gov/index.html.
https://jointmission.gsfc.nasa.gov/suomi.html.
Citation:
We kindly request that you cite the use of this data set in a publication using the following citation.
Author (PI), et al., 2022. Product name as given on web site. NASA MODIS Adaptive Processing System, Goddard Space Flight Center, USA: [link as given on product site].
For example:
Dataset Originator/Creator:
VIIRS characterization Support Team (VCST)/ MODIS Adaptive Processing System (MODAPS)
Dataset DOI:
https://doi.org/10.5067/VIIRS/VNP02GDC_NRT.002
