Collection 2 S-NPP Product Descriptions: VNP02OBC_NRT
Last update: July 20, 2022
Data Set Short Name:
VNP02OBC_NRT
Data Set Long Name:
VIIRS/NPP On Board Calibrator (OBC) IP NRT
Platform:
Suomi National Polar-Orbiting Partnership (S-NPP)
Instrument:
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.
The VIIRS on-board calibrator and engineering data product is referred to by it's shortname, VNP02OBC. The VIIRS On Board Calibrator IP file contains space view, solar diffuser, on-board calibrator blackbody (OBCBB) view observations, the associated gain state and HAM side information, and all engineering and housekeeping data, including unscaled data from the Solar Diffuser Stability Monitor (SDSM)/VIIRS Earth View Radiometric Calibration Unit and the Solar Diffuser GEO angles.
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 = VNP02OBC.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):
~14
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:
Wolfe, R. E., G. Lin, M. Nishihama, K. P. Tewari, J. C. Tilton, and A. R. Isaacman (2013), Suomi NPP VIIRS prelaunch and on-orbit geometric calibration and characterization, J. Geophys. Res. Atmos., 118, 11508–11521, doi:10.1002/jgrd.50873.
Dataset Originator/Creator:
VIIRS characterization Support Team (VCST)/ MODIS Adaptive Processing System (MODAPS)
Dataset DOI:
https://doi.org/10.5067/VIIRS/VNP02OBC_NRT.002
