VNP02OBC - VIIRS/NPP On Board Calibrator (OBC)
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://www.jpss.noaa.gov/sciencedocuments/sciencedocs/2017-06/474-00090_OAD-VIIRS-CAL-GEO-SDR_I.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.
| Shortname: | VNP02OBC |
| Platform: | Suomi-NPP |
| Instrument: | VIIRS |
| Processing Level: | Level-1B |
| Spatial Resolution: | 750 m |
| Temporal Resolution: | 6 minute |
| ArchiveSets: | 5110, 5000, 5200 |
| Collection: | NPP VIIRS collection 1.0 (ArchiveSet 5110) |
| PGE Number: | PGE502 |
| File Naming Convention: | VNP02OBC.AYYYYDDD.HHMM.CCC.YYYYDDDHHMMSS.nc
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| Keywords: | Calibration, Reflectance |