VIIRS - Level-1 / Level-0

Overview

The August 2021 release represents the latest versions of NASA VIIRS Level-1 products for both SNPP VIIRS (C2.0) and JPSS-1 VIIRS (C2.1). They include two sets of three products (that each relate to image-resolution, moderate-resolution, and day-night band) that provide calibrated radiances and geolocation products. In order to allow enough time for our user community to transition to the new Level-1 product versions, the VIIRS Land SIPS will continue to produce the earlier product versions for both SNPP VIIRS (C1.0) and JPSS-1 VIIRS (C2.0) through the summer of 2022, and subsequently decommission them by the end of 2022.

Product Information

Product Details


Product Name Suomi NPP JPSS1
Imagery Resolution 6-Min L1B Swath 375m
Moderate Resolution 6-Min L1B Swath 750m
Day/Night Band 6-Min L1B Swath 750m
Imagery Resolution Terrain-Corrected Geolocation 6-Min L1 Swath 375m
Moderate Resolution Terrain-Corrected Geolocation 6-Min L1 Swath 750m
Day/Night Band Moderate Resolution Terrain-Corrected Geolocation 6-Min L1 Swath 750m
Imagery Resolution Terrain-Corrected Geolocation 6-Min L1 Swath 375m Light
Moderate Resolution Terrain-Corrected Geolocation 6-Min L1 Swath 750m Light


Interface Data Processing Segment (IDPS) Product Name Suomi NPP
Imagery Resolution Terrain-Corrected Geolocation 6-Min L1 Swath IP 375m
Moderate Resolution Terrain-Corrected Geolocation 6-Min L1 Swath IP 750m
Day/Night Band Terrain-Corrected Geolocation 6-Min L1 Swath IP
Day/Night Band 6-Min L1 Swath SDR 750m
Imagery Resolution 6-Min L1 Swath SDR 375m
Moderate Resolution 6-Min L1 Swath SDR and GEO 750m
On Board Calibrator (OBC) IP

NOTE: The IDPS heritage products are nearly identical to their NASA counterpart (to within 0.5%), and are produced using the Mx8.11 version of the IDPS L1B SDR process with the NASA VIIRS Characterization Support Team-provided calibration Look-Up Tables. We expect to produce these products through the summer of 2022, and subsequently decommission them by the end of 2022.


Non-Public Product Name Suomi NPP
Raw Radiences in Counts 6-Min L1A Swath
Dual Gain Intermediate Product
On Board Calibrator (OBC)

NOTE: The VNP01 Level-1A data products are held in a rolling archive for 45 days before they are removed. These products are available to users via the Processing-on-Demand (POD) mechanism.

Overview

The VIIRS Suomi NPP (SNPP) Level-0 comprises raw instrument data packets that are used to generate calibrated and geolocated VIIRS Level-1 products. The Earth Observing System Data and Operations System (EDOS) facility, located in the Goddard Space Flight Center (GSFC), is the entity that generates and delivers the Level-0 data to the Science Investigator-led Processing Systems (SIPS) that are responsible for higher-level data production.

EDOS generates Production Data Sets (PDS) from the SNPP-derived return-link instrument packet data that are in CCSDS https://public.ccsds.org/default.aspx (Consultative Committee for Space Data Systems) format from either single or multiple Application Process Identifiers (APID), a PDS Construction Record, and a Production Data Set Delivery Record (PDR). Generating PDS generally involves sorting packets by Spacecraft Identification (SCID)/APID, identifying data gaps, producing quality summaries and accounting information, and time-ordering the packets. PDS production data are of two types: either session-based (S-PDS) or time-based (T-PDS). An S-PDS contains instrument or spacecraft packet data for a single downlink (approximately 1 orbit), while a T-PDS contains data for a specified time period that spans 2 hours. The following S-PDS and T-PDS products are available from LAADS Find Data.

Product Information

  • DOI:
    • refer to individual product page (below) for the appropriate DOI , citation text, and file spec for that product

Product Details


Session Based Product Name SNPP | JPSS1
Level 0 Raw Instrument Packets APID 000 (1 session)
Level 0 Raw Instrument Packets APID 008 (1 session)
Level 0 Raw Instrument Packets APID 011 (1 session)
Level 0 Raw Instrument Packets APID 768 (1 session)
Level 0 Raw Instrument Packets APID 769 (1 session)
Level 0 Raw Instrument Packets APID 773 (1 session)
Level 0 Raw Instrument Packets APID 780 (1 session)
Level 0 Raw Instrument Packets Science APIDs (1 session)


Time Based Product Name SNPP | JPSS1
Level 0 Raw Instrument Packets APID 000 (2 hours)
Level 0 Raw Instrument Packets APID 008 (2 hours)
Level 0 Raw Instrument Packets APID 011 (2 hours)
Level 0 Raw Instrument Packets APID 768 (2 hours)
Level 0 Raw Instrument Packets Science APIDs (2 hours)