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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.
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.