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GHRSST Level 3U NOAA STAR SST v2.80 from VIIRS on S-NPP Satellite. DOI:

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GHRSST Level 3U OSPO dataset v2.61 from VIIRS on S-NPP Satellite (GDS v2)

3 Publications Cited this Dataset
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Short NameVIIRS_NPP-OSPO-L3U-v2.61
DescriptionThe Joint Polar Satellite System (JPSS), starting with S-NPP launched on 28 October 2011, is the new generation of the US Polar Operational Environmental Satellites (POES). The Suomi National Polar-orbiting Partnership (S-NPP) is a collaboration between NASA and NOAA. The ACSPO SNPP/VIIRS L3U (Level 3 Uncollated) product is a gridded version of the ACSPO SNPP/VIIRS L2P product available here The L3U output files are 10-minute granules in netCDF4 format, compliant with the GHRSST Data Specification version 2 (GDS2). There are 144 granules per 24hr interval, with a total data volume of 500MB/day. Fill values are reported at all invalid pixels, including pixels with >5 km inland. For each valid water pixel (defined as ocean, sea, lake or river, and up to 5 km inland), the following layers are reported: SSTs, ACSPO clear-sky mask (ACSM; provided in each grid as part of l2p_flags, which also includes day/night, land, ice, twilight, and glint flags), NCEP wind speed, and ACSPO SST minus reference (Canadian Met Centre 0.1deg L4 SST; available at ). Only L2P SSTs with QL=5 were gridded, so all valid SSTs are recommended for the users. Per GDS2 specifications, two additional Sensor-Specific Error Statistics layers (SSES bias and standard deviation) are reported in each pixel with valid SST. The ACSPO VIIRS L3U product is monitored and validated against iQuam in situ data (Xu and Ignatov, 2014) in SQUAM (Dash et al, 2010).
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NameLong NameUnit
dt_analysisdeviation from SST referencekelvin
l2p_flagsL2P flags
or_number_of_pixelsnumber of pixels from the L2Ps contributing to the SST value1
quality_levelquality level of SST pixel
satellite_zenith_anglesatellite zenith angledegrees
sea_surface_temperaturesea surface sub-skin temperaturekelvin
sses_biasSSES bias estimatekelvin
sses_standard_deviationSSES standard deviationkelvin
sst_dtimetime difference from reference timeseconds
timereference time of sst fileseconds since 1981-01-01 00:00:00
wind_speedwind speedm s-1
Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.
Citation NOAA Office of Satellite and Product Operations (OSPO). 2019. GHRSST Level 3U NOAA/ACSPO SST from VIIRS on S-NPP. Ver. 2.61. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at

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Journal Reference Petrenko, B., A. Ignatov, Y. Kihai, J. Stroup, and P. Dash, 2014, Evaluation and selection of SST regression algorithms for JPSS VIIRS, J. Geophys. Res. Atmos., 119, doi:10.1002/2013JD020637