GHRSST Level 3U OSPO dataset v2.61 from VIIRS on S-NPP Satellite (GDS v2)
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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).
Dataset TypeOPEN
Processing Level3
CoverageRegion: Global
Northernmost Latitude: 90 degrees
Southernmost Latitude: -90 degrees
Westernmost Longitude: -180 degrees
Easternmost Longitude: 180 degrees
Time Span: 2012-Feb-01 to Present
Granule Time Span: 2012-Feb-01 to 2020-Jul-03
ResolutionSpatial Resolution: 0.02 degrees (Latitude) x 0.02 degrees (Longitude)
Temporal Resolution: 12 Hour
ProjectionType: Gridded
Detail: Geolocation information included for each pixel
Ellipsoid: WGS 84
Latency6 hours
Name: Suomi National Polar-orbiting Partnership (SUOMI-NPP)
Orbit Period: 101 minutes
Inclination Angle: 97.1 degrees
Ascending Node: 1970-Jan-01 00:00:00
Name: Visible Infrared Imaging Radiometer Suite (VIIRS)
Swath Width: 3040 km
Description: VIIRS is a 22-band radiometer to collect infrared and visible light for earth system monitoring

ProjectGroup for High Resolution Sea Surface Temperature (GHRSST)
Data ProviderCreator: NOAA Office of Satellite and Product Operations (OSPO)
Release Place: Suitland, MD, USA
Release Date: 2019-May-15
Keyword(s)NOAA, JPSS, VIIRS, OSPO, ACSPO, sea surface temperature, SST, L3U, GHRSST, GDS2, ospo, S-NPP, v2.61
Questions related to this dataset? Contact
User's Guide
GDS2 User Manual
Documentation on the GDS version 2 format specification
Project Materials
ACSPO Documents
Samples, Interface Control Document describing file contents, background ppt and other info
GHRSST Project
Portal to the GHRSST Global Data Assembly Center and data access
Journal References
Petrenko, B., et al., 2010
Petrenko, B., A. Ignatov, Y. Kihai, and A. Heidinger, 2010: Clear-Sky Mask for ACSPO. JTech, 27, 1609-1623
Petrenko, B., et al., 2014
Petrenko, B., A. Ignatov, Y. Kihai, J. Stroup, P. Dash, 2014: Evaluation and Selection of SST Regression Algorithms for JPSS VIIRS. JGR, 119, 4580-4599, doi: 10.1002/2013JD020637
Additional Sites
Dash, P., A. Ignatov, Y. Kihai
Xu, F.
Liang, X.
What is SST?
Sea Surface Temperature measurement description.
Citation NOAA Office of Satellite and Product Operations (OSPO). 2019. GHRSST Level 3U OSPO dataset v2.61 from VIIRS on S-NPP Satellite (GDS v2). Ver. 2.61. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at

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For more information see Data Citations and Acknowledgments.

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