VNP29 Product File Specification Version: V1.0.0 Revision: 0 Date: 17 January 2019 ESDT: VNP29 Product name: Sea Ice Product Level: 2 PGE: 508 Point of Contact: George Riggs SSAI NASA, GSFC, Code 971 Greenbelt, MD 20771 301-614-5650 George.A.Riggs.1@gsfc.nasa.gov Principal Investigator: Dorothy K. Hall NASA, GSFC, Code 971 Greenbelt, MD 20771 301-614-5771 Dorothy.K.Hall@nasa.gov Co-Investigator: George Riggs SSAI NASA, GSFC, Code 971 Greenbelt, MD 20771 301-614-5650 George.A.Riggs.1@gsfc.nasa.gov Mark Tschudi University of Colorado ECNT 320, 431 UCB, Boulder, Colorado 80309 303-492-8274 mark.tschudi@colorado.edu Description: The VIIRS sea ice extent algorithm and output data have been designed to be compatible with Version 6 MODIS sea ice extent from Aqua and Terra, to ensure continuity between the collections and facilitate climate-data records (CDRs) from the three sensors. Differences in the algorithms reflect physical differences between the instruments, for example spatial resolution and the location of spectral bands. Unlike MODIS, VIIRS sea ice cover and ice surface temperature (IST) are being produced as separate products: VNP29 (this data set) and VNP30 (IST). This decision allows the data to be produced at the spatial resolution of the underlying acquisition bands, or 375 m for sea ice cover (I-band) and 750 m for IST (M-band). SDSs produced: SeaIceCover_Map SeaIceCOver_Basic_QA Algorithm_QA_Flags latitude longitude The data product and algorithm are described in the VIIRS Sea Ice Data Product User Guide. The user should refer to that document for detailed description of the product, how to interpret the product and attributes (metadata). Other information may be found at https://nsidc.org/data/VNP29 Contents: Global Metadata: Name: Type: Num_Val: Source: Value: AlgorithmType STRING 1 STIG "OPS" AlgorithmVersion STRING 1 STIG Variable CloudCover STRING 1 STIG Variable Conventions STRING 1 STIG Variable DayNightFlag STRING 1 STIG "Day" EastBoundingCoord FLOAT 1 STIG Variable WestBoundingCoord FLOAT 1 STIG Variable NorthBoundingCoord FLOAT 1 STIG Variable SouthBoundingCoord FLOAT 1 STIG Variable GRingPointLongitude DOUBLE 4 PGE Variable GRingPointLatitude DOUBLE 4 PGE Variable RangeEndingDate STRING 1 PGE Variable RangeEndingTime STRING 1 PGE Variable RangeBeginningDate STRING 1 PGE Variable RangeBeginningTime STRING 1 PGE Variable StartTime STRING 1 PGE Variable EndTime STRING 1 PGE Variable IceCover STRING 1 STIG Variable InputPointer STRING 3 PGE Variable InstrumentShortname STRING 1 PGE "VIIRS" LocalGranuleID STRING 1 PGE Variable LongName STRING 1 STIG "VIIRS/NPP Sea Ice Cover 6-Min L2 Swath 375m" PGEVersion STRING 1 PGE Variable PGE_EndTime STRING 1 PGE Variable PGE_Name STRING 1 PGE "PGE508" PGE_StartTime STRING 1 PGE Variable Percent_ocean_in_swath STRING 1 STIG Variable Platform_Short_Name STRING 1 STIG "NPP" ProcessVersion STRING 1 STIG Variable ProcessingEnvironment STRING 1 PGE Variable ProductionTime DATETIME1 TK Variable ProxyDataType STRING 1 STIG "Operational Data" Resolution STRING 1 STIG "Imagery" SatelliteInstrument STRING 1 PGE "NPP_OPS" ShortName STRING 1 MCF "VNP29" cdm_data_type STRING 1 PGE "swath" creator_email STRING 1 PGE "modis-ops@lists.nasa.gov" creator_url STRING 1 PGE "http://ladsweb.nascom.nasa.gov" identifier_product_doi STRING 1 PGE "10.5067/VIIRS/VNP29.001" identifier_product_doi_authority STRING 1 PGE "http://dx.doi.org" institution STRING 1 PGE "NASA Goddard Space Flight Center" keywords_vocabulary STRING 1 PGE "NASA Global Change Master Directory (GCMD) Science Keywords" license STRING 1 PGE "http://science.nasa.gov/earth-science/earth-science-data/data-information-policy/" naming_authority STRING 1 PGE "gov.nasa.gsfc.VIIRSland" processing_level STRING 1 PGE "2" project STRING 1 PGE "VIIRS Land SIPS Sea Ice Cover Project" publisher_email STRING 1 PGE "modis-ops@lists.nasa.gov" publisher_name STRING 1 PGE "LAADS" publisher_url STRING 1 PGE "http://ladsweb.nascom.nasa.gov" stdname_vocabulary STRING 1 PGE "NetCDF Climate and Forecast (CF) Metadata Convention" title STRING 1 STIG "VIIRS Sea Ice Cover" =============================================================================== SDS Name: latitude Description: Latitude data Number Type: DFNT_FLOAT32 Rank: 2 Dimension sizes:(6464,6400) Dimension Names: Dimension0: "number_of_lines" Dimension1: "number_of_pixels" SDS Attributes: Name: Type: Num_val: Source: Value: long_name STRING 1 PGE "Latitude data" units STRING 1 PGE "degrees_north" valid_range DFNT_FLOAT32 2 PGE -90.00000, 90.0000 _FillValue DFNT_FLOAT32 1 PGE -999.0000 =============================================================================== SDS Name: longitude Description: Longitude data Number Type: DFNT_FLOAT32 Rank: 2 Dimension sizes:(6464,6400) Dimension Names: Dimension0: "number_of_lines" Dimension1: "number_of_pixels" SDS Attributes: Name: Type: Num_val: Source: Value: long_name STRING 1 PGE "Longitude data" units STRING 1 PGE "degrees_east" valid_range DFNT_FLOAT32 2 PGE -180.00000, 180.0000 _FillValue DFNT_FLOAT32 1 PGE -999.0000 =============================================================================== SDS Name: SeaIceCover_Map Description: Sea Ice Cover map with masks Number Type: DFNT_UINT8 Rank: 2 Dimension sizes:(6464,6400) Dimension Names: Dimension0: "number_of_lines" Dimension1: "number_of_pixels" SDS Attributes: Name: Type: Num_val: Source: Value: long_name STRING string length PGE "Sea Ice Cover map with masks" valid_range DFNT_UINT8 2 PGE 0,100 _FillValue DFNT_UNIT8 1 PGE 255 coordinates STRING 1 PGE "latitude longitude" mask_meanings STRING 1 PGE "200-missing, 201-no_decision, 211-night, 225-land, 237-inland_water, 250-cloud, 252-unusable_L1B_data, 253-bowtie_trim, 254-no_L1B_data" mask_values DFNT_UINT8 9 PGE 200, 201, 211, 225, 237, 250, 252, 253, 254 =============================================================================== SDS Name: Algorithm_QA_Flags Description: Algorithm QA Flags for Ice Cover Number Type: DFNT_UINT8 Rank: 2 Dimension sizes:(6464,6400) Dimension Names: Dimension0: "number_of_lines" Dimension1: "number_of_pixels" SDS Attributes: Name: Type: Num_val: Source: Value: long_name STRING string length PGE "Algorithm QA Flags for Ice Cover" _FillValue DFNT_UNIT8 1 PGE 0 coordinates STRING 1 PGE "latitude longitude" flag_masks STRING 1 PGE "1b, 2b, 4b, 8b, 16b, 32b, 64b, 128b" flag_meanings STRING 1 PGE "spare low_visible_screen low_NDSI_screen spare spare high_SWIR_screen/flag spare solar_zenith_flag" =============================================================================== SDS Name: SeaIceCover_Basic_QA Description: Basic QA Ice Cover Number Type: DFNT_UINT8 Rank: 2 Dimension sizes:(6464,6400) Dimension Names: Dimension0: "number_of_lines" Dimension1: "number_of_pixels" SDS Attributes: Name: Type: Num_val: Source: Value: long_name STRING string length PGE "Basic QA Ice Cover" _FillValue DFNT_UNIT8 1 PGE 255 coordinates STRING 1 PGE "latitude longitude" QA_value_meanings STRING 1 PGE "0-best, 1-good, 2-poor, 3-bad, 4-other" mask_meanings STRING 1 PGE "211-night, 225-land, 237-inland_water, 250-cloud, 252-unusable_L1B_data, 253-bowtie_trim, 254-no_L1B_data" mask_values DFNT_UINT8 7 PGE 211, 225, 237, 250, 252, 253, 254 valid_range DFNT_UINT8 2 PGE 0,4 ===============================================================================