VNP30 Product File Specification
Version: V1.0.0
Revision: 0
Date: 17 January 2019
ESDT: VNP30
Product name: Ice Surface Temperature
Product Level: 2
PGE: 505
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 surface temperature (IST) algorithm and output data have been designed to be compatible with Version 6
MODIS ISTs 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 swath-level sea ice cover and ice surface temperature (IST) data are provided as separate products:
VNP29 (sea ice cover, release pending) and VNP30 (this data set). This decision by the the Science Team allows the data
to be produced at the spatial resolution of the underlying VIIRS acquisition bands: 375 m for sea ice cover (I-band) and
750 m for IST (M-band).
SDSs produced:
IST
IST_Basic_QA
IST_map
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/VNP30
Contents:
Global Metadata:
Name: Type: Num_Val: Source: Value:
AlgorithmType STRING 1 STIG "OPS"
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
LSIPS_AlgorithmVersion 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 "PGE505"
PGE_StartTime STRING 1 PGE Variable
Percent_ocean_in_swath STRING 1 STIG Variable
Platform_Short_Name STRING 1 STIG "NPP"
ProcessingCenter STRING 1 PGE "MODAPS-NASA"
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 "VNP30"
VersionID STRING 1 PGE "001"
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/VNP30.001"
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 Ice Surface Temperature 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 Ice Surface Temperature"
===============================================================================
SDS Name: latitude
Description: Latitude data
Number Type: DFNT_FLOAT32
Rank: 2
Dimension sizes:(3232,3200)
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:(3232,3200)
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: IST
Description: Ice Surface Temperature
Number Type: DFNT_UINT16
Rank: 2
Dimension sizes:(3232,3200)
Dimension Names:
Dimension0: "number_of_lines"
Dimension1: "number_of_pixels"
SDS Attributes:
Name: Type: Num_val: Source: Value:
long_name STRING string length PGE "Ice Surface Temperature"
valid_range DFNT_UINT16 2 PGE 21000,31300
_FillValue DFNT_UNIT16 1 PGE 65535
coordinates STRING 1 PGE "latitude longitude"
mask_meanings STRING 1 PGE "0-missing, 1-no_decision, 11-night, 25-land, 37-inland_water, 39-open_ocean"
mask_values DFNT_UINT16 6 PGE 0,1,11,25,37,39
scale_factor DFNT_FLOAT32 1 PGE 0.01
units STRING 1 PGE "K"
===============================================================================
SDS Name: IST_Basic_QA
Description: Basic QA of Ice Surface Temperature
Number Type: DFNT_UINT8
Rank: 2
Dimension sizes:(3232,3200)
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 of Ice Surface Temperature"
_FillValue DFNT_UNIT8 1 PGE 255
coordinates STRING 1 PGE "latitude longitude"
QA_value_meanings STRING 1 PGE "0-best, 1-day_good, 2-day_cloud, 3-night_good, 4-night_cloud, 5-other,6-poor"
mask_meanings STRING 1 PGE "237-inland_water, 253-land_mask, 254-bowtie_trim"
mask_values DFNT_UINT8 3 PGE 237, 253, 254
valid_range DFNT_UINT8 2 PGE 0,6
===============================================================================
SDS Name: IST_map
Description: Ice Surface Temperature with masks
Number Type: DFNT_UINT16
Rank: 2
Dimension sizes:(3232,3200)
Dimension Names:
Dimension0: "number_of_lines"
Dimension1: "number_of_pixels"
SDS Attributes:
Name: Type: Num_val: Source: Value:
long_name STRING string length PGE "Ice Surface Temperature with masks"
valid_range DFNT_UINT16 2 PGE 21000,31300
_FillValue DFNT_UNIT16 1 PGE 65535
coordinates STRING 1 PGE "latitude longitude"
mask_meanings STRING 1 PGE "0-missing, 1-no_decision, 11-night, 25-land, 37-inland_water, 39-open_ocean, 50-cloud"
mask_values DFNT_UINT16 7 PGE 0, 1, 11, 25, 37, 39, 50
scale_factor DFNT_FLOAT32 1 PGE 0.01
units STRING 1 PGE "K"
===============================================================================
SDS Name: QA_Flags
Description: Algorithm QA Flags for IST
Number Type: DFNT_UINT8
Rank: 2
Dimension sizes:(3232,3200)
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 IST"
coordinates STRING 1 PGE "latitude longitude"
comment STRING 1 PGE "No QA bit flags are set in this version, the dataset is place holder for future version that will have QA bit flags set"
===============================================================================