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Title Sum-
Institution Dataset ID
 data       graph  M    files  public AVHRR Pathfinder Version 5.3 L3-Collated (L3C) SST, Global, 0.0417°, 1981-present,
Nighttime (1 Day Composite)
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The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL _NCProperties String version=2,netcdf=4.8.1,hdf5=1.10.7
attribute NC_GLOBAL acknowledgement String Please acknowledge the use of these data with the following statement: These data were provided by GHRSST and the NOAA National Centers for Environmental Information (NCEI). This project was supported in part by a grant from the NOAA Climate Data Record (CDR) Program for satellites.
attribute NC_GLOBAL cdm_data_type String Grid
attribute NC_GLOBAL cdr_id String gov.noaa.ncdc:C00983
attribute NC_GLOBAL cdr_program String NOAA Climate Data Record Program for satellites
attribute NC_GLOBAL cdr_variable String sea_surface_temperature
attribute NC_GLOBAL comment String SST from AVHRR Pathfinder
attribute NC_GLOBAL contributor_name String Robert Evans
attribute NC_GLOBAL contributor_role String Principal Investigator
attribute NC_GLOBAL Conventions String CF-1.6, ACDD-1.3, COARDS
attribute NC_GLOBAL creator_email String Kenneth.Casey at
attribute NC_GLOBAL creator_institution String US DOC; NOAA; National Environmental Satellite Data and Information Service; National Centers for Environmental Information
attribute NC_GLOBAL creator_name String Kenneth S. Casey
attribute NC_GLOBAL creator_type String person
attribute NC_GLOBAL creator_url String (external link)
attribute NC_GLOBAL date_created String 2024-02-07T18:05:43Z
attribute NC_GLOBAL date_issued String 2016-03-01T00:00:00Z
attribute NC_GLOBAL date_metadata_modified String 2016-01-25T00:00:00Z
attribute NC_GLOBAL date_modified String 2024-02-07T18:05:43Z
attribute NC_GLOBAL day_or_night String Night
attribute NC_GLOBAL Easternmost_Easting double 179.979
attribute NC_GLOBAL gds_version_id String 2.0
attribute NC_GLOBAL geospatial_bounds String -180.0000 -90.0000, 180.0000 90.0000
attribute NC_GLOBAL geospatial_bounds_crs String EPSG:4326
attribute NC_GLOBAL geospatial_lat_max double 89.979
attribute NC_GLOBAL geospatial_lat_min double -89.979
attribute NC_GLOBAL geospatial_lat_resolution double 0.04166658948830748
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double 179.979
attribute NC_GLOBAL geospatial_lon_min double -179.979
attribute NC_GLOBAL geospatial_lon_resolution double 0.041666628081953934
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL history String smigen_both ifile=2023365.b4kd1-pf53ap-n19-sst.hdf ofile=2023365.i4kd1-pf53ap-n19-sst.hdf prod=sst datamin=-3.0 datamax=40.0 precision=I projection=RECT resolution=4km gap_fill=2 ; /data/ncei1/ncei.home/ksaha/PFv53_main/Converters/bin/Converter/hdf2nc_PFV53_L3C.x -v /data/ncei1/ncei.home/ksaha/PFv53_main/Converters/Data_PFV53/PFV53_HDF_L3C/2023/2023365.i4kd1-pf53ap-n19-sst.hdf
attribute NC_GLOBAL id String AVHRR_Pathfinder-NCEI-L3C-v5.3
attribute NC_GLOBAL infoUrl String (external link)
attribute NC_GLOBAL institution String NCEI
attribute NC_GLOBAL instrument String AVHRR-3
attribute NC_GLOBAL instrument_vocabulary String NASA Global Change Master Directory (GCMD) Science Keywords v8.4
attribute NC_GLOBAL keywords String 10m, advanced, aerosol, aerosol_dynamic_indicator, analysis, area, atmosphere, atmospheric, avhrr, bias, centers, climate, collated, cryosphere, data, deviation, difference, distribution, dt_analysis, dynamic, Earth Science > Atmosphere > Atmospheric Winds > Surface Winds, Earth Science > Cryosphere > Sea Ice > Ice Extent, Earth Science > Oceans > Ocean Temperature > Sea Surface Temperature, Earth Science > Oceans > Sea Ice > Ice Extent, environmental, error, estimate, extent, flag, flags, fraction, ghrsst, global, high, high-resolution, ice, ice distribution, indicator, information, l2p, l2p_flags, l3-collated, l3c, level, national, ncei, noaa, ocean, oceans, optical, optical properties, pathfinder, pathfinder_quality_level, pixel, properties, quality, quality_level, radiometer, record, reference, resolution, sea, sea_ice_area_fraction, sea_ice_fraction, sea_surface_skin_temperature, sea_surface_temperature, sensor, single, skin, speed, sses, sses_bias, sses_standard_deviation, sst, sst_dtime, standard, statistics, surface, temperature, time, version, very, vhrr, wind, wind_speed, winds
attribute NC_GLOBAL keywords_vocabulary String GCMD Science Keywords
attribute NC_GLOBAL license String These data are available for use without restriction.
The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.
attribute NC_GLOBAL metadata_link String (external link)
attribute NC_GLOBAL naming_authority String org.ghrsst
attribute NC_GLOBAL ncei_template_version String NCEI_NetCDF_Grid_Template_v2.0
attribute NC_GLOBAL Northernmost_Northing double 89.979
attribute NC_GLOBAL orbit_node String Descending
attribute NC_GLOBAL platform String NOAA-19
attribute NC_GLOBAL platform_vocabulary String NASA Global Change Master Directory (GCMD) Science Keywords v8.4
attribute NC_GLOBAL principal_year_day_for_collated_orbits String 2023365
attribute NC_GLOBAL processing_level String L3C
attribute NC_GLOBAL product_version String PFV5.3
attribute NC_GLOBAL program String NOAA Climate Data Record (CDR) Program for satellites
attribute NC_GLOBAL project String Group for High Resolution Sea Surface Temperature
attribute NC_GLOBAL publisher_email String ghrsst-po at
attribute NC_GLOBAL publisher_name String GHRSST Project Office
attribute NC_GLOBAL publisher_type String group
attribute NC_GLOBAL publisher_url String (external link)
attribute NC_GLOBAL references String and Casey, K.S., T.B. Brandon, P. Cornillon, and R. Evans: The Past, Present and Future of the AVHRR Pathfinder SST Program, in Oceanography from Space: Revisited, eds. V. Barale, J.F.R. Gower, and L. Alberotanza, Springer, 2010. DOI: 10.1007/978-90-481-8681-5_16. (external link)
attribute NC_GLOBAL sea_name String World-Wide Distribution
attribute NC_GLOBAL sensor String AVHRR-3
attribute NC_GLOBAL source String AVHRR_GAC-CLASS-L1B-NOAA_19-v1
attribute NC_GLOBAL sourceUrl String (external link)
attribute NC_GLOBAL Southernmost_Northing double -89.979
attribute NC_GLOBAL spatial_resolution String 0.0416667 degree
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v70
attribute NC_GLOBAL summary String Advanced Very High Resolution Radiometer (AVHRR) Pathfinder Version 5.3 L3-Collated (L3C) sea surface temperature. This netCDF-4 file contains sea surface temperature (SST) data produced as part of the AVHRR Pathfinder SST Project. These data were created using Version 5.3 of the Pathfinder algorithm and the file is nearly but not completely compliant with the Global High-Resolution Sea Surface Temperature (GHRSST) Data Specifications V2.0 (GDS2). The sses_bias and sses_standard_deviation variables are empty. Full compliance with GDS2 specifications will be achieved in the future Pathfinder Version 6. These data were created by the NOAA National Centers for Environmental Information (NCEI).
attribute NC_GLOBAL time_coverage_duration String P1D
attribute NC_GLOBAL time_coverage_end String 2023-12-31T12:00:00Z
attribute NC_GLOBAL time_coverage_resolution String P1D
attribute NC_GLOBAL time_coverage_start String 1981-08-25T12:00:00Z
attribute NC_GLOBAL title String AVHRR Pathfinder Version 5.3 L3-Collated (L3C) SST, Global, 0.0417°, 1981-present, Nighttime (1 Day Composite)
attribute NC_GLOBAL Westernmost_Easting double -179.979
dimension time   double nValues=15439, evenlySpaced=false, averageSpacing=1 day 0h 2m 48s
attribute time _CoordinateAxisType String Time
attribute time actual_range double 3.675888E8, 1.704024E9
attribute time axis String T
attribute time comment String This is the centered, reference time.
attribute time ioos_category String Time
attribute time long_name String Centered Time
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time units String seconds since 1970-01-01T00:00:00Z
dimension latitude   float nValues=4320, evenlySpaced=true, averageSpacing=-0.04166658948830748
attribute latitude _CoordinateAxisType String Lat
attribute latitude actual_range float -89.979, 89.979
attribute latitude axis String Y
attribute latitude grids String uniform grids from 90.0 to -90.0 by 0.04
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude reference_datum String Geographical coordinates, WGS84 datum
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
attribute latitude valid_max float 90.0
attribute latitude valid_min float -90.0
dimension longitude   float nValues=8640, evenlySpaced=true, averageSpacing=0.041666628081953934
attribute longitude _CoordinateAxisType String Lon
attribute longitude actual_range float -179.979, 179.979
attribute longitude axis String X
attribute longitude grids String uniform grids from -180 to 180 by 0.04
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude reference_datum String Geographical coordinates, WGS84 datum
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
attribute longitude valid_max float 180.0
attribute longitude valid_min float -180.0
variable sea_surface_temperature   double time, latitude, longitude
attribute sea_surface_temperature _FillValue double NaN
attribute sea_surface_temperature ancillary_variables String quality_level pathfinder_quality_level l2p_flags
attribute sea_surface_temperature colorBarMaximum double 32.0
attribute sea_surface_temperature colorBarMinimum double 0.0
attribute sea_surface_temperature comment String Skin temperature of the ocean
attribute sea_surface_temperature coverage_content_type String physicalMeasurement
attribute sea_surface_temperature grid_mapping String crs
attribute sea_surface_temperature ioos_category String Temperature
attribute sea_surface_temperature long_name String NOAA Climate Data Record of sea surface skin temperature
attribute sea_surface_temperature platform String NOAA-19
attribute sea_surface_temperature source String AVHRR_GAC-CLASS-L1B-NOAA_19-v1
attribute sea_surface_temperature standard_name String sea_surface_skin_temperature
attribute sea_surface_temperature units String degree_C
attribute sea_surface_temperature valid_max double 45.0
attribute sea_surface_temperature valid_min double -1.7999999999999545
variable dt_analysis   double time, latitude, longitude
attribute dt_analysis _FillValue double NaN
attribute dt_analysis colorBarMaximum double 5.0
attribute dt_analysis colorBarMinimum double 0.0
attribute dt_analysis comment String The difference between this SST and the previous day's SST.
attribute dt_analysis coverage_content_type String auxiliaryInformation
attribute dt_analysis grid_mapping String crs
attribute dt_analysis ioos_category String Statistics
attribute dt_analysis long_name String deviation from last SST analysis
attribute dt_analysis platform String NOAA-19
attribute dt_analysis references String AVHRR_OI, with inland values populated from AVHRR_Pathfinder daily climatological SST. For more information on this reference field see
attribute dt_analysis source String NOAA Daily 25km Global Optimally Interpolated Sea Surface Temperature (OISST)
attribute dt_analysis units String degree_C
attribute dt_analysis valid_max double 12.700000000000001
attribute dt_analysis valid_min double -12.700000000000001
variable wind_speed   byte time, latitude, longitude
attribute wind_speed colorBarMaximum double 15.0
attribute wind_speed colorBarMinimum double 0.0
attribute wind_speed comment String These wind speeds were created by NCEP-DOE Atmospheric Model Intercomparison Project (AMIP-II) reanalysis (R-2) and represent winds at 10 metres above the sea surface.
attribute wind_speed coverage_content_type String auxiliaryInformation
attribute wind_speed grid_mapping String crs
attribute wind_speed height String 10 m
attribute wind_speed ioos_category String Wind
attribute wind_speed long_name String 10m wind speed
attribute wind_speed source String NCEP/DOE AMIP-II Reanalysis (Reanalysis-2):,
attribute wind_speed standard_name String wind_speed
attribute wind_speed time_offset double 3.1036
attribute wind_speed units String m s-1
attribute wind_speed valid_max byte 127
attribute wind_speed valid_min byte -127
variable sea_ice_fraction   double time, latitude, longitude
attribute sea_ice_fraction _FillValue double NaN
attribute sea_ice_fraction colorBarMaximum double 1.0
attribute sea_ice_fraction colorBarMinimum double 0.0
attribute sea_ice_fraction comment String Sea ice concentration data are taken from the EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSISAF) Global Daily Sea Ice Concentration Reprocessing Data Set ( when these data are available. The data are reprojected and interpolated from their original polar stereographic projection at 10km spatial resolution to the 4km Pathfinder Version 5.3 grid. When the OSISAF data are not available for both hemispheres on a given day, the sea ice concentration data are taken from the sea_ice_fraction variable found in the L4 GHRSST DailyOI SST product from NOAA/NCDC, and are interpolated from the 25km DailyOI grid to the 4km Pathfinder Version 5.3 grid.
attribute sea_ice_fraction coverage_content_type String auxiliaryInformation
attribute sea_ice_fraction grid_mapping String crs
attribute sea_ice_fraction ioos_category String Ice Distribution
attribute sea_ice_fraction long_name String sea ice fraction
attribute sea_ice_fraction references String Reynolds, et al.(2006) Daily High-resolution Blended Analyses. Available at
attribute sea_ice_fraction source String NOAA/NESDIS/NCDC Daily optimum interpolation(OI) SST on 1/4-degree grid:
attribute sea_ice_fraction standard_name String sea_ice_area_fraction
attribute sea_ice_fraction time_offset double 10.0
attribute sea_ice_fraction units String %
attribute sea_ice_fraction valid_max double 1.27
attribute sea_ice_fraction valid_min double -1.27
variable quality_level   byte time, latitude, longitude
attribute quality_level _FillValue byte 127
attribute quality_level ancillary_variables String pathfinder_quality_level
attribute quality_level colorBarContinuous String false
attribute quality_level colorBarMaximum double 6.0
attribute quality_level colorBarMinimum double 0.0
attribute quality_level colorBarNSections int 6
attribute quality_level comment String These are the overall quality indicators and are used for all GHRSST SSTs. Note, the native Pathfinder processing system returns quality levels ranging from 0 to 7 (7 is best quality; -1 represents missing data) and has been converted to the extent possible into the six levels required by the GDS2 (ranging from 0 to 5, where 5 is best). Below is the conversion table:
GDS2 required quality_level 5 = native Pathfinder quality level 7 == best_quality
GDS2 required quality_level 4 = native Pathfinder quality level 4-6 == acceptable_quality
GDS2 required quality_level 3 = native Pathfinder quality level 2-3 == low_quality
GDS2 required quality_level 2 = native Pathfinder quality level 1 == worst_quality
GDS2 required quality_level 1 = native Pathfinder quality level 0 = bad_data
GDS2 required quality_level 0 = native Pathfinder quality level -1 = missing_data
The original Pathfinder quality level is recorded in the optional variable pathfinder_quality_level.
attribute quality_level coverage_content_type String qualityInformation
attribute quality_level flag_meanings String no_data bad_data worst_quality low_quality acceptable_quality best_quality
attribute quality_level flag_values byte 0, 1, 2, 3, 4, 5
attribute quality_level grid_mapping String crs
attribute quality_level ioos_category String Quality
attribute quality_level long_name String quality level of SST pixel
attribute quality_level platform String NOAA-19
attribute quality_level source String AVHRR_GAC-CLASS-L1B-NOAA_19-v1
attribute quality_level units String 1
attribute quality_level valid_max byte 5
attribute quality_level valid_min byte 1
variable pathfinder_quality_level   byte time, latitude, longitude
attribute pathfinder_quality_level _FillValue byte 127
attribute pathfinder_quality_level colorBarContinuous String false
attribute pathfinder_quality_level colorBarMaximum double 8.0
attribute pathfinder_quality_level colorBarMinimum double 0.0
attribute pathfinder_quality_level colorBarNSections int 8
attribute pathfinder_quality_level comment String This variable contains the native Pathfinder processing system quality levels, ranging from 0 to 7, where 0 is worst and 7 is best. And value -1 represents missing data.
attribute pathfinder_quality_level coverage_content_type String qualityInformation
attribute pathfinder_quality_level flag_meanings String bad_data worst_quality low_quality low_quality acceptable_quality acceptable_quality acceptable_quality best_quality
attribute pathfinder_quality_level flag_values byte 0, 1, 2, 3, 4, 5, 6, 7
attribute pathfinder_quality_level grid_mapping String crs
attribute pathfinder_quality_level ioos_category String Quality
attribute pathfinder_quality_level long_name String Pathfinder SST quality flag
attribute pathfinder_quality_level platform String NOAA-19
attribute pathfinder_quality_level source String AVHRR_GAC-CLASS-L1B-NOAA_19-v1
attribute pathfinder_quality_level units String 1
attribute pathfinder_quality_level valid_max byte 7
attribute pathfinder_quality_level valid_min byte 0
variable l2p_flags   short time, latitude, longitude
attribute l2p_flags colorBarMaximum double 300.0
attribute l2p_flags colorBarMinimum double 0.0
attribute l2p_flags comment String Bit zero (0) is always set to zero to indicate infrared data. Bit one (1) is set to zero for any pixel over water (ocean, lakes and rivers). Land pixels were determined by rasterizing the Global Self-consistent Hierarchical High-resolution Shoreline (GSHHS) Database from the NOAA National Geophysical Data Center. Any 4 km Pathfinder pixel whose area is 50% or more covered by land has bit one (1) set to 1. Bit two (2) is set to 1 when the sea_ice_fraction is 0.15 or greater. Bits three (3) and four (4) indicate lake and river pixels, respectively, and were determined by rasterizing the US World Wildlife Fund's Global Lakes and Wetlands Database. Any 4 km Pathfinder pixel whose area is 50% or more covered by lake has bit three (3) set to 1. Any 4 km Pathfinder pixel whose area is 50% or more covered by river has bit four (4) set to 1.
attribute l2p_flags coverage_content_type String auxiliaryInformation
attribute l2p_flags flag_masks short 1, 2, 4, 8, 16, 32, 64, 128, 256
attribute l2p_flags flag_meanings String microwave land ice lake river reserved_for_future_use unused_currently unused_currently unused_currently
attribute l2p_flags grid_mapping String crs
attribute l2p_flags ioos_category String Quality
attribute l2p_flags long_name String L2P flags
attribute l2p_flags platform String NOAA-19
attribute l2p_flags source String AVHRR_GAC-CLASS-L1B-NOAA_19-v1
attribute l2p_flags units String 1
attribute l2p_flags valid_max short 256
attribute l2p_flags valid_min short 0

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.

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