HDF5 file, superblock version 2
group /
	attribute Conventions = "CF-1.6, ACDD-1.3"
	attribute acknowledgement = "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 cdm_data_type = "Grid"
	attribute cdr_id = "gov.noaa.ncdc:C00983"
	attribute cdr_program = "NOAA Climate Data Record Program for satellites"
	attribute cdr_variable = "sea_surface_temperature"
	attribute comment = "SST from AVHRR Pathfinder"
	attribute contributor_name = "Robert Evans"
	attribute contributor_role = "Principal Investigator"
	attribute creator_email = "Kenneth.Casey@noaa.gov"
	attribute creator_institution = "US DOC; NOAA; National Environmental Satellite Data and Information Service; National Centers for Environmental Information"
	attribute creator_name = "Kenneth S. Casey"
	attribute creator_type = "person"
	attribute creator_url = "http://pathfinder.nodc.noaa.gov"
	attribute date_created = "20160513T100729Z"
	attribute date_issued = "20160301T000000Z"
	attribute date_metadata_modified = "20160125T000000Z"
	attribute date_modified = "20160513T100729Z"
	attribute day_or_night = "Day"
	attribute easternmost_longitude = 180.0
	attribute file_quality_level = 3
	attribute gds_version_id = "2.0"
	attribute geospatial_bounds = "-180.0000 -90.0000, 180.0000 90.0000"
	attribute geospatial_bounds_crs = "EPSG:4326"
	attribute geospatial_lat_max = 90.0
	attribute geospatial_lat_min = -90.0
	attribute geospatial_lat_resolution = 0.0416667014
	attribute geospatial_lat_units = "degrees north"
	attribute geospatial_lon_max = 180.0
	attribute geospatial_lon_min = -180.0
	attribute geospatial_lon_resolution = 0.0416667014
	attribute geospatial_lon_units = "degrees east"
	attribute history = "smigen_both ifile=2006121.b4kd3-pf53ap-n18-sst.hdf ofile=2006121.i4kd3-pf53ap-n18-sst.hdf prod=sst datamin=-3.0 datamax=40.0 precision=I projection=RECT resolution=4km gap_fill=2 ; /srv/disk1t/PFV5.3CONV/bin/Converter/hdf2nc_PFV53_L3C.x -v /srv/disk1t/PFV5.3CONV/Data_PFV53/PFV53_HDF_L3C/2006/2006121.i4kd3-pf53ap-n18-sst.hdf"
	attribute id = "AVHRR_Pathfinder-NCEI-L3C-v5.3"
	attribute institution = "NCEI"
	attribute instrument = "AVHRR-3"
	attribute instrument_vocabulary = "NASA Global Change Master Directory (GCMD) Science Keywords v8.4"
	attribute keywords = "Oceans > Ocean Temperature > Sea Surface Temperature"
	attribute keywords_vocabulary = "NASA/Global Change Master Directory (GCMD) Science Keywords v8.4"
	attribute license = "These data are available for use without restriction."
	attribute metadata_link = "http://data.nodc.noaa.gov/cgi-bin/iso?id=gov.noaa.nodc:AVHRR_Pathfinder-NCEI-L3C-v5.3"
	attribute naming_authority = "org.ghrsst"
	attribute ncei_template_version = "NCEI_NetCDF_Grid_Template_v2.0"
	attribute netcdf_version_id = "4.1.2"
	attribute northernmost_latitude = 90.0
	attribute orbit_node = "Ascending"
	attribute platform = "NOAA-18"
	attribute platform_vocabulary = "NASA Global Change Master Directory (GCMD) Science Keywords v8.4"
	attribute principal_year_day_for_collated_orbits = "2006121"
	attribute processing_level = "L3C"
	attribute product_version = "PFV5.3"
	attribute program = "NOAA Climate Data Record (CDR) Program for satellites"
	attribute project = "Group for High Resolution Sea Surface Temperature"
	attribute publisher_email = "ghrsst-po@nceo.ac.uk"
	attribute publisher_name = "GHRSST Project Office"
	attribute publisher_type = "group"
	attribute publisher_url = "http://www.ghrsst.org"
	attribute references = "http://pathfinder.nodc.noaa.gov 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."
	attribute sea_name = "World-Wide Distribution"
	attribute sensor = "AVHRR-3"
	attribute source = "AVHRR_GAC-CLASS-L1B-NOAA_18-v1"
	attribute southernmost_latitude = -90.0
	attribute spatial_resolution = "0.0416667 degree"
	attribute standard_name_vocabulary = "Climate and Forecast (CF) Standard Name Table (Version 29, 08 July 2015)"
	attribute start_time = "20060430T212220Z"
	attribute stop_time = "20060502T063308Z"
	attribute summary = "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 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 time_coverage_duration = "P1D"
	attribute time_coverage_end = "20060502T063308Z"
	attribute time_coverage_resolution = "P1D"
	attribute time_coverage_start = "20060430T212220Z"
	attribute title = "AVHRR Pathfinder Version 5.3 L3-Collated (L3C) sea surface temperature"
	attribute uuid = "84099687-3382-4D83-88F2-DA9835DBD28E"
	attribute westernmost_longitude = -180.0
dataset /aerosol_dynamic_indicator: int8, shape (1, 4320, 8640)
	attribute _FillValue = -128
	attribute add_offset = 1.1
	attribute comment = "Aerosol optical thickness (100 KM) data are taken from the CLASS AERO100 products, which are created from AVHRR channel 1 optical thickness retrievals from AVHRR global area coverage (GAC) data. The aerosol optical thickness measurements are interpolated from their original 1 degree x 1 degree resolution to the 4km Pathfinder Version 5.3 grid."
	attribute coverage_content_type = "auxiliaryInformation"
	attribute grid_mapping = "crs"
	attribute long_name = "aerosol dynamic indicator"
	attribute reference = "http://www.class.ncdc.noaa.gov/saa/products/search?datatype_family=AERO100"
	attribute scale_factor = 0.01
	attribute source = "CLASS_AERO100_AOT"
	attribute time_offset = 60.0
	attribute units = "percent"
	attribute valid_max = 127
	attribute valid_min = -127
dataset /crs: int32, shape ()
	attribute comment = "This is a container variable that describes the grid_mapping used by the data in this file. This variable does not contain any data; only information about the geographic coordinate system."
	attribute epsg_code = "EPSG:4326"
	attribute grid_mapping_name = "latitude_longitude"
	attribute inverse_flattening = 298.257223563
	attribute long_name = "coordinate reference system"
	attribute semi_major_axis = 6378137.0
dataset /dt_analysis: int8, shape (1, 4320, 8640)
	attribute _FillValue = -128
	attribute add_offset = 0.0
	attribute comment = "The difference between this SST and the previous day's SST."
	attribute coverage_content_type = "auxiliaryInformation"
	attribute grid_mapping = "crs"
	attribute long_name = "deviation from last SST analysis"
	attribute platform = "NOAA-18"
	attribute reference = "AVHRR_OI, with inland values populated from AVHRR_Pathfinder daily climatological SST. For more information on this reference field see http://accession.nodc.noaa.gov/0071180."
	attribute scale_factor = 0.1
	attribute source = "NOAA Daily 25km Global Optimally Interpolated Sea Surface Temperature (OISST)"
	attribute units = "kelvin"
	attribute valid_max = 127
	attribute valid_min = -127
dataset /l2p_flags: int16, shape (1, 4320, 8640)
	attribute add_offset = 0.0
	attribute comment = "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. Bits six (6) indicates the daytime unrealistic SST values (>39.8°C) that remain in pf_quality_level 4 to 7. Users are recommended to avoid these values."
	attribute coverage_content_type = "auxiliaryInformation"
	attribute flag_masks = 1, 2, 4, 8, 16, 32, 64, 128, 256
	attribute flag_meanings = "microwave land ice lake river reserved_for_future_use extreme_sst unused_currently unused_currently"
	attribute grid_mapping = "crs"
	attribute long_name = "L2P flags"
	attribute platform = "NOAA-18"
	attribute scale_factor = 1.0
	attribute source = "AVHRR_GAC-CLASS-L1B-NOAA_18-v1"
	attribute units = "1"
	attribute valid_max = 256
	attribute valid_min = 0
dataset /lat: float32, shape (4320)
	attribute axis = "Y"
	attribute long_name = "latitude"
	attribute reference_datum = "Geographical coordinates, WGS84 datum"
	attribute standard_name = "latitude"
	attribute units = "degrees_north"
	attribute valid_max = 90.0
	attribute valid_min = -90.0
// lat: first 89.9791718, last -89.9791641, count 4320
dataset /lat_bounds: float32, shape (4320, 2)
	attribute comment = "latitude values at the north and south bounds of each grid point"
	attribute long_name = "latitude bounds"
	attribute units = "degrees_north"
dataset /lon: float32, shape (8640)
	attribute axis = "X"
	attribute long_name = "longitude"
	attribute reference_datum = "Geographical coordinates, WGS84 datum"
	attribute standard_name = "longitude"
	attribute units = "degrees_east"
	attribute valid_max = 180.0
	attribute valid_min = -180.0
// lon: first -179.979172, last 179.979156, count 8640
dataset /lon_bounds: float32, shape (8640, 2)
	attribute comment = "longitude values at the west and east bounds of each grid point"
	attribute long_name = "longitude bounds"
	attribute units = "degrees_east"
dataset /nv: float32, shape (2)
dataset /pathfinder_quality_level: int8, shape (1, 4320, 8640)
	attribute _FillValue = -1
	attribute add_offset = 0.0
	attribute comment = "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 coverage_content_type = "qualityInformation"
	attribute flag_meanings = "bad_data worst_quality low_quality low_quality acceptable_quality acceptable_quality acceptable_quality best_quality"
	attribute flag_values = 0, 1, 2, 3, 4, 5, 6, 7
	attribute grid_mapping = "crs"
	attribute long_name = "Pathfinder SST quality flag"
	attribute platform = "NOAA-18"
	attribute scale_factor = 1.0
	attribute source = "AVHRR_GAC-CLASS-L1B-NOAA_18-v1"
	attribute units = "1"
	attribute valid_max = 7
	attribute valid_min = 0
dataset /quality_level: int8, shape (1, 4320, 8640)
	attribute _FillValue = 0
	attribute add_offset = 0.0
	attribute ancillary_variables = "pathfinder_quality_level"
	attribute comment = (text block)
| 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 coverage_content_type = "qualityInformation"
	attribute flag_meanings = "no_data bad_data worst_quality low_quality acceptable_quality best_quality"
	attribute flag_values = 0, 1, 2, 3, 4, 5
	attribute grid_mapping = "crs"
	attribute long_name = "quality level of SST pixel"
	attribute platform = "NOAA-18"
	attribute scale_factor = 1.0
	attribute source = "AVHRR_GAC-CLASS-L1B-NOAA_18-v1"
	attribute units = "1"
	attribute valid_max = 5
	attribute valid_min = 1
dataset /sea_ice_fraction: int8, shape (1, 4320, 8640)
	attribute _FillValue = -128
	attribute add_offset = 0.0
	attribute comment = "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 (http://accession.nodc.noaa.gov/0068294) 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 coverage_content_type = "auxiliaryInformation"
	attribute grid_mapping = "crs"
	attribute long_name = "sea ice fraction"
	attribute reference = "Reynolds, et al.(2006) Daily High-resolution Blended Analyses. Available at http://doi.org/10.7289/V5SQ8XB5"
	attribute scale_factor = 0.01
	attribute source = "Satellite Application Facility on Ocean and Sea Ice, European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT OSI SAF): ice_conc_nh_polstere-100_reproc_200605011200.nc, ice_conc_sh_polstere-100_reproc_200605011200.nc"
	attribute standard_name = "sea_ice_area_fraction"
	attribute time_offset = 1.0
	attribute units = "percent"
	attribute valid_max = 127
	attribute valid_min = -127
dataset /sea_surface_temperature: int16, shape (1, 4320, 8640)
	attribute _FillValue = -32768
	attribute add_offset = 273.15
	attribute ancillary_variables = "quality_level pathfinder_quality_level l2p_flags"
	attribute comment = "Skin temperature of the ocean"
	attribute coverage_content_type = "physicalMeasurement"
	attribute grid_mapping = "crs"
	attribute long_name = "NOAA Climate Data Record of sea surface skin temperature"
	attribute platform = "NOAA-18"
	attribute scale_factor = 0.01
	attribute source = "AVHRR_GAC-CLASS-L1B-NOAA_18-v1"
	attribute standard_name = "sea_surface_skin_temperature"
	attribute units = "kelvin"
	attribute valid_max = 4500
	attribute valid_min = -180
dataset /sses_bias: int8, shape (1, 4320, 8640)
	attribute _FillValue = -128
	attribute add_offset = 0.0
	attribute comment = "Bias estimate derived using the techniques described at https://www.ghrsst.org/ghrsst/tags-and-wgs/stval-wg/sses-description-of-schemes/. Note: in PFV5.3 this sses_bias is empty. PFV6 will contain the correct sses_bias values."
	attribute coverage_content_type = "auxiliaryInformation"
	attribute grid_mapping = "crs"
	attribute long_name = "SSES bias estimate"
	attribute platform = "NOAA-18"
	attribute scale_factor = 0.02
	attribute source = "AVHRR_GAC-CLASS-L1B-NOAA_18-v1"
	attribute units = "kelvin"
	attribute valid_max = 127
	attribute valid_min = -127
dataset /sses_standard_deviation: int8, shape (1, 4320, 8640)
	attribute _FillValue = -128
	attribute add_offset = 2.54
	attribute comment = "Standard deviation estimate derived using the techniques described at https://www.ghrsst.org/ghrsst/tags-and-wgs/stval-wg/sses-description-of-schemes/. Note: in PFV5.3 this sses_standard_deviation is empty. PFV6 will contain the correct sses_standard_deviation values."
	attribute coverage_content_type = "auxiliaryInformation"
	attribute grid_mapping = "crs"
	attribute long_name = "SSES standard deviation"
	attribute platform = "NOAA-18"
	attribute scale_factor = 0.02
	attribute source = "AVHRR_GAC-CLASS-L1B-NOAA_18-v1"
	attribute units = "kelvin"
	attribute valid_max = 127
	attribute valid_min = -127
dataset /sst_dtime: int32, shape (1, 4320, 8640)
	attribute _FillValue = -2147483648
	attribute add_offset = 0
	attribute comment = "Time plus sst_dtime gives seconds after 1981-01-01 00:00:00. Note: in PFV5.3 this sst_dtime is empty. PFV6 will contain the correct sst_dtime values."
	attribute coverage_content_type = "auxiliaryInformation"
	attribute grid_mapping = "crs"
	attribute long_name = "time difference from reference time"
	attribute platform = "NOAA-18"
	attribute scale_factor = 1
	attribute source = "AVHRR_GAC-CLASS-L1B-NOAA_18-v1"
	attribute units = "seconds"
	attribute valid_max = 2147483647
	attribute valid_min = -2147483647
dataset /time: int32, shape (1)
	attribute axis = "T"
	attribute calendar = "gregorian"
	attribute comment = "This is the reference time of the SST file. Add sst_dtime to this value to get pixel-by-pixel times."
	attribute long_name = "reference time of SST file"
	attribute standard_name = "time"
	attribute units = "seconds since 1981-01-01 00:00:00"
dataset /time_bounds: int32, shape (1, 2)
	attribute calendar = "gregorian"
	attribute comment = "time bounds for each time value"
	attribute long_name = "time bounds"
	attribute units = "seconds since 1981-01-01 00:00:00"
dataset /wind_speed: int8, shape (1, 4320, 8640)
	attribute _FillValue = -128
	attribute add_offset = 0.0
	attribute comment = "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 coverage_content_type = "auxiliaryInformation"
	attribute grid_mapping = "crs"
	attribute height = "10 m"
	attribute long_name = "10m wind speed"
	attribute scale_factor = 1.0
	attribute source = "NCEP/DOE AMIP-II Reanalysis (Reanalysis-2): u_wind.10m.gauss.2006.nc, v_wind.10m.gauss.2006.nc"
	attribute standard_name = "wind_speed"
	attribute time_offset = 1.5744000000000007
	attribute units = "m s-1"
	attribute valid_max = 127
	attribute valid_min = -127