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Dataset Title:  Sea-Surface Temperature, NOAA ACSPO Daily Global 0.02° Gridded Super-collated
SST and Thermal Fronts Reanalysis, 2012-present, Daily (L3S-LEO degrees C)
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Institution:  NOAA/NESDIS/STAR   (Dataset ID: noaacwLEOACSPOSSTL3SCDaily)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Make a graph
 
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (UTC) ?      3896    1 day 0h 10m 43s (uneven)
  < slider >
 latitude (degrees_north) ?      9000    -0.02 (even)
  < slider >
 longitude (degrees_east) ?      18000    0.02 (even)
  < slider >
 
Grid Variables (which always also download all of the dimension variables) 
 sea_surface_temperature (degree_C) ?
 sses_bias (SSES bias estimate, degree_C) ?
 sses_standard_deviation (degree_C) ?
 l2p_flags ?
 l3s_flags ?
 sst_count (Count of input L3U SST pixels) ?
 quality_level (quality level of SST pixel) ?
 sst_source (Source of major (highest weight) contribution to sst) ?
 satellite_zenith_angle (degrees) ?
 dt_analysis (deviation from SST reference, kelvin) ?
 sea_ice_fraction (1) ?
 wind_speed (m s-1) ?
 sst_dtime (time difference from reference time, seconds) ?
 measurement_dtime (seconds) ?
 sst_gradient_magnitude (kelvin/km) ?
 sst_front_position (Binary SST front position indicator) ?

File type: (more information)

(Documentation / Bypass this form) ?
 
(Please be patient. It may take a while to get the data.)


 

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.3280976e+9, 1.6671312e+9;
    String axis "T";
    String calendar "Gregorian";
    String comment "seconds since 1981-01-01 00:00:00";
    String coverage_content_type "coordinate";
    String ioos_category "Time";
    String long_name "reference time of sst file";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range -89.99, 89.99;
    String axis "Y";
    String comment "Latitudes for locating data";
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 90.0;
    Float32 valid_min -90.0;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -179.99, 179.99;
    String axis "X";
    String comment "Longitude for locating data";
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max 180.0;
    Float32 valid_min -180.0;
  }
  sea_surface_temperature {
    Float32 _FillValue -327.68;
    Float64 colorBarMaximum 35.0;
    Float64 colorBarMinimum 0.0;
    String comment "SST obtained by regression with buoy measurements, sensitive to skin SST. Further information at (Petrenko et al., JGR, 2014; doi:10.1002/2013JD020637)";
    String coverage_content_type "physicalMeasurement";
    String ioos_category "Temperature";
    String long_name "sea surface sub-skin temperature";
    String source "NOAA";
    String standard_name "sea_surface_subskin_temperature";
    String units "degree_C";
    Float32 valid_max 40.0;
    Float32 valid_min -2.0;
  }
  sses_bias {
    Float32 _FillValue -275.198;
    Float64 colorBarMaximum 5.0;
    Float64 colorBarMinimum 0.0;
    String comment "Bias is derived against Piecewise Regression SST produced by local regressions with buoys. Subtracting sses_bias from sea_surface_temperature produces more accurate estimate of SST at the depth of buoys. Further information at (Petrenko et al., JTECH, 2016; doi:10.1175/JTECH-D-15-0166.1)";
    String coverage_content_type "qualityInformation";
    String ioos_category "Statistics";
    String long_name "SSES bias estimate";
    String units "degree_C";
    Float32 valid_max -271.118;
    Float32 valid_min -275.182;
  }
  sses_standard_deviation {
    Float32 _FillValue -274.43;
    Float64 colorBarMaximum 5.0;
    Float64 colorBarMinimum 0.0;
    String comment "Standard deviation of sea_surface_temperature from SST measured by drifting buoys. Further information at (Petrenko et al., JTECH, 2016; doi:10.1175/JTECH-D-15-0166.1)";
    String coverage_content_type "qualityInformation";
    String ioos_category "Statistics";
    String long_name "SSES standard deviation";
    String units "degree_C";
    Float32 valid_max -271.88;
    Float32 valid_min -274.42;
  }
  l2p_flags {
    Int16 _FillValue 32767;
    Float64 colorBarMaximum 0.0;
    Float64 colorBarMinimum -30000.0;
    String comment "L2P common flags in bits 1-3 and data provider flags (from ACSPO mask) in bits 9-16. For backwards compatibility with legacy reader software, the data provider flags (last 8 bits) contain redundant land and ice information that is also available in bits 2 and 3, respectively. Description of individual bits:  bit01 (0=IR: 1=microwave); bit02 (0=not_land; 1=land (from land-sea mask)); bit03 (0=not_ice; 1=ice (from first-guess L4 SST)); bits04-08 (reserved,set to 0); bit09 (0=valid_radiance; 1=invalid_radiance); bit10 (0=nighttime; 1=daytime); bit11 (0=not_land; 1=land (identical to bit02)); bit12 (0=good quality data; 1=twilight_degradation (degraded quality data due to \"twilight\" region)); bit13 (0=not_sunglint; 1=sunglint); bit14 (0=not_ice; 1=ice (identical to bit03)); bit15 (0=sst; 1=SST_not_valid_or_degraded (not_valid or degraded SST w/QL<5)); bit16 (0=water (ocean, lake, river); 1=not_water (land, ice, invalid))";
    String coverage_content_type "qualityInformation";
    Int16 flag_masks 1, 2, 4, 256, 512, 1024, 2048, 4096, 8192, 16384, -32768;
    String flag_meanings "microwave land ice invalid_radiance daytime land twilight_degradation sunglint ice SST_not_valid_or_degraded not_water";
    String ioos_category "Quality";
    String long_name "L2P flags";
    Int16 valid_max 32767;
    Int16 valid_min -32768;
  }
  l3s_flags {
    Int16 _FillValue -32768;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "L3S-LEO data availability flags in bits 1-4 and bits 5-16 are reserved for future use. bit01 (0=L3S-LEO_PM_N unavailable: 1=L3S-LEO_PM_N available); bit02 (0=L3S-LEO_PM_D unavailable: 1=L3S-LEO_PM_D available); bit03 (0=L3S-LEO_AM_N unavailable: 1=L3S-LEO_AM_N available); bit04 (0=L3S-LEO_AM_D unavailable: 1=L3S-LEO_AM_D available)";
    String coverage_content_type "thematicClassification";
    Byte flag_masks 1, 2, 4, 8;
    String flag_meanings "LEO_PM_N LEO_PM_D LEO_AM_N LEO_AM_D";
    String ioos_category "Quality";
    String long_name "L3S flags";
    Int16 valid_max 32767;
    Int16 valid_min -32767;
  }
  sst_count {
    Byte _FillValue -128;
    String _Unsigned "false";
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String comment "Number of L3U pixels contributing to L3S pixel";
    String coverage_content_type "referenceInformation";
    String ioos_category "Statistics";
    String long_name "Count of input L3U SST pixels";
    Byte valid_max 127;
    Byte valid_min 0;
  }
  quality_level {
    Byte _FillValue -128;
    String _Unsigned "false";
    Float64 colorBarMaximum 6.0;
    Float64 colorBarMinimum 0.0;
    String comment "SST quality levels: 5 corresponds to “clear-sky” pixels and is recommended for operational applications and validation.";
    String coverage_content_type "qualityInformation";
    String flag_meanings "no_data bad_data not_used not_used not_used best_quality";
    Int16 flag_values 0, 1, 2, 3, 4, 5;
    String ioos_category "Quality";
    String long_name "quality level of SST pixel";
    Byte valid_max 5;
    Byte valid_min 0;
  }
  sst_source {
    Byte _FillValue -128;
    String _Unsigned "false";
    Float64 colorBarMaximum 4.0;
    Float64 colorBarMinimum 0.0;
    String comment "Major contributor to SST. The major contributor is defined as the L3S-LEO product with highest weighed l3s-daily observation.";
    String coverage_content_type "qualityInformation";
    String flag_meanings "LEO_PM_N LEO_PM_D LEO_AM_N LEO_AM_D";
    Byte flag_values 0, 1, 2, 3;
    String ioos_category "Temperature";
    String long_name "Source of major (highest weight) contribution to sst";
    Byte valid_max 3;
    Byte valid_min 0;
  }
  satellite_zenith_angle {
    Float32 _FillValue -327.68;
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String comment "Satellite zenith angle corresponding to L3S-LEO SST measurement with highest weight.";
    String coverage_content_type "referenceInformation";
    String height "10 m";
    String ioos_category "Unknown";
    String long_name "satellite zenith angle";
    String units "degrees";
    Float32 valid_max 327.67;
    Float32 valid_min -327.67;
  }
  dt_analysis {
    Float32 _FillValue -327.68;
    Float64 colorBarMaximum 5.0;
    Float64 colorBarMinimum -5.0;
    String comment "Deviation from reference SST, i.e., dt_analysis = SST - reference SST";
    String coverage_content_type "qualityInformation";
    String ioos_category "Statistics";
    String long_name "deviation from SST reference";
    String source "20221010120000-CMC-L4_GHRSST-SSTfnd-CMC0.1deg-GLOB-v02.0-fv03.0.nc";
    String units "kelvin";
    Float32 valid_max 327.67;
    Float32 valid_min -327.67;
  }
  sea_ice_fraction {
    Float32 _FillValue -1.28;
    Float64 colorBarMaximum 1.0;
    Float64 colorBarMinimum 0.0;
    String comment "Fractional sea ice cover";
    String coverage_content_type "qualityInformation";
    String ioos_category "Ice Distribution";
    String long_name "sea ice fraction";
    String source "20221010120000-CMC-L4_GHRSST-SSTfnd-CMC0.1deg-GLOB-v02.0-fv03.0.nc";
    String standard_name "sea_ice_area_fraction";
    String units "1";
    Float32 valid_max 1.0;
    Float32 valid_min 0.0;
  }
  wind_speed {
    Float32 _FillValue -0.15;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum 0.0;
    String comment "Typically represents surface winds (10 meters above the sea surface). The wind speeds reported here are a daily mean value.";
    String coverage_content_type "auxiliaryInformation";
    String height "10 m";
    String ioos_category "Wind";
    String long_name "wind speed";
    String source "MERRA2 tavg1_2d_ocn_Nx: 2d,1-Hourly,Time-Averaged,Single-Level,Assimilation,Ocean Surface Diagnostics";
    String standard_name "wind_speed";
    String units "m s-1";
    Float32 valid_max 38.1;
    Float32 valid_min 0.0;
  }
  sst_dtime {
    Float32 _FillValue -5.3687091e+8;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum -10.0;
    String comment "time plus sst_dtime gives seconds since 1981-01-01 00:00:00 UTC";
    String coverage_content_type "referenceInformation";
    String ioos_category "Temperature";
    String long_name "time difference from reference time";
    String units "seconds";
    Float32 valid_max 5.3687091e+8;
    Float32 valid_min -5.3687091e+8;
  }
  measurement_dtime {
    Float32 _FillValue -5.3687091e+8;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum -10.0;
    String comment "time plus measurement_dtime gives seconds since 1981-01-01 00:00:00 UTC";
    String coverage_content_type "referenceInformation";
    String ioos_category "Temperature";
    String long_name "time difference of highest weighted input SST from reference time. Is equal to sst_dtime for pixels where L3S-LEO-PM_N is available";
    String units "seconds";
    Float32 valid_max 5.3687091e+8;
    Float32 valid_min -5.3687091e+8;
  }
  sst_gradient_magnitude {
    Float32 _FillValue -32.768;
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum -40.0;
    String comment "Gradient magnitude calculated from SST field in all grids with valid SST";
    String coverage_content_type "physicalMeasurement";
    String ioos_category "Temperature";
    String long_name "SST gradient magnitude value";
    String units "kelvin/km";
    Float32 valid_max 32.767;
    Float32 valid_min -32.767;
  }
  sst_front_position {
    Byte _FillValue -128;
    String _Unsigned "false";
    Float64 colorBarMaximum 1.5;
    Float64 colorBarMinimum 0.0;
    String comment "Binary indicator of SST front position in the valid SST clear-sky domain: 1 - SST front present, 0 - no front present";
    String coverage_content_type "image";
    String ioos_category "Temperature";
    String long_name "Binary SST front position indicator";
    Byte valid_max 1;
    Byte valid_min 0;
  }
  NC_GLOBAL {
    String acknowledgement "Please acknowledge the use of these data with the following statement: These data were provided by Group for High Resolution Sea Surface Temperature (GHRSST) and the National Oceanic and Atmospheric Administration (NOAA).";
    String aggregator_version "V1.00";
    String cdm_data_type "Grid";
    Int32 col_count 18000;
    Int32 col_start 0;
    String collation_version "2.7.0";
    String comment "SSTs are a weighted average of the SSTs of contributing pixels. WARNING: some applications are unable to properly handle signed byte values. If byte values > 127 are encountered, subtract 256 from this reported value.";
    String Conventions "CF-1.7, ACDD-1.3, COARDS";
    String creator_email "Alex.Ignatov@noaa.gov";
    String creator_name "Alex Ignatov";
    String creator_type "person";
    String creator_url "http://www.star.nesdis.noaa.gov";
    String date_created "2022-09-03T06:02:56Z";
    String day_or_night "both";
    Float64 Easternmost_Easting 179.99;
    String gds_version_id "02.0";
    Float64 geospatial_lat_max 89.99;
    Float64 geospatial_lat_min -89.99;
    Float64 geospatial_lat_resolution 0.02;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.99;
    Float64 geospatial_lon_min -179.99;
    Float64 geospatial_lon_resolution 0.02;
    String geospatial_lon_units "degrees_east";
    String grid_mapping_horizontal_datum_name "World Geodetic System 1984";
    String grid_mapping_long_name "coordinate reference system";
    String grid_mapping_name "latitude_longitude";
    String grid_mapping_prime_meridian_name "Greenwich";
    String grid_mapping_reference_ellipsoid_name "WGS84";
    String history 
"Created by the L2-to-L3 conversion tool,  which was developed and provided by NOAA/NESDIS/STAR and CCNY. The version is 4.6.9
2022-11-30T05:34:53Z (local files)
2022-11-30T05:34:53Z http://coastwatch.pfeg.noaa.gov/erddap/griddap/noaacwLEOACSPOSSTL3SCDaily.das";
    String infoUrl "http://www.star.nesdis.noaa.gov";
    String institution "NOAA/NESDIS/STAR";
    String keywords "angle, area, atmosphere, atmospheric, available, bias, binary, contribution, count, cryosphere, data, deviation, difference, distribution, dt_analysis, dtime, earth, 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, equal, error, estimate, extent, flags, fraction, front, gradient, highest, ice, ice distribution, indicator, information, input, l2p, l2p_flags, l3s, l3s-leo-pm, l3s_flags, l3u, leo, level, magnitude, major, measurement_dtime, national, nesdis, noaa, ocean, oceans, office, pixel, pixels, position, produced, quality, quality_level, reference, retrievals, satellite, satellite_zenith_angle, science, sea, sea_ice_area_fraction, sea_ice_fraction, sea_surface_subskin_temperature, sea_surface_temperature, sensor, service, single, skin, source, speed, sses, sses_bias, sses_standard_deviation, sst, sst_count, sst_dtime, sst_front_position, sst_gradient_magnitude, sst_source, standard, star, statistics, sub, sub-skin, subskin, surface, temperature, time, value, weight, weighted, where, wind, wind_speed, winds, zenith";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "GHRSST protocol describes data use as free and open";
    String metadata_link "TBD";
    String naming_authority "org.ghrsst";
    Float64 Northernmost_Northing 89.99;
    String preprocessor_version "1.17.0";
    String processing_level "L3S";
    String product_version "L2 algorithm V2.80; L3 algorithm V4.6.9";
    String project "Group for High Resolution Sea Surface Temperature";
    String publisher_email "ghrsst-po@nceo.ac.uk";
    String publisher_name "The GHRSST Project Office";
    String publisher_type "group";
    String publisher_url "https://www.ghrsst.org";
    String references "Data convention: GHRSST Data Specification (GDS) v2.0. Algorithms: ACSPO-VIIRS ATBD (NOAA/NESDIS/STAR)";
    Int32 row_count 9000;
    Int32 row_start 0;
    String sensor "VIIRS,AVHRR";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.99;
    String spatial_resolution "0.02 deg";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Sea surface temperature retrievals produced by NOAA/NESDIS/STAR office";
    String testOutOfDate "now-95days";
    String time_coverage_end "2022-10-30T12:00:00Z";
    String time_coverage_start "2012-02-01T12:00:00Z";
    String title "Sea-Surface Temperature, NOAA ACSPO Daily Global 0.02° Gridded Super-collated SST and Thermal Fronts Reanalysis, 2012-present, Daily (L3S-LEO degrees C)";
    Float64 Westernmost_Easting -179.99;
  }
}

 

Using griddap to Request Data and Graphs from Gridded Datasets

griddap lets you request a data subset, graph, or map from a gridded dataset (for example, sea surface temperature data from a satellite), via a specially formed URL. griddap uses the OPeNDAP (external link) Data Access Protocol (DAP) (external link) and its projection constraints (external link).

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

griddap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/griddap/jplMURSST41.htmlTable?analysed_sst[(2002-06-01T09:00:00Z)][(-89.99):1000:(89.99)][(-179.99):1000:(180.0)]
Thus, the query is often a data variable name (e.g., analysed_sst), followed by [(start):stride:(stop)] (or a shorter variation of that) for each of the variable's dimensions (for example, [time][latitude][longitude]).

For details, see the griddap Documentation.


 
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