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| Dataset Title: | NOAA-20 Ocean color and sst calculation by Ocean Color Biology Group; Regridded to Mercator lon/lat projection. Processed at the University of Delaware     | 
| Institution: | University of Delaware (Dataset ID: noaa20_8day_nwatl) | 
| Information: | Summary  | License  | FGDC
     | ISO 19115
     | Metadata
     | Background  | Make a graph | 
Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.688255999e+9, 1.735689599e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Time";
    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";
    Float64 actual_range 16.007999420166016, 52.0;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -100.0, -50.0099983215332;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  sst {
    Float32 _FillValue -999.0;
    Float64 colorBarMaximum 32.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Temperature";
    String long_name "Sea Surface Temperature";
    String standard_name "sea_surface_temperature";
    String units "degree_C";
  }
  a_411 {
    Float32 _FillValue -999.0;
    String ioos_category "Unknown";
    String long_name "Total absorption at 411 nm, GIOP model";
    String units "m^-1";
  }
  a_445 {
    Float32 _FillValue -999.0;
    String ioos_category "Unknown";
    String long_name "Total absorption at 445 nm, GIOP model";
    String units "m^-1";
  }
  a_489 {
    Float32 _FillValue -999.0;
    String ioos_category "Unknown";
    String long_name "Total absorption at 489 nm, GIOP model";
    String units "m^-1";
  }
  a_556 {
    Float32 _FillValue -999.0;
    String ioos_category "Unknown";
    String long_name "Total absorption at 556 nm, GIOP model";
    String units "m^-1";
  }
  a_667 {
    Float32 _FillValue -999.0;
    Float64 colorBarMaximum -25000.035;
    Float64 colorBarMinimum -25000.055;
    String ioos_category "Optical Properties";
    String long_name "Total absorption at 667 nm, GIOP model";
    String units "m^-1";
  }
  bb_556 {
    Float32 _FillValue -999.0;
    String ioos_category "Unknown";
    String long_name "Total backscattering at 556 nm, GIOP model";
    String units "m^-1";
  }
  aph_445 {
    Float32 _FillValue -999.0;
    String ioos_category "Phytoplankton Species";
    String long_name "Absorption due to phytoplankton at 445 nm, GIOP model";
    String units "m^-1";
  }
  adg_445 {
    Float32 _FillValue -999.0;
    String ioos_category "Unknown";
    String long_name "Absorption due to gelbstoff and detrital material at 445 nm, GIOP model";
    String units "m^-1";
  }
  chlor_a {
    Float32 _FillValue -999.0;
    Float64 colorBarMaximum 30.0;
    Float64 colorBarMinimum 0.03;
    String colorBarScale "Log";
    String ioos_category "Ocean Color";
    String long_name "Chlorophyll Concentration, OCI Algorithm";
    String standard_name "concentration_of_chlorophyll_in_sea_water";
    String units "mg m^-3";
  }
  Rrs_411 {
    Float32 _FillValue -999.0;
    String ioos_category "Optical Properties";
    String long_name "Remote sensing reflectance at 411 nm";
    String units "sr^-1";
  }
  Rrs_445 {
    Float32 _FillValue -999.0;
    String ioos_category "Optical Properties";
    String long_name "Remote sensing reflectance at 445 nm";
    String units "sr^-1";
  }
  Rrs_489 {
    Float32 _FillValue -999.0;
    String ioos_category "Optical Properties";
    String long_name "Remote sensing reflectance at 489 nm";
    String units "sr^-1";
  }
  Rrs_556 {
    Float32 _FillValue -999.0;
    String ioos_category "Optical Properties";
    String long_name "Remote sensing reflectance at 556 nm";
    String units "sr^-1";
  }
  Rrs_667 {
    Float32 _FillValue -999.0;
    Float64 colorBarMaximum -25000.035;
    Float64 colorBarMinimum -25000.055;
    String ioos_category "Optical Properties";
    String long_name "Remote sensing reflectance at 667 nm";
    String units "sr^-1";
  }
  pic {
    Float32 _FillValue -999.0;
    String ioos_category "Ocean Color";
    String long_name "Calcite Concentration, Balch and Gordon";
    String units "mol m^-3";
  }
  poc {
    Float32 _FillValue -999.0;
    String ioos_category "Ocean Color";
    String long_name "Particulate Organic Carbon, D. Stramski, 2007 (443/555 version)";
    String units "mg m^-3";
  }
  Kd_490 {
    Float32 _FillValue -999.0;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum -10.0;
    String ioos_category "Optical Properties";
    String long_name "Diffuse attenuation coefficient at 490 nm, KD2 algorithm";
    String units "m^-1";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String Conventions "COARDS, CF-1.10, ACDD-1.3";
    Float64 Easternmost_Easting -50.0099983215332;
    Float64 geospatial_lat_max 52.0;
    Float64 geospatial_lat_min 16.007999420166016;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -50.0099983215332;
    Float64 geospatial_lon_min -100.0;
    String geospatial_lon_units "degrees_east";
    String history 
"2025-10-31T06:50:48Z (local files)
2025-10-31T06:50:48Z http://basin.ceoe.udel.edu/erddap/griddap/noaa20_8day_nwatl.das";
    String infoUrl "https://sites.udel.edu/ceoe-moliver/";
    String institution "University of Delaware";
    String keywords "443/555, a_411, a_445, a_489, a_556, a_667, absorption, adg_445, algorithm, aph_445, attenuation, backscattering, balch, bb_556, calcite, carbon, chemistry, chlor_a, chlorophyll, coefficient, color, concentration, concentration_of_chlorophyll_in_sea_water, data, detrital, diffuse, due, earth, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, Earth Science > Oceans > Ocean Temperature > Sea Surface Temperature, gelbstoff, giop, gordon, kd2, Kd_490, local, material, model, ocean, ocean color, oceans, oci, optical, optical properties, organic, particulate, phytoplankton, phytoplankton species, pic, poc, properties, reflectance, remote, Rrs_411, Rrs_445, Rrs_489, Rrs_556, Rrs_667, science, sea, sea_surface_temperature, seawater, sensing, source, species, sst, stramski, surface, temperature, time, total, version, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String license 
"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.";
    Float64 Northernmost_Northing 52.0;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 16.007999420166016;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "NOAA-20 Ocean color and sst calculation by Ocean Color Biology Group; Regridded to Mercator lon/lat projection. Processed at the University of Delaware";
    String time_coverage_end "2024-12-31T23:59:59Z";
    String time_coverage_start "2023-07-01T23:59:59Z";
    String title "NOAA-20 Ocean color and sst calculation by Ocean Color Biology Group; Regridded to Mercator lon/lat projection. Processed at the University of Delaware";
    Float64 Westernmost_Easting -100.0;
  }
}
 Data Access Protocol (DAP)
    Data Access Protocol (DAP) and its
    projection constraints
 and its
    projection constraints .
.
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.