Data Access Form

Dataset Title:	X-Experimental-Particulate Inorganic Carbon, VIIRS NOAA-20, Science Quality, Western Arctic Seas, 4km, 2019-present (1 Day Composite)
Institution:	NOAA PFEG (Dataset ID: poc_arctic_viirs_noaa20)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Files \| Make a graph

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Dimensions	Size	Spacing
time (Centered Time, UTC)	214	23h 59m 43s (uneven)

latitude (degrees_north)	321	-0.0375 (even)

longitude (degrees_east)	1201	0.03750008 (even)

Grid Variables (which always also download all of the dimension variables)

poc (Particulate Organic Carbon, D. Stramski, 2024, mg m-3)

Rrs_489 (Remote Sensing Reflectance at 489 nm, sr^-1)

Rrs_556 (Remote Sensing Reflectance at 556 nm, sr-1)

Rrs_667 (Remote Sensing Reflectance at 667 nm, sr-1)

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 1.6461648e+9, 1.6645644e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Centered 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";
    Float32 actual_range 63.99375, 75.99375;
    String axis "Y";
    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 -170.0063, -125.0062;
    String axis "X";
    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;
  }
  poc {
    Float32 _FillValue -999.0;
    Float32 colorBarMaximum 5000.0;
    Float32 colorBarMinimum 5.0;
    String colorBarScale "Log";
    String ioos_category "Other";
    String long_name "Particulate Organic Carbon, D. Stramski, 2024";
    String standard_name "mass_concentration_of_particulate_organic_carbon_in_sea_water";
    String units "mg m-3";
  }
  Rrs_489 {
    Float32 _FillValue -999.0;
    Float32 colorBarMaximum 0.04;
    Float32 colorBarMinimum 4.0e-5;
    String colorBarScale "Log";
    String ioos_category "Ocean Color";
    String long_name "Remote Sensing Reflectance at 489 nm";
    String solar_irradiance_units "mW cm-2 um-1";
    String standard_name "surface_ratio_of_upwelling_radiance_emerging_from_sea_water_to_downwelling_radiative_flux_in_air";
    String units "sr^-1";
  }
  Rrs_556 {
    Float32 _FillValue -999.0;
    Float32 colorBarMaximum 0.04;
    Float32 colorBarMinimum 4.0e-5;
    String colorBarScale "Log";
    String ioos_category "Ocean Color";
    String long_name "Remote Sensing Reflectance at 556 nm";
    String solar_irradiance_units "mW cm-2 um-1";
    String standard_name "surface_ratio_of_upwelling_radiance_emerging_from_sea_water_to_downwelling_radiative_flux_in_air";
    String units "sr-1";
  }
  Rrs_667 {
    Float32 _FillValue -999.0;
    Float32 colorBarMaximum 0.04;
    Float32 colorBarMinimum 4.0e-5;
    String colorBarScale "Log";
    String ioos_category "Ocean Color";
    String long_name "Remote Sensing Reflectance at 667 nm";
    String solar_irradiance_units "mW cm-2 um-1";
    String standard_name "surface_ratio_of_upwelling_radiance_emerging_from_sea_water_to_downwelling_radiative_flux_in_air";
    String units "sr-1";
  }
  NC_GLOBAL {
    String _lastModified "2024-05-30T01:39:38.000Z";
    String cdm_data_type "Grid";
    String Conventions "CF-1.6 ACDD-1.3, COARDS";
    String creator_email "coastwatch.info at noaa.gov";
    String creator_name "NOAA CoastWatch West Coast";
    String creator_type "group";
    String creator_url "https://coastwatch.pfeg.noaa.gov";
    Float64 Easternmost_Easting -125.0062;
    Float64 geospatial_lat_max 75.99375;
    Float64 geospatial_lat_min 63.99375;
    Float64 geospatial_lat_resolution 0.03750000000000002;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -125.0062;
    Float64 geospatial_lon_min -170.0063;
    Float64 geospatial_lon_resolution 0.03750008333333334;
    String geospatial_lon_units "degrees_east";
    String history 
"Files containing Rrs data were downloaded daily from NOAA CoastWatch or NASA Ocean Data DAC and gridded to the NASA SMI 4km grid.
2024-09-07T13:37:53Z (local files)
2024-09-07T13:37:53Z https://polarwatch.noaa.gov/erddap/griddap/poc_arctic_viirs_noaa20.das";
    String id "poc_arctic_viirs_noaa20";
    String infoUrl "https://coastwatch.pfeg.noaa.gov";
    String institution "NOAA PFEG";
    String instrument "VIIRS";
    String keywords "2019-present, 4km, air, alaska, arctic, atmosphere, atmospheric, carbon, coefficients, color, color ocean, color/ocean, composite, concentration, daily, data, day, downwelling, earth, Earth Science > Atmosphere > Atmospheric Radiation > Radiative Flux, Earth Science > Oceans > Ocean Optics > Ocean Color/Ocean Turbidity/Water-Leaving Radiance/Extinction Coefficients, Earth Science > Oceans > Ocean Optics > Radiance, emerging, environmental, extinction, fisheries, flux, group, imager, imager/radiometer, imaging, information, infrared, inorganic, latitude, leaving, longitude, mass, mass_concentration_of_particulate_organic_carbon_in_sea_water, national, nesdis, nmfs, noaa, noaa-20, ocean, ocean color, oceans, optical, optical properties, optics, orbiting, organic, pacific, particulate, pfeg, poc, polar-orbiting, present, properties, quality, radiance, radiance/extinction, radiation, radiative, radiometer, ratio, reflectance, remote, Rrs_489, Rrs_556, Rrs_667, satellite, science, science quality, sea, seas, seawater, sensing, service, snpp, star, stramski, suite, surface, surface_ratio_of_upwelling_radiance_emerging_from_sea_water_to_downwelling_radiative_flux_in_air, time, turbidity, turbidity/water-leaving, upwelling, viir, viirs, visible, water, western";
    String keywords_vocabulary "GCMD Science Keywords";
    String l2_flag_names "ATMFAIL,LAND,HISATZEN,STRAYLIGHT,CLDICE,LOWLW,NAVWARN,ATMWARN,HISOLZEN,NAVFAIL,FILTER,HIGLINT";
    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.";
    String naming_authority "erddap/gov.noaa.pfeg.coastwatch";
    Float64 Northernmost_Northing 75.99375;
    String platform "NOAA-20";
    String processing_level "L3 Mapped";
    String product_name "poc_arctic_viirs_noaa20";
    String project "POC algorithm Moses Stramski 2024";
    String publisher_email "coastwatch.info at noaa.gov";
    String publisher_name "NOAA/NMFS/SWFSC/ITDS/ERD";
    String publisher_type "group";
    String publisher_url "https://coastwatch.noaa.gov";
    String references "D.Stramski et al. (2023) Adaptive optical algorithms with differentiation of water bodies based on varying composition of suspended particulate matter: A case study for estimating the particulate organic carbon concentration in the western Arctic seas. Remote Sensing of Environment 286: 113360. https://doi.org/10.1016/j.rse.2022.113360";
    String satellite "NOAA-20";
    String sensor "VIIRS";
    String source "satellite observations from VIIRS NOAA-20";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 63.99375;
    String spatialResolution "4.638312 km";
    String standard_name_vocabulary "CF Standard Name Table v36";
    String summary "Satellite POC field for the Chukchi and western Beaufort Seas using the adaptive algorithm of Stramski et al. (2023)";
    String temporal_range "day";
    String testOutOfDate "now-15days";
    String time_coverage_end "2022-09-30T19:00:00Z";
    String time_coverage_start "2022-03-01T20:00:00Z";
    String title "X-Experimental-Particulate Inorganic Carbon, VIIRS NOAA-20, Science Quality, Western Arctic Seas, 4km, 2019-present (1 Day Composite)";
    Float64 Westernmost_Easting -170.0063;
  }
}

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.

(easy) You can get data by using the dataset's Data Access Form. It makes the URL for you.
(easy) You can make a graph or map by using the dataset's Make A Graph form. It makes the URL for you.
(not hard) You can bypass the forms and get the data or make a graph or map by generating the URL by hand or with a computer program or script.

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.