Data Access Form

Dataset Title:	Chlorophyll (Gap-filled DINEOF), NOAA S-NPP NOAA-20 VIIRS and Copernicus S-3A OLCI, Science Quality, Global 2km, 2018-recent, Daily
Institution:	NOAA NESDIS STAR (Dataset ID: noaacwNPPN20S3ASCIDINEOF2kmDaily)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Files \| Make a graph

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Dimensions	Size	Spacing
time (UTC)	2450	1 day 0h 34m 6s (uneven)

altitude (m)	1	(just one value)

latitude (degrees_north)	8640	-0.02083333 (uneven)

longitude (degrees_east)	17280	0.02083334 (uneven)

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

chlor_a (Chlorophyll Concentration, Default Algorithm, mg m^-3)

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 1.514808e+9, 1.7314128e+9;
    String axis "T";
    String calendar "gregorian";
    String coverage_content_type "coordinate";
    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";
  }
  altitude {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "up";
    Float64 actual_range 0.0, 0.0;
    String axis "Z";
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "Altitude";
    String positive "up";
    String standard_name "altitude";
    String units "m";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range -89.98959, 89.98959;
    String axis "Y";
    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 -179.9896, 179.9896;
    String axis "X";
    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;
  }
  chlor_a {
    Float32 _FillValue -999.0;
    String C_format "%.4g";
    String cell_methods "time:mean";
    Float64 colorBarMaximum 30.0;
    Float64 colorBarMinimum 0.03;
    String colorBarScale "Log";
    String coverage_content_type "physicalMeasurement";
    String ioos_category "Ocean Color";
    String long_name "Chlorophyll Concentration, Default Algorithm";
    String references "O\\'Reilly J. E. et al. (1998), Ocean color chlorophyll algorithms for SeaWiFS, J. Geophys. Res., 103(C11), 2493724953";
    String standard_name "mass_concentration_of_chlorophyll_a_in_sea_water";
    String units "mg m^-3";
    Float32 valid_max 100.0;
    Float32 valid_min 0.001;
  }
  NC_GLOBAL {
    String _lastModified "2024-11-23T01:05:20.000Z";
    String acknowledgement "To cite these data in a paper, please include NOAA NESDIS Ocean Color Science Team and the NOAA CoastWatch program, the date that you downloaded the data, the title in the metadata, and the publisher (see the 'publisher_name' in the metadata). If possible, please include the specific URL(s) used to download the data.";
    String cdm_data_type "Grid";
    String Conventions "CF-1.10, COARDS, ACDD-1.3";
    String creator_email "coastwatch.info@noaa.gov";
    String creator_name "NOAA CoastWatch";
    String creator_type "institution";
    String creator_url "https://coastwatch.noaa.gov";
    String date_created "2024-11-23T01:05:20.000Z";
    Float64 Easternmost_Easting 179.9896;
    Float64 geospatial_lat_max 89.98959;
    Float64 geospatial_lat_min -89.98959;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.9896;
    Float64 geospatial_lon_min -179.9896;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 0.0;
    Float64 geospatial_vertical_min 0.0;
    String geospatial_vertical_positive "up";
    String geospatial_vertical_units "m";
    String grid_mapping_epsg_code "EPSG:4326";
    Float32 grid_mapping_inverse_flattening 298.2572;
    Float32 grid_mapping_longitude_of_prime_meridian 0.0;
    String grid_mapping_name "latitude_longitude";
    String grid_mapping_proj4_params "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs";
    Float32 grid_mapping_semi_major_axis 6378137.0;
    String history 
"/data/data369/hgu/v224/bin/l3mapgen par=/data/data369/hgu/v224/config/l3mapgen_par_dineof2km_chlor_a ifile=/data/data369/hgu/v224/bin/../temp/Config_dineof2km_chlor_a/V2024317_oci_L3.nc ofile=/data/data369/viirs/L3_dineof/317/V2024317_A1_WW00_chlor_a_2km.nc   Sat Nov 23 01:05:38 2024
: /data/data369/hgu/v224/bin/l3cnvtr /data/data369/viirs/L3_dineof/317/V2024317_A1_WW00_chlor_a_2km.nc /data/dmz/pub0040/coastwatch/viirs/science/L3/global/chlora/dineof2km/2024/V2024317_A1_WW00_chlora_2km.nc
2024-11-23T08:00:23Z (local files)
2024-11-23T08:00:23Z https://coastwatch.pfeg.noaa.gov/erddap/griddap/noaacwNPPN20S3ASCIDINEOF2kmDaily.das";
    String id "V2024317_A1_WW00_chlora_2km.nc";
    String identifier_product_doi "https://doi.org/10.1109/tgrs.2023.3271465";
    String identifier_product_doi_authority "https://dx.doi.org";
    String infoUrl "https://coastwatch.noaa.gov";
    String institution "NOAA NESDIS STAR";
    String instrument "VIIRS,OLCI";
    String keywords "algorithm, altitude, chemistry, chlor_a, chlorophyll, color, concentration, data, default, earth, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, Earth Science > Oceans > Ocean Optics > Ocean Color, environmental, image, imager, imager/radiometer, imaging, information, infrared, L3, level, level-3, mapped, mass, mass_concentration_of_chlorophyll_a_in_sea_water, national, nesdis, noaa, npp, ocean, ocean color, oceans, optics, orbiting, partnership, polar, polar-orbiting, radiometer, satellite, science, sea, seawater, service, smi, standard, star, suite, suite/suomi-npp, suomi, time, viirs, viirs-n, viirsn, visible, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String l2_flag_names "ATMFAIL,LAND,HIGLINT,HILT,HISATZEN,CLOUD,HISOLZEN,LOWLW,CHLFAIL,NAVWARN,CLDSHDSTL,MAXAERITER,CHLWARN,ALGICE,SEAICE,NAVFAIL,FILTER";
    String license "These data were produced by NOAA and are not subject to copyright protection in the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0-1.0)";
    String map_projection "geographic";
    String measure "Mean";
    String naming_authority "gov.noaa.coastwatch";
    Float64 Northernmost_Northing 89.98959;
    String platform "Suomi-NPP, NOAA-20, Sentinel-3A";
    String processing_level "L3 Mapped";
    String product_name "V2024317_A1_WW00_chlora_2km.nc";
    String project "Ocean Color Science Team (NOAA/NESDIS/STAR/OCST)";
    String publisher_email "coastwatch.info@noaa.gov;ncei.info@noaa.gov";
    String publisher_name "NOAA CoastWatch;National Centers for Environmental Information (NCEI)";
    String publisher_type "group";
    String publisher_url "https://coastwatch.noaa.gov;https://www.ncei.noaa.gov/";
    String Satellite "Suomi-NPP, NOAA-20, Sentinel-3A";
    String Sensor "VIIRS,OLCI";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.98959;
    String spatialResolution "2.32 km";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Visible and Infrared Imager/Radiometer Suite/Suomi-NPP and NOAA-20 (VIIRS) and Sentinel-3A OLCI DINEOF gap filled L4 data. NOAA National Environmental Satellite, Data, and Information Service (NESDIS) STAR data. Sentinel-3A courtesy of Copernicus Program";
    String temporal_range "daily";
    String testOutOfDate "now-23days";
    String time_coverage_end "2024-11-12T12:00:00Z";
    String time_coverage_start "2018-01-01T12:00:00Z";
    String title "Chlorophyll (Gap-filled DINEOF), NOAA S-NPP NOAA-20 VIIRS and Copernicus S-3A OLCI, Science Quality, Global 2km, 2018-recent, Daily";
    Float64 Westernmost_Easting -179.9896;
  }
}

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.