Data Access Form

Dataset Title:	Chlorophyll (Gap-filled DINEOF), NOAA S-NPP NOAA-20, VIIRS, Science Quality, Global 9km, 2018-recent, Daily
Institution:	NOAA NESDIS CoastWatch (Dataset ID: nesdisVHNnoaaSNPPnoaa20chlaGapfilledDaily)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Files \| Make a graph

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Dimensions	Size	Spacing
time (UTC)	1911	1 day 0h 30m 9s (uneven)

altitude (m)	1	(just one value)

latitude (degrees_north)	2160	-0.08333334 (even)

longitude (degrees_east)	4320	0.08333332 (even)

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

chlor_a (Chlorophyll Concentration, DINEOF Gap-Filled, 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 1.5276816e+9, 1.6961616e+9;
    String axis "T";
    String calendar "gregorian";
    String ioos_category "Time";
    String long_name "Time";
    String source_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 ioos_category "Location";
    String long_name "Altitude";
    String positive "up";
    String standard_name "altitude";
    String units "m";
  }
  latitude {
    UInt32 _ChunkSizes 2160;
    String _CoordinateAxisType "Lat";
    Float32 actual_range -89.95834, 89.95834;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String source_name "lat";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 90.0;
    Float32 valid_min -90.0;
  }
  longitude {
    UInt32 _ChunkSizes 4320;
    String _CoordinateAxisType "Lon";
    Float32 actual_range -179.9583, 179.9583;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String source_name "lon";
    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(interval:1 day)";
    Float64 colorBarMaximum 30.0;
    Float64 colorBarMinimum 0.03;
    String colorBarScale "Log";
    String coverage_content_type "physicalMeasurement";
    String grid_mapping "coord_ref";
    String ioos_category "Ocean Color";
    String long_name "Chlorophyll Concentration, DINEOF Gap-Filled";
    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 "2023-10-12T21:15:08.000Z";
    String _NCProperties "version=2,netcdf=4.7.3,hdf5=1.12.0,";
    String cdm_data_type "Grid";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "coastwatch.info@noaa.gov";
    String creator_name "NOAA CoastWatch";
    String creator_type "group";
    String creator_url "https://coastwatch.noaa.gov/";
    Float64 data_bins 4717608;
    Float32 data_maximum 250.97945;
    Float32 data_minimum 4.3695874e-4;
    String date_created "2023-10-12T21:15:08.000Z";
    Float64 Easternmost_Easting 179.9583;
    Float32 easternmost_longitude 180.0;
    Int32 end_orbit_number 0;
    Float64 geospatial_lat_max 89.95834;
    Float64 geospatial_lat_min -89.95834;
    Float64 geospatial_lat_resolution 0.08333333950903196;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.9583;
    Float64 geospatial_lon_min -179.9583;
    Float64 geospatial_lon_resolution 0.0833333178976615;
    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 history 
"/data/data369/hgu/ocssw/bin/l3mapgen par=/data/data652/coastwatch/oc/L3/scripts/bin/../config/l3mapgen_par_dineof_chlor_a ifile=/data/data652/coastwatch/oc/L3/scripts/bin/../temp/Config_dineof/V2023274_oci_L3.nc ofile=/data/data369/viirs/L3_dineof/274/V2023274_A1_WW00_chlor_a.nc   Thu Oct 12 21:15:11 2023
: /data/data652/coastwatch/oc/L3/scripts/bin/l3cnvtr -b -s Suomi-NPP,NOAA-20 /data/data369/viirs/L3_dineof/274/V2023274_A1_WW00_chlor_a.nc /data/aftp/socd1/mecb/coastwatch/viirs/science/L3/global/chlora/dineof/2023/V2023274_A1_WW00_chlora.nc
2024-11-21T15:51:15Z (local files)
2024-11-21T15:51:15Z https://coastwatch.pfeg.noaa.gov/erddap/griddap/nesdisVHNnoaaSNPPnoaa20chlaGapfilledDaily.das";
    String id "L3//data/data540/DINEOF/EOF-global-daily4/reconstructed_mix_nsw/V2023274_oci_L3.nc";
    String infoUrl "https://coastwatch.noaa.gov/";
    String institution "NOAA NESDIS CoastWatch";
    String instrument "VIIRS";
    String keywords "altitude, applications, baseline, center, chlorophyll, data, environmental, graphics, imager, imager/radiometer, imaging, information, infrared, latitude, leaving, longitude, mean, merged, n20, national, nesdis, noaa, NOAA-20, normalized, npp, optical, optical properties, orbiting, overlay, partnership, planes, polar, polar-orbiting, properties, radiance, radiometer, research, satellite, service, suite, time, viirs, visible, water, water-leaving, ww00";
    String l2_flag_names "ATMFAIL,LAND,HIGLINT,HILT,HISATZEN,CLOUD,HISOLZEN,LOWLW,CHLFAIL,NAVWARN,CLDSHDSTL,MAXAERITER,CHLWARN,ALGICE,SEAICE,NAVFAIL,FILTER";
    Float32 latitude_step 0.083333336;
    String latitude_units "degrees_north";
    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.";
    Float32 longitude_step 0.083333336;
    String longitude_units "degrees_east";
    String map_projection "geographic";
    String measure "Mean";
    String naming_authority "gov.noaa.coastwatch";
    Float32 northernmost_latitude 90.0;
    Float64 Northernmost_Northing 89.95834;
    Int32 number_of_columns 4320;
    Int32 number_of_lines 2160;
    String platform "Suomi-NPP, NOAA-20";
    String processing_level "L3 Mapped";
    String processing_version "Unspecified";
    String product_name "V2023274_A1_WW00_chlora.nc";
    String proj4_string "+proj=eqc +lat_ts=0 +lat_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs +lon_0=0.000000";
    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_url "https://coastwatch.noaa.gov;https://www.ncei.noaa.gov/";
    String Satellite 
"Suomi-NPP
 NOAA-20";
    String Sensor "VIIRS";
    String sourceUrl "(local files)";
    Float32 southernmost_latitude -90.0;
    Float64 Southernmost_Northing -89.95834;
    String spatialResolution "9.28 km";
    String standard_name_vocabulary "CF Standard Name Table v29";
    Int32 start_orbit_number 0;
    String suggested_image_scaling_applied "No";
    Float32 suggested_image_scaling_maximum 20.0;
    Float32 suggested_image_scaling_minimum 0.01;
    String suggested_image_scaling_type "LOG";
    String summary "Visible and Infrared Imager/Radiometer Suite/Suomi-NPP NOAA-20 (VIIRS) Level-3 (WW00), Chlorophyll, DINEOF, Gap filled, MSL12,  Science Quality,Global, Daily, processed by NOAA.  EXPERIMENTAL.";
    Float32 sw_point_latitude -89.958336;
    Float32 sw_point_longitude -179.95833;
    String temporal_range "daily";
    String testOutOfDate "now-4days";
    String time_coverage_end "2023-10-01T12:00:00Z";
    String time_coverage_start "2018-05-30T12:00:00Z";
    String title "Chlorophyll (Gap-filled DINEOF), NOAA S-NPP NOAA-20, VIIRS, Science Quality, Global 9km, 2018-recent,  Daily";
    Float64 Westernmost_Easting -179.9583;
    Float32 westernmost_longitude -180.0;
  }
}

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.