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Dataset Title:  ESA OC CCI - Chlorophyll a concentration, Kd 490, v3.1 - Monthly, Kd490, 1997-
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Institution:  Plymouth Marine Laboratory   (Dataset ID: pmlEsaOCCCI31KD490Monthly)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Make a graph
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (UTC) ?      250    30 days 10h 7m 14s (uneven)
  < slider >
 latitude (degrees_north) ?      4320    -0.04166666 (even)
  < slider >
 longitude (degrees_east) ?      8640    0.04166667 (even)
  < slider >
Grid Variables (which always also download all of the dimension variables)
 chlor_a (milligram m-3) ?
 kd_490 (m-1) ?

File type: (more info)

(Documentation / Bypass this form) ?
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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 8.733312e+8, 1.5278112e+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";
    Float32 actual_range -89.97916, 89.97916;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 89.979164;
    Float32 valid_min -89.979164;
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -179.9792, 179.9792;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max 179.97917;
    Float32 valid_min -179.97917;
  chlor_a {
    Float32 _FillValue 9.96921e+36;
    String ancillary_variables "chlor_a_log10_rmsd chlor_a_log10_bias";
    Float64 colorBarMaximum 30.0;
    Float64 colorBarMinimum 0.03;
    String colorBarScale "Log";
    String grid_mapping "crs";
    String ioos_category "Ocean Color";
    String long_name "Chlorophyll-a concentration in seawater (not log-transformed), generated by SeaDAS using a blended combination of OCI (OC4v6 + Hu's CI), OC3 and OC5, depending on water class memberships";
    String parameter_vocab_uri "";
    String standard_name "mass_concentration_of_chlorophyll_a_in_sea_water";
    String units "milligram m-3";
    String units_nonstandard "mg m^-3";
  kd_490 {
    Float32 _FillValue 9.96921e+36;
    String ancillary_variables "kd_490_rmsd kd_490_bias";
    Float64 colorBarMaximum 0.2;
    Float64 colorBarMinimum 0.0;
    String grid_mapping "crs";
    String ioos_category "Heat Flux";
    String long_name "Downwelling attenuation coefficient at 490nm, derived using Lee 2005 equation and bbw from Zhang 2009 (following the SeaDAS Kd_lee algorithm)";
    String parameter_vocab_uri "";
    String standard_name "volume_attenuation_coefficient_of_downwelling_radiative_flux_in_sea_water";
    String units "m-1";
    String units_nonstandard "m^-1";
    String cdm_data_type "Grid";
    String comment "See summary attribute";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creation_date "Fri Aug 31 09:45:40 2018";
    String creator_email "";
    String creator_name "Plymouth Marine Laboratory";
    String creator_url "";
    String date_created "Fri Aug 31 09:45:40 2018";
    Float64 Easternmost_Easting 179.9792;
    Float64 geospatial_lat_max 89.97916;
    Float64 geospatial_lat_min -89.97916;
    Float64 geospatial_lat_resolution 0.0416666635795323;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.9792;
    Float64 geospatial_lon_min -179.9792;
    Float64 geospatial_lon_resolution 0.041666674383609215;
    String geospatial_lon_units "degrees_east";
    String history 
"Source data were:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,; netcdf_compositor_cci composites  Rrs_412, Rrs_443, Rrs_490, Rrs_510, Rrs_555, Rrs_670, water_class1, water_class2, water_class3, water_class4, water_class5, water_class6, water_class7, water_class8, water_class9, water_class10, water_class11, water_class12, water_class13, water_class14, atot_412, atot_443, atot_490, atot_510, atot_555, atot_670, aph_412, aph_443, aph_490, aph_510, aph_555, aph_670, adg_412, adg_443, adg_490, adg_510, adg_555, adg_670, bbp_412, bbp_443, bbp_490, bbp_510, bbp_555, bbp_670, chlor_a, kd_490, Rrs_412_bias, Rrs_443_bias, Rrs_490_bias, Rrs_510_bias, Rrs_555_bias, Rrs_670_bias, chlor_a_log10_bias, aph_412_bias, aph_443_bias, aph_490_bias, aph_510_bias, aph_555_bias, aph_670_bias, adg_412_bias, adg_443_bias, adg_490_bias, adg_510_bias, adg_555_bias, adg_670_bias, kd_490_bias with --mean,  Rrs_412_rmsd, Rrs_443_rmsd, Rrs_490_rmsd, Rrs_510_rmsd, Rrs_555_rmsd, Rrs_670_rmsd, chlor_a_log10_rmsd, aph_412_rmsd, aph_443_rmsd, aph_490_rmsd, aph_510_rmsd, aph_555_rmsd, aph_670_rmsd, adg_412_rmsd, adg_443_rmsd, adg_490_rmsd, adg_510_rmsd, adg_555_rmsd, adg_670_rmsd, kd_490_rmsd with --root-mean-square, and  MODISA_nobs, VIIRS_nobs, MERIS_nobs, SeaWiFS_nobs, total_nobs - with --total
    String id "";
    String infoUrl "";
    String institution "Plymouth Marine Laboratory";
    String keywords "490nm, absorption, adg_412, adg_412_bias, adg_412_rmsd, adg_443, adg_443_bias, adg_443_rmsd, adg_490, adg_490_bias, adg_490_rmsd, adg_510, adg_510_bias, adg_510_rmsd, adg_555, adg_555_bias, adg_555_rmsd, adg_670, adg_670_bias, adg_670_rmsd, air, algorithm, all, all-v3.1-monthly, aph_412, aph_412_bias, aph_412_rmsd, aph_443, aph_443_bias, aph_443_rmsd, aph_490, aph_490_bias, aph_490_rmsd, aph_510, aph_510_bias, aph_510_rmsd, aph_555, aph_555_bias, aph_555_rmsd, aph_670, aph_670_bias, aph_670_rmsd, aqua, area, array, array-data, atmosphere, atmospheric, atot_412, atot_443, atot_490, atot_510, atot_555, atot_670, attenuation, backscattering, backwards, bbp_412, bbp_443, bbp_490, bbp_510, bbp_555, bbp_670, bbw, bias, bin, blended, cci, cell, chemistry, chlor_a, chlor_a_log10_bias, chlor_a_log10_rmsd, chlorophyll, chlorophyll-a, class, coefficient, color, colour, combination, compositing, comprehensive, concentration, concentration_of_chlorophyll_in_sea_water, contributing, count, coverage, data, defined, depending, derived, detrital, difference, dissolved, downwelling, earth, Earth Science > Atmosphere > Atmospheric Radiation > Radiative Flux, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, Earth Science > Oceans > Ocean Optics > Absorption, Earth Science > Oceans > Ocean Optics > Attenuation/Transmission, Earth Science > Oceans > Ocean Optics > Radiance, emerging, equation, esa, field, field-of-view, flux, following, gac, generated, global, heat, heat flux, imager, imager/radiometer, imaging, infrared, irradiance, kd_490, kd_490_bias, kd_490_rmsd, laboratory, lac, large, latitude, leaving, lee, local, log, log-transformed, log10, log10-transformed, longitude, marine, mass, mass_concentration_of_chlorophyll_a_in_sea_water, material, mean, membership, memberships, meris, MERIS_nobs_sum, model, moderate, modis, MODISA_nobs_sum, month, monthly, normalised, not, number, observation, observations, oc3, oc4v6, oc5, ocean, ocean color, ocean colour, oceans, oci, optical, optical properties, optics, over, particulate, period, phytoplankton, phytoplankton species, plymouth, product, properties, qaa, quality, radiance, radiation, radiative, radiometer, ratio, reflectance, resolution, root, root-mean-square-difference, Rrs_412, Rrs_412_bias, Rrs_412_rmsd, Rrs_443, Rrs_443_bias, Rrs_443_rmsd, Rrs_490, Rrs_490_bias, Rrs_490_rmsd, Rrs_510, Rrs_510_bias, Rrs_510_rmsd, Rrs_555, Rrs_555_bias, Rrs_555_rmsd, Rrs_670, Rrs_670_bias, Rrs_670_rmsd, satellite, scattering, science, sea, sea-wide, seadas, seawater, seawifs, SeaWiFS_nobs_sum, sensor, species, spectroradiometer, square, statistics, stewardship, suite, surface, surface_ratio_of_upwelling_radiance_emerging_from_sea_water_to_downwelling_radiative_flux_in_air, system, time, total, total_nobs_sum, transformed, transmission, upwelling, using, v3.1, view, viirs, VIIRS_nobs_sum, visible, volume, volume_absorption_coefficient_of_radiative_flux_in_sea_water, volume_attenuation_coefficient_of_downwelling_radiative_flux_in_sea_water, volume_backwards_scattering_coefficient_of_radiative_flux_in_sea_water, water, water-leaving, water_class1, water_class10, water_class11, water_class12, water_class13, water_class14, water_class2, water_class3, water_class4, water_class5, water_class6, water_class7, water_class8, water_class9, wide, zhang";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "ESA CCI Data Policy: free and open access.  When referencing, please use: Ocean Colour Climate Change Initiative dataset, Version <Version Number>, European Space Agency, available online at  We would also appreciate being notified of publications so that we can list them on the project website at";
    String naming_authority "";
    Float64 Northernmost_Northing 89.97916;
    Int32 number_of_files_composited 31;
    String number_of_optical_water_types "14";
    String platform "Orbview-2,Aqua,Envisat,Suomi-NPP";
    String processing_level "Level-3";
    String product_version "3.1";
    String project "Climate Change Initiative - European Space Agency";
    String references "";
    String sensor "SeaWiFS,MODIS,MERIS,VIIRS";
    String sensors_present "MODISA VIIRSN";
    String source "NASA SeaWiFS L2 R2014.0 LAC and GAC, MODIS-Aqua L1A, MERIS L1B 3rd reprocessing inc OCL corrections, NASA VIIRS L2 R2014.0.1 (data identical to R2014.0.2)";
    String sourceUrl "";
    Float64 Southernmost_Northing -89.97916;
    String spatial_resolution "4km nominal at equator";
    String standard_name_vocabulary "CF Standard Name Table v29";
    String summary "Data products generated by the Ocean Colour component of the European Space Agency Climate Change Initiative project. These files are monthly composites of merged sensor (MERIS, Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua, Sea-Wide Field-of-View Sensor (SeaWiFS) Local Area Coverage (LAC) & Global Area Coverage (GAC), Visible and Infrared Imager/Radiometer Suite (VIIRS)) products.  MODIS Aqua and MERIS were band-shifted and bias-corrected to SeaWiFS bands and values using a temporally and spatially varying scheme based on the overlap years of 2003-2007.  VIIRS was band-shifted and bias-corrected in a second stage against the MODIS Rrs that had already been corrected to SeaWiFS levels, for the overlap period 2012-2013.  VIIRS and SeaWiFS Rrs were derived from standard NASA L2 products; MERIS and MODIS from a combination of NASA's l2gen (for basic sensor geometry corrections, etc) and HYGEOS Polymer v3.5 (for atmospheric correction).  The Rrs were binned to a sinusoidal 4km level-3 grid, and later to 4km geographic projection, by Brockmann Consult's BEAM.  Derived products were generally computed with the standard SeaDAS algorithms.  QAA IOPs were derived using the standard SeaDAS algorithm but with a modified backscattering table to match that used in the bandshifting.  The final chlorophyll is a combination of OC4, Hu's CI and OC5, depending on the water class memberships.  Uncertainty estimates were added using the fuzzy water classifier and uncertainty estimation algorithm of Tim Moore as documented in Jackson et al (2017). More info:";
    String time_coverage_duration "P1M";
    String time_coverage_end "2018-06-01T00:00:00Z";
    String time_coverage_resolution "P1M";
    String time_coverage_start "1997-09-04T00:00:00Z";
    String title "ESA OC CCI - Chlorophyll a concentration, Kd 490, v3.1 - Monthly, Kd490, 1997-2017";
    String tracking_id "ae0feb9b-c15d-47d7-bfce-2882141818b3";
    Float64 Westernmost_Easting -179.9792;


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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{?query}
For example,[(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]).

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