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ERDDAP > info > esa-cci-kd-8d-v6-0

Title Sum-
Institution Dataset ID
 data       graph  M    Kd490, ESA OC CCI - 8-Day, 1997-present. v6.0    ?   F   I   M   background (external link) RSS Subscribe
Plymouth Marine L...  ?

The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL cdm_data_type String Grid
attribute NC_GLOBAL comment String See summary attribute
attribute NC_GLOBAL Conventions String CF-1.7, COARDS, ACDD-1.3
attribute NC_GLOBAL creation_date String Thu Jan 18 08:48:44 2024
attribute NC_GLOBAL creator_email String help at
attribute NC_GLOBAL creator_name String Plymouth Marine Laboratory
attribute NC_GLOBAL creator_url String (external link)
attribute NC_GLOBAL date_created String 2022-08-17T01:51:17Z
attribute NC_GLOBAL Easternmost_Easting double 359.97916666666663
attribute NC_GLOBAL geospatial_lat_max double 89.97916666666667
attribute NC_GLOBAL geospatial_lat_min double -89.97916666666666
attribute NC_GLOBAL geospatial_lat_resolution double 0.041666666666666664
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double 359.97916666666663
attribute NC_GLOBAL geospatial_lon_min double 0.020833333333314386
attribute NC_GLOBAL geospatial_lon_resolution double 0.041666666666666664
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL git_commit_hash String 27964270df6ae0b9bdd0af5672529dbebb4e7bd9
attribute NC_GLOBAL history String Wed Apr 17 15:57:21 2024: ncatted -O -a geospatial_lon_max,global,o,f,360.0
Wed Apr 17 15:57:21 2024: ncatted -O -a geospatial_lon_min,global,o,f,0.0
Wed Apr 17 15:57:21 2024: ncatted -O -a valid_max,lon,o,f,359.9792
Wed Apr 17 15:57:21 2024: ncatted -O -a valid_min,lon,o,f,0.02083
Wed Apr 17 15:57:03 2024: ncap2 -O -s where(lon<0) lon=lon+360
Wed Apr 17 15:56:45 2024: ncks -O --msa_usr_rdr -d lon,0.0,180.0 -d lon,-180.0,0.0
Source data were:,,,,; netcdf_compositor_cci composites Rrs_412, Rrs_412_bias, Rrs_443, Rrs_443_bias, Rrs_490, Rrs_490_bias, Rrs_510, Rrs_510_bias, Rrs_560, Rrs_560_bias, Rrs_665, Rrs_665_bias, adg_412, adg_412_bias, adg_443, adg_443_bias, adg_490, adg_490_bias, adg_510, adg_510_bias, adg_560, adg_560_bias, adg_665, adg_665_bias, aph_412, aph_412_bias, aph_443, aph_443_bias, aph_490, aph_490_bias, aph_510, aph_510_bias, aph_560, aph_560_bias, aph_665, aph_665_bias, atot_412, atot_443, atot_490, atot_510, atot_560, atot_665, bbp_412, bbp_443, bbp_490, bbp_510, bbp_560, bbp_665, chlor_a, chlor_a_log10_bias, kd_490, kd_490_bias, 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 with --mean, Rrs_412_rmsd, Rrs_443_rmsd, Rrs_490_rmsd, Rrs_510_rmsd, Rrs_560_rmsd, Rrs_665_rmsd, adg_412_rmsd, adg_443_rmsd, adg_490_rmsd, adg_510_rmsd, adg_560_rmsd, adg_665_rmsd, aph_412_rmsd, aph_443_rmsd, aph_490_rmsd, aph_510_rmsd, aph_560_rmsd, aph_665_rmsd, chlor_a_log10_rmsd, kd_490_rmsd with --root-mean-square, and MERIS_nobs, MODISA_nobs, OLCI-A_nobs, OLCI-B_nobs, SeaWiFS_nobs, VIIRS_nobs, total_nobs - with --total
1705568930 Subsetted from standardised_geo/ to only include variables MERIS_nobs_sum,MODISA_nobs_sum,OLCI-A_nobs_sum,OLCI-B_nobs_sum,SeaWiFS_nobs_sum,VIIRS_nobs_sum,crs,kd_490,kd_490_bias,kd_490_rmsd,lat,lon,time,total_nobs_sum
attribute NC_GLOBAL id String
attribute NC_GLOBAL infoUrl String (external link)
attribute NC_GLOBAL institution String Plymouth Marine Laboratory
attribute NC_GLOBAL keywords String 490nm, algorithm, aqua, area, attenuation, bbw, bias, bin, cci, cell, coefficient, colour, contributing, count, coverage, data, derived, difference, downwelling, earth, Earth Science > Oceans > Ocean Optics > Attenuation/Transmission, Earth Science > Oceans > Ocean Optics > Radiance, equation, esa, field, field-of-view, flux, following, gac, global, imager, imager/radiometer, imaging, infrared, kd_490, kd_490_bias, kd_490_rmsd, laboratory, lac, lee, local, marine, mean, meris, MERIS_nobs_sum, moderate, modis, MODISA_nobs_sum, number, observation, observations, ocean, ocean colour, oceans, olci, OLCI-A_nobs_sum, OLCI-B_nobs_sum, optical, optical properties, optics, plymouth, product, properties, radiance, radiative, radiometer, resolution, root, root-mean-square-difference, satellite, science, sea, sea-wide, seadas, seawater, seawifs, SeaWiFS_nobs_sum, sensor, sentinel, sentinel-3a, sentinel-3b, spectroradiometer, square, statistics, suite, time, total, total_nobs_sum, transmission, using, view, viirs, VIIRS_nobs_sum, visible, volume, volume_attenuation_coefficient_of_downwelling_radiative_flux_in_sea_water, water, wide, zhang
attribute NC_GLOBAL keywords_vocabulary String GCMD Science Keywords
attribute NC_GLOBAL license String 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
attribute NC_GLOBAL naming_authority String
attribute NC_GLOBAL NCO String netCDF Operators version 4.7.5 (Homepage =, Code =
attribute NC_GLOBAL nco_openmp_thread_number int 1
attribute NC_GLOBAL netcdf_file_type String NETCDF4_CLASSIC
attribute NC_GLOBAL Northernmost_Northing double 89.97916666666667
attribute NC_GLOBAL number_of_bands_used_to_classify String 4
attribute NC_GLOBAL number_of_files_composited int 5
attribute NC_GLOBAL number_of_optical_water_types String 14
attribute NC_GLOBAL platform String Orbview-2,Aqua,Envisat,Suomi-NPP, Sentinel-3a, Sentinel-3b
attribute NC_GLOBAL processing_level String Level-3
attribute NC_GLOBAL product_version String 6.0
attribute NC_GLOBAL project String Climate Change Initiative - European Space Agency
attribute NC_GLOBAL references String (external link)
attribute NC_GLOBAL sensor String SeaWiFS,MODIS,MERIS,VIIRS,OLCI
attribute NC_GLOBAL sensors_present String OLCIa OLCIb
attribute NC_GLOBAL source String NASA SeaWiFS L1A and L2 R2018.0 LAC and GAC, MODIS-Aqua L1A and L2 R2018.0, MERIS L1B 3rd reprocessing inc OCL corrections, NASA VIIRS L1A and L2 R2018.0, OLCI L1B
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double -89.97916666666666
attribute NC_GLOBAL spatial_resolution String 4km nominal at equator
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v70
attribute NC_GLOBAL summary String Data products generated by the Ocean Colour component of the European Space Agency Climate Change Initiative project. These files are 8 day 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), OLCI) products. MODIS Aqua and SeaWiFS were band-shifted and bias-corrected to MERIS 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 MERIS levels, for the overlap period 2012-2014; at the third stage Sentinel-3A OLCI was bias corrected against already corrected MODIS, for overlap period 2016-07-01 to 2019-06-30; at the fourth stage Sentinel-3B OLCI was bias corrected against already corrected Sentinel-3A OLCI, for overlap period 2018-07-01 to 2021-06-30. VIIRS, MODIS, SeaWiFS and MERIS Rrs were derived from a combination of NASA's l2gen (for basic sensor geometry corrections, etc) and HYGEOS POLYMER (for atmospheric correction). OLCI Rrs were sourced at L1b (already geometrically corrected) and processed with POLYMER. The Rrs were binned to a sinusoidal 4km level-3 grid, and later to 4km geographic projection, by Brockmann Consult's SNAP. Derived products were generally computed with the standard algorithms through SeaDAS. 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 OCI, OCI2, OC2 and OCx, 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). and updated according to Jackson et al. (in prep).
attribute NC_GLOBAL time_coverage_duration String P8D
attribute NC_GLOBAL time_coverage_end String 2023-12-27T00:00:00Z
attribute NC_GLOBAL time_coverage_resolution String P8D
attribute NC_GLOBAL time_coverage_start String 1997-09-04T00:00:00Z
attribute NC_GLOBAL title String Kd490, ESA OC CCI - 8-Day, 1997-present. v6.0
attribute NC_GLOBAL tracking_id String e7c50009-314b-4eae-819b-afd161af16db
attribute NC_GLOBAL Westernmost_Easting double 0.020833333333314386
dimension time   double nValues=1211, evenlySpaced=false, averageSpacing=7 days 22h 36m 42s
attribute time _CoordinateAxisType String Time
attribute time actual_range double 8.733312E8, 1.7036352E9
attribute time axis String T
attribute time ioos_category String Time
attribute time long_name String Time
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time units String seconds since 1970-01-01T00:00:00Z
dimension latitude   double nValues=4320, evenlySpaced=true, averageSpacing=-0.041666666666666664
attribute latitude _CoordinateAxisType String Lat
attribute latitude actual_range double -89.97916666666666, 89.97916666666667
attribute latitude axis String Y
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
attribute latitude valid_max double 89.97916666666667
attribute latitude valid_min double -89.97916666666666
dimension longitude   double nValues=8640, evenlySpaced=true, averageSpacing=0.041666666666666664
attribute longitude _CoordinateAxisType String Lon
attribute longitude actual_range double 0.020833333333314386, 359.97916666666663
attribute longitude axis String X
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
attribute longitude valid_max double 359.97918701171875
attribute longitude valid_min double 0.020829999819397926
variable kd_490   float time, latitude, longitude
attribute kd_490 _FillValue float NaN
attribute kd_490 ancillary_variables String kd_490_rmsd kd_490_bias
attribute kd_490 colorBarMaximum double 5.0
attribute kd_490 colorBarMinimum double 0.01
attribute kd_490 colorBarScale String Log
attribute kd_490 ioos_category String Optical Properties
attribute kd_490 long_name String Downwelling attenuation coefficient at 490nm, derived using Lee 2005 equation and bbw from Zhang 2009 (following the SeaDAS Kd_lee algorithm)
attribute kd_490 parameter_vocab_uri String (external link)
attribute kd_490 standard_name String volume_attenuation_coefficient_of_downwelling_radiative_flux_in_sea_water
attribute kd_490 units String m-1
attribute kd_490 units_nonstandard String m^-1
attribute kd_490 wavelength int 490
variable MERIS_nobs_sum   float time, latitude, longitude
attribute MERIS_nobs_sum _FillValue float NaN
attribute MERIS_nobs_sum colorBarMaximum double 100.0
attribute MERIS_nobs_sum colorBarMinimum double 0.0
attribute MERIS_nobs_sum ioos_category String Statistics
attribute MERIS_nobs_sum long_name String Count of the number of observations from the MERIS sensor contributing to this bin cell
attribute MERIS_nobs_sum number_of_files_composited int 5
variable MODISA_nobs_sum   float time, latitude, longitude
attribute MODISA_nobs_sum _FillValue float NaN
attribute MODISA_nobs_sum colorBarMaximum double 100.0
attribute MODISA_nobs_sum colorBarMinimum double 0.0
attribute MODISA_nobs_sum ioos_category String Statistics
attribute MODISA_nobs_sum long_name String Count of the number of observations from the MODIS (Aqua) sensor contributing to this bin cell
attribute MODISA_nobs_sum number_of_files_composited int 5
variable OLCI_A_nobs_sum   float time, latitude, longitude
attribute OLCI_A_nobs_sum _FillValue float NaN
attribute OLCI_A_nobs_sum colorBarMaximum double 100.0
attribute OLCI_A_nobs_sum colorBarMinimum double 0.0
attribute OLCI_A_nobs_sum ioos_category String Statistics
attribute OLCI_A_nobs_sum long_name String Count of the number of observations from the OLCI (Sentinel-3a) sensor contributing to this bin cell
attribute OLCI_A_nobs_sum number_of_files_composited int 5
variable OLCI_B_nobs_sum   float time, latitude, longitude
attribute OLCI_B_nobs_sum _FillValue float NaN
attribute OLCI_B_nobs_sum colorBarMaximum double 100.0
attribute OLCI_B_nobs_sum colorBarMinimum double 0.0
attribute OLCI_B_nobs_sum ioos_category String Statistics
attribute OLCI_B_nobs_sum long_name String Count of the number of observations from the OLCI (Sentinel-3b) sensor contributing to this bin cell
attribute OLCI_B_nobs_sum number_of_files_composited int 5
variable SeaWiFS_nobs_sum   float time, latitude, longitude
attribute SeaWiFS_nobs_sum _FillValue float NaN
attribute SeaWiFS_nobs_sum colorBarMaximum double 100.0
attribute SeaWiFS_nobs_sum colorBarMinimum double 0.0
attribute SeaWiFS_nobs_sum ioos_category String Statistics
attribute SeaWiFS_nobs_sum long_name String Count of the number of observations from the SeaWiFS (GAC and LAC) sensor contributing to this bin cell
attribute SeaWiFS_nobs_sum number_of_files_composited int 5
variable VIIRS_nobs_sum   float time, latitude, longitude
attribute VIIRS_nobs_sum _FillValue float NaN
attribute VIIRS_nobs_sum colorBarMaximum double 100.0
attribute VIIRS_nobs_sum colorBarMinimum double 0.0
attribute VIIRS_nobs_sum ioos_category String Statistics
attribute VIIRS_nobs_sum long_name String Count of the number of observations from the VIIRS sensor contributing to this bin cell
attribute VIIRS_nobs_sum number_of_files_composited int 5
variable kd_490_bias   float time, latitude, longitude
attribute kd_490_bias _FillValue float NaN
attribute kd_490_bias colorBarMaximum double 0.1
attribute kd_490_bias colorBarMinimum double 0.0
attribute kd_490_bias comment String Uncertainty lookups derived from file: /data/datasets/CCI/v6.0-production/stage09b-uncertainty_tables/kd/cci_kd_bias.dat
attribute kd_490_bias ioos_category String Statistics
attribute kd_490_bias long_name String Bias of downwelling attenuation coefficient at 490 nm derived using Lee 2005 equation and bbw from Zhang 2009
attribute kd_490_bias references String (external link)
attribute kd_490_bias rel String uncertainty
attribute kd_490_bias units String m-1
attribute kd_490_bias units_nonstandard String m^-1
attribute kd_490_bias wavelength int 490
variable kd_490_rmsd   float time, latitude, longitude
attribute kd_490_rmsd _FillValue float NaN
attribute kd_490_rmsd colorBarMaximum double 0.1
attribute kd_490_rmsd colorBarMinimum double 0.0
attribute kd_490_rmsd comment String Uncertainty lookups derived from file: /data/datasets/CCI/v6.0-production/stage09b-uncertainty_tables/kd/cci_kd_rmsd.dat
attribute kd_490_rmsd ioos_category String Statistics
attribute kd_490_rmsd long_name String Root-mean-square-difference of downwelling attenuation coefficient at 490 nm derived using Lee 2005 equation and bbw from Zhang 2009
attribute kd_490_rmsd references String (external link)
attribute kd_490_rmsd rel String uncertainty
attribute kd_490_rmsd units String m-1
attribute kd_490_rmsd units_nonstandard String m^-1
attribute kd_490_rmsd wavelength int 490
variable total_nobs_sum   float time, latitude, longitude
attribute total_nobs_sum _FillValue float NaN
attribute total_nobs_sum colorBarMaximum double 100.0
attribute total_nobs_sum colorBarMinimum double 0.0
attribute total_nobs_sum ioos_category String Statistics
attribute total_nobs_sum long_name String Count of the total number of observations contributing to this bin cell
attribute total_nobs_sum number_of_files_composited int 5

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.

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