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Dataset Title:  Chlorophyll a Concentration, Aqua MODIS - 8-day, 2002-present. v.2018.0 Subscribe RSS
Institution:  NASA/GSFC OBPG   (Dataset ID: aqua_chla_8d_2018_0)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Make a graph
 
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (Centered Time, UTC) ?      912    7 days 22h 45m 42s (uneven)
  < slider >
 latitude (degrees_north) ?      4320    -0.04166667 (even)
  < slider >
 longitude (degrees_east) ?      8640    0.04166667 (even)
  < slider >
 
Grid Variables (which always also download all of the dimension variables)
 chlor_a (Chlorophyll Concentration, OCI Algorithm, mg m-3) ?

File type: (more info)

(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 1.025784e+9, 1.6514064e+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 _FillValue NaN;
    Float32 actual_range -89.97917, 89.97916;
    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 {
    Int32 _ChunkSizes 8640;
    String _CoordinateAxisType "Lon";
    Float32 _FillValue NaN;
    Float32 actual_range 0.0208387, 359.9792;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max 360.0;
    Float32 valid_min 0.0;
  }
  chlor_a {
    Float32 _FillValue NaN;
    Float64 colorBarMaximum 30.0;
    Float64 colorBarMinimum 0.03;
    String colorBarScale "Log";
    String ioos_category "Ocean Color";
    String long_name "Chlorophyll Concentration, OCI Algorithm";
    String references "Hu, C., Lee Z., and Franz, B.A. (2012). Chlorophyll-a algorithms for oligotrophic oceans: A novel approach based on three-band reflectance difference, J. Geophys. Res., 117, C01011, doi:10.1029/2011JC007395.";
    String standard_name "mass_concentration_of_chlorophyll_in_sea_water";
    String units "mg m-3";
    Float32 valid_max 100.0;
    Float32 valid_min 0.001;
  }
  NC_GLOBAL {
    String _lastModified "2022-05-25T02:25:31.000Z";
    String _NCProperties "version=2,netcdf=4.7.3,hdf5=1.12.0,";
    String cdm_data_type "Grid";
    String Conventions "CF-1.6 ACDD-1.3, COARDS";
    String creator_email "data@oceancolor.gsfc.nasa.gov";
    String creator_name "NASA/GSFC/OBPG";
    String creator_type "group";
    String creator_url "https://oceandata.sci.gsfc.nasa.gov";
    String date_created "2019-02-13T02:50:25Z";
    Float64 Easternmost_Easting 359.9792;
    Float64 geospatial_lat_max 89.97916;
    Float64 geospatial_lat_min -89.97917;
    Float64 geospatial_lat_resolution 0.04166666589488307;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 359.9792;
    Float64 geospatial_lon_min 0.0208387;
    Float64 geospatial_lon_resolution 0.041666669903924064;
    String geospatial_lon_units "degrees_east";
    String history 
"Wed May 25 07:10:28 2022: ncatted -O -a sw_point_longitude,global,o,f,0.02083333 A20221212022128.L3m_8D_CHL_chlor_a_4km-0-360.nc
Wed May 25 07:10:28 2022: ncatted -O -a geospatial_lon_min,global,o,f,0.0 A20221212022128.L3m_8D_CHL_chlor_a_4km-0-360.nc
Wed May 25 07:10:28 2022: ncatted -O -a geospatial_lon_max,global,o,f,360.0 A20221212022128.L3m_8D_CHL_chlor_a_4km-0-360.nc
Wed May 25 07:10:28 2022: ncatted -O -a easternmost_longitude,global,o,f,360.0 A20221212022128.L3m_8D_CHL_chlor_a_4km-0-360.nc
Wed May 25 07:10:28 2022: ncatted -O -a westernmost_longitude,global,o,f,0.0 A20221212022128.L3m_8D_CHL_chlor_a_4km-0-360.nc
Wed May 25 07:10:28 2022: ncatted -O -a valid_max,lon,o,f,360.0 A20221212022128.L3m_8D_CHL_chlor_a_4km-0-360.nc
Wed May 25 07:10:28 2022: ncatted -O -a valid_min,lon,o,f,0.0 A20221212022128.L3m_8D_CHL_chlor_a_4km-0-360.nc
Wed May 25 07:10:25 2022: ncap2 -O -s where(lon<0) lon=lon+360 A20221212022128.L3m_8D_CHL_chlor_a_4km-0-360.nc A20221212022128.L3m_8D_CHL_chlor_a_4km-0-360.nc
Wed May 25 07:10:23 2022: ncks -O --msa_usr_rdr -d lon,0.0,180.0 -d lon,-180.0,0.0 A20221212022128.L3m_8D_CHL_chlor_a_4km.nc A20221212022128.L3m_8D_CHL_chlor_a_4km-0-360.nc
l3mapgen par=A20221212022128.L3m_8D_CHL_chlor_a_4km.nc.param 
2023-03-31T03:02:21Z (local files)
2023-03-31T03:02:21Z https://oceanwatch.pifsc.noaa.gov/erddap/griddap/aqua_chla_8d_2018_0.das";
    String id "A20221212022128.L3b_8D_CHL.nc/L3/A20221212022128.L3b_8D_CHL.nc";
    String identifier_product_doi "10.5067/AQUA/MODIS/L3M/CHL/2018";
    String identifier_product_doi_authority "https://dx.doi.org";
    String infoUrl "https://oceandata.sci.gsfc.nasa.gov";
    String institution "NASA/GSFC OBPG";
    String instrument "MODIS";
    String keywords "algorithm, aqua, biology, center, chemistry, chlor_a, chlorophyll, chlorophyllr, color, concentration, data, earth, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, Earth Science > Oceans > Ocean Chemistry > Chlorophyllr, Earth Science > Oceans > Ocean Chemistry > Pigments > Chlorophyll, flight, goddard, group, gsfc, image, imaging, L3, level, level-3, mapped, mass, mass_concentration_of_chlorophyll_in_sea_water, moderate, modis, modisa, nasa, obpg, ocean, ocean color, oceans, oci, palette, pigments, processing, resolution, science, sea, seawater, smi, space, spectroradiometer, standard, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String l2_flag_names "ATMFAIL,LAND,HILT,HISATZEN,STRAYLIGHT,CLDICE,COCCOLITH,LOWLW,CHLWARN,CHLFAIL,NAVWARN,MAXAERITER,ATMWARN,HISOLZEN,NAVFAIL,FILTER,HIGLINT";
    String license "https://science.nasa.gov/earth-science/earth-science-data/data-information-policy/";
    String map_projection "Equidistant Cylindrical";
    String measure "Mean";
    String naming_authority "gov.nasa.gsfc.sci.oceandata";
    String NCO "netCDF Operators version 4.7.5 (Homepage = http://nco.sf.net, Code = https://github.com/nco/nco)";
    Int32 nco_openmp_thread_number 1;
    Float64 Northernmost_Northing 89.97916;
    String platform "Aqua";
    String processing_level "L3 Mapped";
    String processing_version "2018.1QL";
    String product_name "A20221212022128.L3m_8D_CHL_chlor_a_4km.nc";
    String project "Ocean Biology Processing Group (NASA/GSFC/OBPG)";
    String publisher_email "data@oceancolor.gsfc.nasa.gov";
    String publisher_name "NASA/GSFC/OBPG";
    String publisher_type "group";
    String publisher_url "https://oceandata.sci.gsfc.nasa.gov";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.97917;
    String spatialResolution "4.64 km";
    String standard_name_vocabulary "CF Standard Name Table v36";
    String summary "Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua - 8-day Ocean Color. Chlorophyll-a Concentration. 2002 - present. spatial resolution = 4.64km";
    String temporal_range "8-day";
    String time_coverage_end "2022-05-01T12:00:00Z";
    String time_coverage_start "2002-07-04T12:00:00Z";
    String title "Chlorophyll a Concentration, Aqua MODIS - 8-day, 2002-present. v.2018.0";
    Float64 Westernmost_Easting 0.0208387;
  }
}

 

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.

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[(2015-06-09T09:00:00Z)][(-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.


 
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