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Dataset Title:  Chlorophyll a Concentration, NPP VIIRS - CoastWatch - Daily, 2012-present Subscribe RSS
Institution:  STAR   (Dataset ID: noaa_snpp_chla_daily)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Make a graph
 
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (UTC) ?      4403    1 day 0h 6m 52s (uneven)
  < slider >
 altitude (m) ?      1    (just one value)
  < slider >
 latitude (degrees_north) ?      4788    -0.0375 (even)
  < slider >
 longitude (degrees_east) ?      9600    0.0375 (even)
  < slider >
 
Grid Variables (which always also download all of the dimension variables) 
 chlor_a (Diffuse attenuation coefficient at 490 nm, KD2 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 1.3255056e+9, 1.7076528e+9;
    String axis "T";
    String calendar "gregorian";
    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 ioos_category "Location";
    String long_name "Altitude";
    String positive "up";
    String standard_name "altitude";
    String units "m";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range -89.75625, 89.75625;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float64 valid_max 90.0;
    Float64 valid_min -90.0;
  }
  longitude {
    UInt32 _ChunkSizes 9600;
    String _CoordinateAxisType "Lon";
    Float64 actual_range 0.01875000000001137, 359.98125000000005;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float64 valid_max 360.0;
    Float64 valid_min 0.0;
  }
  chlor_a {
    Float32 _FillValue NaN;
    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 grid_mapping "coord_ref";
    String ioos_category "Ocean Color";
    String long_name "Diffuse attenuation coefficient at 490 nm, KD2 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 "2024-02-20T19:15:22.000Z";
    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 "institution";
    String creator_url "https://coastwatch.noaa.gov";
    String date_created "2019-03-11T15:22:04Z";
    Float64 Easternmost_Easting 359.98125000000005;
    Float64 geospatial_lat_max 89.75625;
    Float64 geospatial_lat_min -89.75625;
    Float64 geospatial_lat_resolution 0.0375;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 359.98125000000005;
    Float64 geospatial_lon_min 0.01875000000001137;
    Float64 geospatial_lon_resolution 0.037500000000000006;
    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_name "latitude_longitude";
    String history 
"Wed Feb 21 07:40:28 2024: ncatted -O -a sw_point_longitude,global,o,f,0.01875 V2024042_D1_WW00_chlora-0-360.nc
Wed Feb 21 07:40:28 2024: ncatted -O -a geospatial_lon_min,global,o,f,0.0 V2024042_D1_WW00_chlora-0-360.nc
Wed Feb 21 07:40:28 2024: ncatted -O -a geospatial_lon_max,global,o,f,360.0 V2024042_D1_WW00_chlora-0-360.nc
Wed Feb 21 07:40:28 2024: ncatted -O -a easternmost_longitude,global,o,f,360.0 V2024042_D1_WW00_chlora-0-360.nc
Wed Feb 21 07:40:28 2024: ncatted -O -a westernmost_longitude,global,o,f,0.0 V2024042_D1_WW00_chlora-0-360.nc
Wed Feb 21 07:40:28 2024: ncatted -O -a valid_max,lon,o,f,360.0 V2024042_D1_WW00_chlora-0-360.nc
Wed Feb 21 07:40:28 2024: ncatted -O -a valid_min,lon,o,f,0.0 V2024042_D1_WW00_chlora-0-360.nc
Wed Feb 21 07:40:26 2024: ncap2 -O -s where(lon<0) lon=lon+360 V2024042_D1_WW00_chlora-0-360.nc V2024042_D1_WW00_chlora-0-360.nc
Wed Feb 21 07:40:23 2024: ncks -O --msa_usr_rdr -d lon,0.0,180.0 -d lon,-180.0,0.0 V2024042_D1_WW00_chlora.nc V2024042_D1_WW00_chlora-0-360.nc
/data/data369/hgu/v224/bin/l3mapgen par=/data/data652/coastwatch/oc/L3/scripts/bin/../config/l3mapgen_par_chlor_a ifile=/data/data652/coastwatch/oc/L3/scripts/bin/../temp/Config_bmw/infile_2km_G.nc ofile=/data/data369/viirs/L3/2024/02/11/V2024042_D1_WW00_chlor_a.nc   Tue Feb 20 19:15:26 2024
: /data/data652/coastwatch/oc/L3/scripts/bin/l3cnvtr -r 4 /data/data369/viirs/L3/2024/02/11/V2024042_D1_WW00_chlor_a.nc /data/aftp/socd1/mecb/coastwatch/viirs/science/L3/global/chlora/daily/WW00/V2024042_D1_WW00_chlora.nc
2024-02-22T12:10:26Z (local files)
2024-02-22T12:10:26Z https://oceanwatch.pifsc.noaa.gov/erddap/griddap/noaa_snpp_chla_daily.das";
    String id "L3/2km/infile_2km_G.nc";
    String identifier_product_doi "https://dx.doi.org";
    String identifier_product_doi_authority "https://dx.doi.org";
    String infoUrl "https://coastwatch.noaa.gov";
    String institution "STAR";
    String instrument "VIIRS";
    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, image, imager, imager/radiometer, imaging, infrared, L3, level, level-3, mapped, mass, mass_concentration_of_chlorophyll_a_in_sea_water, national, npp, ocean, ocean color, oceans, optics, orbiting, partnership, polar, polar-orbiting, radiometer, science, sea, seawater, 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 may be redistributed and used without restriction.";
    String map_projection "geographic";
    String measure "Mean";
    String naming_authority "gov.noaa.coastwatch";
    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 89.75625;
    String platform "Suomi-NPP";
    String processing_level "L3 Mapped";
    String processing_version "Unspecified";
    String product_name "V2024042_D1_WW00_chlora.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";
    String Sensor "VIIRS";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.75625;
    String spatialResolution "4.17 km";
    String standard_name_vocabulary "CF Standard Name Table v29";
    String summary "Visible and Infrared Imager/Radiometer Suite/Suomi-NPP (VIIRSN) produced by NOAA/STAR Ocean Color Team through NOAA Multi-Sensor Level 1 to Level 2 processing system (MSL12) using the Ocean Color improved satellite data record. This is daily data, 4-km resolution. More info: https://coastwatch.noaa.gov/cw_html/OceanColor_Science_Quality_VIIRS_SNPP.html";
    String temporal_range "day";
    String testOutOfDate "now-93days";
    String time_coverage_end "2024-02-11T12:00:00Z";
    String time_coverage_start "2012-01-02T12:00:00Z";
    String title "Chlorophyll a Concentration, NPP VIIRS - CoastWatch - Daily, 2012-present";
    Float64 Westernmost_Easting 0.01875000000001137;
  }
}

 

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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