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Dataset Title:  Chlorophyll, Blended NOAA-SNPP and NOAA-20 VIIRS, Near Real-Time, Global,
Level 3, 0.0375°, 2019-present EXPERIMENTAL, Daily
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Institution:  NOAA NESDIS STAR   (Dataset ID: nesdisVHNnoaaSNPPnoaa20chlaDaily)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Data Access Form
 
Graph Type:  ?
X Axis:  ?
Y Axis:  ?
Color:  ?
 
Dimensions ?    Start ?    Stop ?
time (UTC) ?     specify just 1 value →
    |< -
< <
altitude (m) ?     specify just 1 value →
   
< <
latitude (degrees_north) ?
    +
    -
< slider >
longitude (degrees_east) ?
    +
    -
< slider >
 
Graph Settings
Color Bar:   Continuity:   Scale: 
   Minimum:   Maximum:   N Sections: 
Draw land mask: 
Y Axis Minimum:   Maximum:   
 
(Please be patient. It may take a while to get the data.)
 
Optional:
Then set the File Type: (File Type information)
and
or view the URL:
(Documentation / Bypass this form ? )
    Click on the map to specify a new center point. ?
Zoom:
[The graph you specified. Please be patient.]

 

Things You Can Do With Your Graphs

Well, you can do anything you want with your graphs, of course. But some things you might not have considered are:

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.546344e+9, 1.5756336e+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";
    Float32 actual_range -89.75626, 89.75625;
    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 {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -179.9812, 179.9813;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max 180.0;
    Float32 valid_min -180.0;
  }
  chl_oci {
    Float32 _FillValue -32767.0;
    String C_format "%.4g";
    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_a_in_sea_water";
    String units "mg m^-3";
    Float32 valid_max 100.0;
    Float32 valid_min 0.001;
  }
  NC_GLOBAL {
    String _lastModified "2019-12-06T18:25:03.000Z";
    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 "2019-12-06T18:25:03.000Z";
    Float64 Easternmost_Easting 179.9813;
    Float64 geospatial_lat_max 89.75625;
    Float64 geospatial_lat_min -89.75626;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.9813;
    Float64 geospatial_lon_min -179.9812;
    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";
    Float32 grid_mapping_inverse_flattening 298.2572;
    Float32 grid_mapping_longitude_of_prime_meridian 0.0;
    String grid_mapping_name "latitude_longitude";
    Float32 grid_mapping_semi_major_axis 6378137.0;
    String history 
"/data/home004/hgu/docker_v224/bin/l3mapgen par=/data/home004/hgu/docker_v224/bin/../config/l3mapgen_par_chl_oci ifile=/data/home004/hgu/docker_v224/bin/../temp/Config_2019_mixed1/infile_iop_2km_G_chl_oci.nc ofile=/data/data369/viirs/L3/2019/12/05/V2019339_D1_NPP-N20_WW00_chl_oci.nc   Fri Dec  6 18:25:09 2019
: /data/home004/hgu/docker_v224/bin/l3cnvtr -s Suomi-NPP,NOAA-20 /data/data369/viirs/L3/2019/12/05/V2019339_D1_NPP-N20_WW00_chl_oci.nc /data/socd6/coastwatch/mixed_viirs/L3/global/chlora/daily/WW00/V2019339_D1_NPP-N20_WW00_chloci.nc
2019-12-08T07:35:30Z https://coastwatch.noaa.gov/thredds/dodsC/CoastWatch/VIIRS/npp-n20/chloci/DailyGlobal/WW00
2019-12-08T07:35:30Z http://coastwatch.pfeg.noaa.gov/griddap/nesdisVHNnoaaSNPPnoaa20chlaDaily.das";
    String id "L3//data/data320/L3bin_global/VIIRSMIX/noaa_msl12_nrt/daily/2019/20191205/2km/infile_iop_2km_G_chl_oci_rhw1184_144323.nc";
    String identifier_product_doi "https://dx.doi.org";
    String identifier_product_doi_authority "https://dx.doi.org";
    String infoUrl "https://coastwatch.noaa.gov/cw/satellite-data-products/ocean-color/near-real-time/viirs.html";
    String institution "NOAA NESDIS STAR";
    String instrument "VIIRS";
    String keywords "algorithm, altitude, chemistry, chl_oci, chlorophyll, color, concentration, data, earth, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, Earth Science > Oceans > Ocean Optics > Ocean Color, image, imager, imager/radiometer, imaging, infrared, L3, latitude, level, level-3, longitude, mapped, mass, mass_concentration_of_chlorophyll_a_in_sea_water, national, npp, ocean, ocean color, oceans, oci, 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, ww00";
    String keywords_vocabulary "GCMD Science Keywords";
    String l2_flag_names "ATMFAIL,LAND,HIGLINT,HILT,HISATZEN,CLOUD,HISOLZEN,LOWLW,NAVWARN,CLDSHDSTL,MAXAERITER,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";
    Float64 Northernmost_Northing 89.75625;
    String platform "Suomi-NPP,NOAA-20";
    String processing_control_input_parameters_apply_pal "yes";
    String processing_control_input_parameters_central_meridian "-999";
    String processing_control_input_parameters_deflate "4";
    String processing_control_input_parameters_east "180.0";
    String processing_control_input_parameters_fudge "1.0";
    String processing_control_input_parameters_ifile "/data/home004/hgu/docker_v224/bin/../temp/Config_2019_mixed1/infile_iop_2km_G_chl_oci.nc";
    String processing_control_input_parameters_interp "nearest";
    String processing_control_input_parameters_north "89.775";
    String processing_control_input_parameters_ofile "/data/data369/viirs/L3/2019/12/05/V2019339_D1_NPP-N20_WW00_chl_oci.nc";
    String processing_control_input_parameters_oformat "netcdf4";
    String processing_control_input_parameters_oformat2 "png";
    String processing_control_input_parameters_palette_dir "$OCDATAROOT/common/palette";
    String processing_control_input_parameters_par "/data/home004/hgu/docker_v224/bin/../config/l3mapgen_par_chl_oci";
    String processing_control_input_parameters_product "chl_oci";
    String processing_control_input_parameters_product_rgb "rhos_671,rhos_551,rhos_486";
    String processing_control_input_parameters_projection "platecarree";
    String processing_control_input_parameters_quiet "false";
    String processing_control_input_parameters_resolution "0.0375deg";
    String processing_control_input_parameters_scale_type "log";
    String processing_control_input_parameters_south "-89.775";
    String processing_control_input_parameters_threshold "0";
    String processing_control_input_parameters_use_quality "yes";
    String processing_control_input_parameters_use_rgb "no";
    String processing_control_input_parameters_west "-180.0";
    String processing_control_l2_flag_names "ATMFAIL,LAND,HIGLINT,HILT,HISATZEN,CLOUD,HISOLZEN,LOWLW,NAVWARN,CLDSHDSTL,MAXAERITER,ALGICE,SEAICE,NAVFAIL,FILTER";
    String processing_control_software_name "l3mapgen";
    String processing_control_software_version "1.0.1-r12992";
    String processing_control_source "infile_iop_2km_G_chl_oci.nc";
    String processing_level "L3 Mapped";
    String product_name "V2019339_D1_NPP-N20_WW00_chloci.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
NOAA-20";
    String Sensor "VIIRS";
    String sourceUrl "https://coastwatch.noaa.gov/thredds/dodsC/CoastWatch/VIIRS/npp-n20/chloci/DailyGlobal/WW00";
    Float64 Southernmost_Northing -89.75626;
    String spatialResolution "4.17 km";
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "Visible and Infrared Imager/Radiometer Suite/Suomi-NPP (VIIRSN) Level-3 Standard Mapped Image (WW00)";
    String temporal_range "day";
    String testOutOfDate "now-5days";
    String time_coverage_end "2019-12-06T12:00:00Z";
    String time_coverage_start "2019-01-01T12:00:00Z";
    String title "Chlorophyll, Blended NOAA-SNPP and NOAA-20 VIIRS, Near Real-Time, Global, Level 3, 0.0375°, 2019-present EXPERIMENTAL, Daily";
    Float64 Westernmost_Easting -179.9812;
  }
}

 

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[(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.


 
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