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Dataset Title:  Chlorophyll (OCI), NOAA S-NPP NOAA-20, VIIRS, Near Real-Time, Global 4km, 2019-
present, Daily
  RSS
Institution:  NOAA NESDIS STAR   (Dataset ID: noaacwNPPN20VIIRSchlociDaily)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background | 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:   Ascending: 
 
(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, 1.568376e+9;
    String axis "T";
    String calendar "gregorian";
    String ioos_category "Time";
    String long_name "Time";
    String source_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 {
    Int32 _ChunkSizes 4788;
    String _CoordinateAxisType "Lat";
    Float32 actual_range -89.75626, 89.75625;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String source_name "lat";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 90.0;
    Float32 valid_min -90.0;
  }
  longitude {
    Int32 _ChunkSizes 9600;
    String _CoordinateAxisType "Lon";
    Float32 actual_range -179.9812, 179.9813;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String source_name "lon";
    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";
    String cell_methods "time:mean(interval:1 day)";
    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 "Chlorophyll Concentration, OCI Algorithm";
    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 "2019-09-13T18:25:26.000Z";
    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 "group";
    String creator_url "https://coastwatch.noaa.gov/";
    String cw_orbit_type "ascending/descending";
    String cw_pass_type "day/night";
    String cw_processing_version "NRT NOAA";
    String cw_projection "Geographic";
    String cw_satellite "NPP";
    String cw_sensor "VIIRS";
    String cw_software_name "MSL12";
    Int32 data_bins 6357387;
    Float32 data_maximum 390.7869;
    Float32 data_minimum -1.0;
    String date_created "2019-09-13T18:25:26Z";
    Float64 Easternmost_Easting 179.9813;
    Float32 easternmost_longitude 180.0;
    Int32 end_orbit_number 0;
    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";
    String grid_mapping_name "latitude_longitude";
    String history 
"/data/home001/hgu/docker_v224/bin/l3mapgen par=/data/home001/hgu/docker_v224/bin/../config/l3mapgen_par_chl_oci ifile=/data/home001/hgu/docker_v224/bin/../temp/Config_2019_mixed1/infile_iop_2km_G_chl_oci.nc ofile=/data/data369/viirs/L3/2019/09/12/V2019255_D1_NPP-N20_WW00_chl_oci.nc   Fri Sep 13 18:25:31 2019
: /data/home001/hgu/docker_v224/bin/l3cnvtr -s Suomi-NPP,NOAA-20 /data/data369/viirs/L3/2019/09/12/V2019255_D1_NPP-N20_WW00_chl_oci.nc /data/socd6/coastwatch/mixed_viirs/L3/global/chlora/daily/WW00/V2019255_D1_NPP-N20_WW00_chloci.nc
2019-09-15T08:16:24Z https://coastwatch.noaa.gov/thredds/dodsC/CoastWatch/VIIRS/npp-n20/chloci/DailyGlobal/WW00
2019-09-15T08:16:24Z https://coastwatch.noaa.gov/griddap/noaacwNPPN20VIIRSchlociDaily.das";
    String id "L3//data/data320/L3bin_global/VIIRSMIX/noaa_msl12_nrt/daily/2019/20190912/2km/infile_iop_2km_G_chl_oci_rhw1184_79091.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 "NOAA NESDIS STAR";
    String instrument "VIIRS";
    String keywords "altitude, applications, baseline, center, chlorophyll, data, environmental, graphics, imager, imager/radiometer, imaging, information, infrared, latitude, leaving, longitude, mean, merged, n20, national, nesdis, noaa, NOAA-20, normalized, npp, optical, optical properties, orbiting, overlay, partnership, planes, polar, polar-orbiting, properties, radiance, radiometer, research, satellite, service, suite, time, viirs, visible, water, water-leaving, ww00";
    String keywords_vocabulary "NASA Global Change Master Directory (GCMD) Science Keywords";
    String l2_flag_names "ATMFAIL,LAND,HIGLINT,HILT,HISATZEN,CLOUD,HISOLZEN,LOWLW,NAVWARN,CLDSHDSTL,MAXAERITER,ALGICE,SEAICE,NAVFAIL,FILTER";
    Float32 latitude_step 0.0375;
    String latitude_units "degrees_north";
    String license 
"The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.";
    Float32 longitude_step 0.0375;
    String longitude_units "degrees_east";
    String map_projection "geographic";
    String measure "Mean";
    String Metadata_Conventions "Unidata Dataset Discovery v1.0";
    String naming_authority "gov.noaa.coastwatch";
    Float32 northernmost_latitude 89.775;
    Float64 Northernmost_Northing 89.75625;
    Int32 number_of_columns 9600;
    Int32 number_of_lines 4788;
    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/home001/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/L3/2019/09/12/V2019255_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/home001/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_pversion "Unspecified";
    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 processing_version "Unspecified";
    String product_name "V2019255_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_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";
    Float32 southernmost_latitude -89.775;
    Float64 Southernmost_Northing -89.75626;
    String spatialResolution "4.17 km";
    String standard_name_vocabulary "CF Standard Name Table v29";
    Int32 start_orbit_number 0;
    String suggested_image_scaling_applied "No";
    Float32 suggested_image_scaling_maximum 20.0;
    Float32 suggested_image_scaling_minimum 0.01;
    String suggested_image_scaling_type "LOG";
    String summary "Visible and Infrared Imager/Radiometer Suite/Suomi-NPP NOAA-20 (VIIRS) Level-3 (WW00), Chlorophyll, Global, Daily, processed by NOAA.  EXPERIMENTAL.";
    Float32 sw_point_latitude -89.75625;
    Float32 sw_point_longitude -179.98125;
    String temporal_range "day";
    String testOutOfDate "now-90days";
    String time_coverage_end "2019-09-13T12:00:00Z";
    String time_coverage_start "2019-01-01T12:00:00Z";
    String title "Chlorophyll (OCI), NOAA S-NPP NOAA-20, VIIRS, Near Real-Time, Global 4km, 2019-present,  Daily";
    Float64 Westernmost_Easting -179.9812;
    Float32 westernmost_longitude -180.0;
  }
}

 

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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