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Dataset Title:  nLw671, NOAA VIIRS, Science Quality, Global, Level 3, 2012-present, Daily Subscribe RSS
Institution:  NOAA NESDIS STAR   (Dataset ID: nesdisVHNSQnLw671Daily)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Make a graph
 
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (Centered Time, UTC) ?      2350    1 day 0h 9m 12s (uneven)
  < slider >
 altitude (m) ?      1    (just one value)
  < slider >
 latitude (degrees_north) ?      4788    -0.0375 (uneven)
  < slider >
 longitude (degrees_east) ?      9600    0.0375 (uneven)
  < slider >
 
Grid Variables (which always also download all of the dimension variables)
 nLw_671 (Normalized water-leaving radiance at 671 nm, W m^-2 um^-1 sr^-1) ?

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 1.3255056e+9, 1.5297552e+9;
    String axis "T";
    String calendar "gregorian";
    String coverage_content_type "coordinate";
    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";
  }
  altitude {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "up";
    Float64 actual_range 0.0, 0.0;
    String axis "Z";
    String coverage_content_type "coordinate";
    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 comment "The latitude values are the centers of the grid cells.";
    String coverage_content_type "coordinate";
    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 comment "The longitude values are the centers of the grid cells.";
    String coverage_content_type "coordinate";
    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;
  }
  nLw_671 {
    Float32 _FillValue -1.777925;
    String cell_methods "time:mean(interval:1 day)";
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String coverage_content_type "physicalMeasurement";
    String grid_mapping "coord_ref";
    String ioos_category "Optical Properties";
    String long_name "Normalized water-leaving radiance at 671 nm";
    String references "Gordon and Wang (1994), Retrieval of water-leaving radiance and aerosol optical thickness over the oceans with SeaWiFS: A preliminary algorithm, Appl. Opt., 33, 443-452";
    String standard_name "normalized_surface_upwelling_radiance_in_air_emerging_from_sea_water";
    String units "W m^-2 um^-1 sr^-1";
    Float32 valid_max 40.0;
    Float32 valid_min -1.499975;
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String comment "This is science quality data.";
    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";
    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";
    String grid_mapping_name "latitude_longitude";
    String history 
"/data/home001/hgu/v224/bin/l3mapgen par=/data/home001/hgu/v224/config/l3mapgen_par_nLw_671 ifile=/data/data320/L3bin_global/VIIRS/noaa_msl12_nrt/daily/2018/20180622/2km/infile_2km_G.nc ofile=/data/data240/viirs/L3/2018/06/22/V2018173_D1_WW00_nLw_671.nc   Sat Jun 23 19:28:55 2018
: /data/home001/hgu/v224/bin/l3cnvtr -v /data/data240/viirs/L3/2018/06/22/V2018173_D1_WW00_nLw_671.nc /data/aftp/socd1/mecb/coastwatch/viirs/science/L3/global/nlw/daily/WW00/V2018173_D1_WW00_nLw671.nc
2018-06-25T08:06:37Z https://www.star.nesdis.noaa.gov/thredds/dodsC/CoastWatch/VIIRS/SCIENCE/nLw671/Daily2/WW00
2018-06-25T08:06:37Z http://coastwatch.pfeg.noaa.gov/erddap/griddap/nesdisVHNSQnLw671Daily.das";
    String id "nesdisVHNSQnLw671Daily";
    String identifier_product_doi "https://dx.doi.org";
    String identifier_product_doi_authority "https://dx.doi.org";
    String infoUrl "https://coastwatch.noaa.gov/cw_html/OceanColor_Science_Quality_VIIRS_SNPP.html";
    String institution "NOAA NESDIS STAR";
    String instrument "VIIRS";
    String keywords "air, altitude, chemistry, chlorophyll, color, daily, data, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, Earth Science > Oceans > Ocean Optics > Ocean Color, emerging, hydrology, image, imager, imager/radiometer, imaging, infrared, L3, latitude, leaving, level, level-3, longitude, mapped, national, nLw_671, normalized, normalized_surface_upwelling_radiance_in_air_emerging_from_sea_water, npp, ocean, oceans, optics, orbiting, partnership, polar, polar-orbiting, radiance, radiometer, sea, seawater, smi, standard, star, suite, suite/suomi-npp, suomi, surface, time, upwelling, viirs, viirs-n, viirsn, visible, water, water-leaving, ww00";
    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 
"https://science.nasa.gov/earth-science/earth-science-data/data-information-policy/
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.

Please acknowledge the use of these data with the following statement: \"These data were provided by NOAA's Center for Satellite Applications & Research (STAR) and the CoastWatch program and distributed by NOAA/NMFS/SWFSC/ERD.\" To reference these data as a citation in a paper, please follow the instructions in the license and at this link: https://coastwatch.pfeg.noaa.gov/erddap/information.html#citeDataset";
    String map_projection "geographic";
    String measure "Mean";
    String naming_authority "gov.noaa.pfeg.coastwatch";
    Float64 Northernmost_Northing 89.75625;
    String platform "Suomi-NPP";
    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/data320/L3bin_global/VIIRS/noaa_msl12_nrt/daily/2018/20180622/2km/infile_2km_G.nc";
    String processing_control_input_parameters_interp "nearest";
    String processing_control_input_parameters_north "89.775";
    String processing_control_input_parameters_ofile "/data/data240/viirs/L3/2018/06/22/V2018173_D1_WW00_nLw_671.nc";
    String processing_control_input_parameters_oformat "netcdf4";
    String processing_control_input_parameters_oformat2 "tiff";
    String processing_control_input_parameters_palette_dir "$OCDATAROOT/common/palette";
    String processing_control_input_parameters_par "/data/home001/hgu/v224/config/l3mapgen_par_nLw_671";
    String processing_control_input_parameters_product "nLw_671";
    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,CHLFAIL,NAVWARN,CLDSHDSTL,MAXAERITER,CHLWARN,ALGICE,SEAICE,NAVFAIL,FILTER";
    String processing_control_software_name "l3mapgen";
    String processing_control_software_version "1.0.1-r12992";
    String processing_control_source "infile_2km_G.nc";
    String processing_level "L3 Mapped";
    String processing_version "Unspecified";
    String product_name "NOAA VIIRS ocean color products from CoastWatch";
    String project "Ocean Color Science Team (NOAA/NESDIS/STAR/OCST)";
    String publisher_email "erd.data@noaa.gov";
    String publisher_name "NOAA NMFS SWFSC ERD";
    String publisher_type "group";
    String publisher_url "https://coastwatch.pfeg.noaa.gov/erddap/";
    String references "Gordon and Wang (1994), Retrieval of water-leaving radiance and aerosol optical thickness over the oceans with SeaWiFS: A preliminary algorithm, Appl. Opt., 33, 443-452";
    String Satellite "SNPP";
    String Sensor "VIIRS";
    String source "Satellite observations from VIIRS ocean color sensor";
    String sourceUrl "https://www.star.nesdis.noaa.gov/thredds/dodsC/CoastWatch/VIIRS/SCIENCE/nLw671/Daily2/WW00";
    Float64 Southernmost_Northing -89.75626;
    String spatialResolution "4.17 km";
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "Level-3 Standard Mapped Image (SMI), Global, 4km, nLw671, Daily composite data from the Visible and Infrared Imager/Radiometer Suite (VIIRS). These are science quality data with a 15-day latency. The data, processed by the NOAA/STAR Ocean Color Team, are produced from MSL12 v1.2 using OC-SDR v04 and were release by CoastWatch as of 2017-08-07. VIIRS is a multi-disciplinary instrument that flies on the Suomi-NPP (National Polar-orbiting Partnership) satellite and is the successor to MODIS. Suomi-NPP is the initial spacecraft in the JPSS (Joint Polar Satellite Systems) series of spacecraft. JPSS is our Nation's next generation polar-orbiting operational environmental satellite system. JPSS is a collaborative program between NOAA and its acquisition agent NASA.";
    String temporal_range "day";
    String time_coverage_end "2018-06-23T12:00:00Z";
    String time_coverage_resolution "PD1";
    String time_coverage_start "2012-01-02T12:00:00Z";
    String title "nLw671, NOAA VIIRS, Science Quality, Global, Level 3, 2012-present, 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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