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Dataset Title:  Chlorophyll, NOAA VIIRS, Near Real-Time, Global, Level 3, 2014-present,
EXPERIMENTAL, Daily
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Institution:  STAR   (Dataset ID: nesdisVHNchlaDaily)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Make a graph
 
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (UTC) ?      311    1 day 4h 38m 43s (uneven)
  < slider >
 altitude (m) ?      1    (just one value)
  < slider >
 latitude (degrees_north) ?      4788    -0.0375 (even)
  < slider >
 longitude (degrees_east) ?      9602    0.0375 (even)
  < slider >
 
Grid Variables (which always also download all of the dimension variables)
 chlor_a (Chlorophyll Concentration, Default 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 1.497528e+9, 1.529496e+9;
    String axis "T";
    String bounds "baseline_bounds";
    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 -89.75625000000002, 89.75625000000001;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -180.01875, 180.01874999999998;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  chlor_a {
    Float32 _FillValue NaN;
    Float64 colorBarMaximum 30.0;
    Float64 colorBarMinimum 0.03;
    String colorBarScale "Log";
    String cw%3aatmospheric_correction "NOAA MECB BMW Atmospheric Correction";
    Int32 cw%3afraction_digits 16;
    String cw%3aprocessing_algorithm "OC3 Algorithm";
    String cw%3aproduct_status "Experimental";
    String grid_mapping "coord_ref";
    String ioos_category "Ocean Color";
    String long_name "Chlorophyll Concentration, Default Algorithm";
    Float32 missing_value NaN;
    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_in_sea_water";
    String units "mg m^-3";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_url "https://coastwatch.noaa.gov";
    String cw%3acwhdf_version "3.1";
    Float64 cw%3aet_affine 0.0, -0.037500000000000006, 0.0375, 0.0, -180.01875, 89.75625000000001;
    Int32 cw%3agctp_datum 12;
    Float64 cw%3agctp_parm 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0;
    Int32 cw%3agctp_sys 0;
    Int32 cw%3agctp_zone 62;
    String cw%3aorbit_type 
"ascending
ascending";
    Int32 cw%3apass_date 17700, 17700;
    String cw%3apass_type 
"day/night
day/night";
    String cw%3aprocessing_version 
"NOAA_MECB_BMW NRT_IDPS
NOAA_MECB_BMW NRT_IDPS";
    String cw%3aprojection "Geographic";
    String cw%3asatellite 
"NPP
NPP";
    String cw%3asensor 
"VIIRS
VIIRS";
    String cw%3asoftware_name 
"MSL12
MSL12";
    String cw%3asoftware_version 
"1.30
1.30";
    Float64 cw%3astart_time 74806.51, 80950.328;
    Int32 cw%3aswath_sync_lines 16, 16;
    Float64 cw%3atemporal_extent 83.0, 83.0;
    String cw%3aviirs_band_naming_convention 
"OBPG
OBPG";
    Float64 Easternmost_Easting 180.01874999999998;
    Float64 geospatial_lat_max 89.75625000000001;
    Float64 geospatial_lat_min -89.75625000000002;
    Float64 geospatial_lat_resolution 0.03750000000000001;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 180.01874999999998;
    Float64 geospatial_lon_min -180.01875;
    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 history 
"[MSL12 1.30] /data/data055/operational/routine/bin/msl12_x64b par=/data/data097/xiaoming.liu/worktmp/MSL20180618/V2018169204643_NPP_NRTNIR.par
NOAA_MECB_BMW NRT_IDPS
SVM01_npp_d20180618_t2046435_e2048076_b34411_c20180618214810545103_nobc_ops.h5,S19461993_COADS_GEOS1.MET_noon,,,S20181690016923_TOVS.OZONE,S20181690016923_TOVS.OZONE,S20181690016923_TOVS.OZONE,radcor_modisa_nocor.hdf,polcor_viirsn_22bands_oc.hdf,landmask_MOD44W.nc,watermask.dat,digital_elevation_map.hdf,ice_mask.hdf,no2_climatology.hdf,alpha510_climatology.hdf,taua865_climatology.hdf,GMTCO_npp_d20180618_t2046435_e2048076_b34411_c20180618215146851233_nobc_ops.h5,
/home/pub/msoracco/aps/aps/aps/share/coastwatch/bin/netcdf_cf_ingest V2018169204643_NPP_NRTNIR_L2.nc /home/pub/msoracco/aps/aps_p/aps/work/VRSVCW.B2018169.204646.hdf
[cwf 3.3.2.259 20161013_100454] cwregister --method=mixed --rectsize=16/16 --overwrite=always South750UW4590Geographic.hdf VRSVCW.B2018169.204646.hdf VRSVCW.B2018169.204646.UW00.mapped00.hdf
/home/pub/msoracco/aps/aps/aps/share/coastwatch/bin/cwfReassemble -j -e edgemask South750UW4590Geographic.hdf VRSVCW.B2018169.204646.UW00.edgemask.hdf VRSVCW.B2018169.204646.UW00.mapped00.hdf VRSVCW.B2018169.204646.UW00.mapped01.hdf
[cwf 3.3.2.259 20161013_100454] cwgraphics VRSVCW.B2018169.204646.UW00.edgemask.hdf
[cwf 3.3.2.259 20161013_100454] cwmath --template graphics --expr commonmask=(and(l2_flags,4650)==0) /home/pub/msoracco/aps/aps_p/browse/lvl3/seadas/coastwatch/hdf/VRSVCW_B2018169_204646_UW00_edgemask_masked.hdf
[cwf 3.3.2.259 20161013_100454] cwmath --template graphics --expr commonmask_nlw=(and(l2_flags,4650)==0) /home/pub/msoracco/aps/aps_p/browse/lvl3/seadas/coastwatch/hdf/VRSVCW_B2018169_204646_UW00_edgemask_masked.hdf
[MSL12 1.30] /data/data055/operational/routine/bin/msl12_x64b par=/data/data097/xiaoming.liu/worktmp/MSL20180618/V2018169222907_NPP_NRTNIR.par
NOAA_MECB_BMW NRT_IDPS
SVM01_npp_d20180618_t2229073_e2230315_b34412_c20180618232634449976_nobc_ops.h5,S19461993_COADS_GEOS1.MET_noon,,,S20181690016923_TOVS.OZONE,S20181690016923_TOVS.OZONE,S20181690016923_TOVS.OZONE,radcor_modisa_nocor.hdf,polcor_viirsn_22bands_oc.hdf,landmask_MOD44W.nc,watermask.dat,digital_elevation_map.hdf,ice_mask.hdf,no2_climatology.hdf,alpha510_climatology.hdf,taua865_climatology.hdf,GMTCO_npp_d20180618_t2229073_e2230315_b34412_c20180618232922298521_nobc_ops.h5,
/home/pub/msoracco/aps/aps/aps/share/coastwatch/bin/netcdf_cf_ingest V2018169222907_NPP_NRTNIR_L2.nc /home/pub/msoracco/aps/aps_n/aps/work/VRSVCW.B2018169.222910.hdf
[cwf 3.3.2.259 20161013_100454] cwregister --method=mixed --rectsize=16/16 --overwrite=always South750UW4590Geographic.hdf VRSVCW.B2018169.222910.hdf VRSVCW.B2018169.222910.UW00.mapped00.hdf
/home/pub/msoracco/aps/aps/aps/share/coastwatch/bin/cwfReassemble -j -e edgemask South750UW4590Geographic.hdf VRSVCW.B2018169.222910.UW00.edgemask.hdf VRSVCW.B2018169.222910.UW00.mapped00.hdf VRSVCW.B2018169.222910.UW00.mapped01.hdf
[cwf 3.3.2.259 20161013_100454] cwgraphics VRSVCW.B2018169.222910.UW00.edgemask.hdf
[cwf 3.3.2.259 20161013_100454] cwmath --template graphics --expr commonmask=(and(l2_flags,4650)==0) /home/pub/msoracco/aps/aps_n/browse/lvl3/seadas/coastwatch/hdf/VRSVCW_B2018169_222910_UW00_edgemask_masked.hdf
[cwf 3.3.2.259 20161013_100454] cwmath --template graphics --expr commonmask_nlw=(and(l2_flags,4650)==0) /home/pub/msoracco/aps/aps_n/browse/lvl3/seadas/coastwatch/hdf/VRSVCW_B2018169_222910_UW00_edgemask_masked.hdf
[cwf 3.3.2.259 20161013_100454] cwcomposite --pedantic --method explicit --inputs - --match ^(longitude|latitude|chlor_a)$ /home/pub/msoracco/aps/aps_n/browse/lvl4/modis/coastwatch/hdf/VRSVCW_B2018169_C2_204646_222910_UW00_edgemask_chlora.hdf
[cwf 3.3.2.259 20161013_100454] cwgraphics /home/pub/msoracco/aps/aps_n/browse/lvl4/modis/coastwatch/hdf/VRSVCW_B2018169_C2_204646_222910_UW00_edgemask_chlora.hdf
[cwf 3.3.2.259 20161013_100454] cwimport --match=^graphics$ --copy /home/pub/msoracco/aps/aps/aps/share/coastwatch/icons/GlobalFourKmGeographic.hdf /home/pub/msoracco/aps/aps_z/browse/lvl4/modis/coastwatch/maskhdf/VRSVCW_B2018169_B2018169_F1_WW00_edgemask_chlora.hdf
2018-06-24T16:20:34Z https://www.star.nesdis.noaa.gov/thredds/dodsC/CoastWatch/VIIRS/chlora/Daily/WW00
2018-06-24T16:20:34Z http://coastwatch.pfeg.noaa.gov/erddap/griddap/nesdisVHNchlaDaily.das";
    String identifier_product_doi_authority "https://dx.doi.org";
    String infoUrl "https://www.star.nesdis.noaa.gov/thredds/dodsC/CoastWatch/VIIRS/chlora/Daily/WW00.html";
    String institution "STAR";
    String keywords "algorithm, altitude, chemistry, chlor_a, chlorophyll, color, concentration, data, default, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, Earth Science > Oceans > Ocean Optics > Ocean Color, imager, imager/radiometer, imaging, infrared, L3, level, level-3, mass, mass_concentration_of_chlorophyll_a_in_sea_water, national, npp, ocean, ocean color, oceans, optics, orbiting, partnership, polar, polar-orbiting, radiometer, sea, seawater, star, suite, suite/suomi-npp, suomi, time, viirs, viirs-n, viirsn, visible, water, ww00";
    String keywords_vocabulary "GCMD Science Keywords";
    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.";
    String naming_authority "gov.noaa.pfeg.coastwatch";
    Float64 Northernmost_Northing 89.75625000000001;
    String OBSERVED_PROPERTY "chlor_a";
    String source "NPP_VIIRS_chlora";
    String sourceUrl "https://www.star.nesdis.noaa.gov/thredds/dodsC/CoastWatch/VIIRS/chlora/Daily/WW00";
    Float64 Southernmost_Northing -89.75625000000002;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "Visible and Infrared Imager/Radiometer Suite/Suomi-NPP (VIIRSN) Level-3 (WW00), Near Real-Time, Chlorophyll, Global, Daily, processed by NOAA. EXPERIMENTAL.";
    String time_coverage_end "2018-06-20T12:00:00Z";
    String time_coverage_start "2017-06-15T12:00:00Z";
    String title "Chlorophyll, NOAA VIIRS, Near Real-Time, Global, Level 3, 2014-present, EXPERIMENTAL, Daily";
    Float64 Westernmost_Easting -180.01875;
  }
}

 

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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